52639 + Interview Questions in Secondary School in Chemistry

1.	An iron ball of mass 0.2 kg is heated to 10 degree celsius and put into a block of ice at 0 degree celsius 25 gram of ice melts if latent heat of fusion of ice is 80 cal /g then specific heat of iron is
Answer» specific heat of iron is 238.095 J/Kg/°C An iron ball of mass , M = 0.2 kg is heated to 10°C and put into a block of ICE at 0°C, m = 25g of ice melts. heat absorbed by iron ball, Q = Ms∆T = 0.2 × s × 10 = 2s ........(1) heat gained by ice to melt it, Q' = mL_f = 25g × 80cal/g = 25 × 80 cal we KNOW, 1 cal = 4.2 Joule so, Q' = 25 × 80/4.2 = 476.19 J heat gained = heat lost ⇒Q = Q' ⇒2s = 476.19 J ⇒s = 476.19/2 = 238.095 J/Kg/°C also read similar questions : 540 grams of ice at zero degree celsius is mixed with 540 gram of water at 80 degree celsius the final temperature of th... brainly.in/question/7715472 30g ice cube at 0 degree Celsius is dropped into 200g of water at 30 degree Celsius. CALCULATE the final temperature of ... brainly.in/question/116622

1.

An iron ball of mass 0.2 kg is heated to 10 degree celsius and put into a block of ice at 0 degree celsius 25 gram of ice melts if latent heat of fusion of ice is 80 cal /g then specific heat of iron is

Answer»

specific heat of iron is 238.095 J/Kg/°C

An iron ball of mass , M = 0.2 kg is heated to 10°C and put into a block of ICE at 0°C, m = 25g of ice melts.

heat absorbed by iron ball, Q = Ms∆T

= 0.2 × s × 10

= 2s ........(1)

heat gained by ice to melt it, Q' = mL_f

= 25g × 80cal/g

= 25 × 80 cal

we KNOW, 1 cal = 4.2 Joule

so, Q' = 25 × 80/4.2 = 476.19 J

heat gained = heat lost

⇒Q = Q'

⇒2s = 476.19 J

⇒s = 476.19/2 = 238.095 J/Kg/°C

also read similar questions : 540 grams of ice at zero degree celsius is mixed with 540 gram of water at 80 degree celsius the final temperature of th...

brainly.in/question/7715472

30g ice cube at 0 degree Celsius is dropped into 200g of water at 30 degree Celsius. CALCULATE the final temperature of ...

brainly.in/question/116622

Discussion

2.	How many number of atoms in in simple cubic unit cell?
Answer» ANSWER: The face-centered CUBIC (fcc) has a coordination number of 12 and contains 4 atoms per unit cell. The body-centered cubic (bcc) has a coordination number of 8 and contains 2 atoms per unit cell. The simple cubic has a coordination number of 6 and contains 1 atom per unit cell. Explanation:

2.

How many number of atoms in in simple cubic unit cell?

Answer»

ANSWER:

The face-centered CUBIC (fcc) has a coordination number of 12 and contains 4 atoms per unit cell. The body-centered cubic (bcc) has a coordination number of 8 and contains 2 atoms per unit cell. The simple cubic has a coordination number of 6 and contains 1 atom per unit cell.

Explanation:

Discussion

3.	How many valence electrons carbon has? Can it lose four electrons? Justify?
Answer» $\huge\bold{HEY:)-}$ ============ ⭐⭐⭐⭐⭐⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ❤❤❤⭐⭐⭐⭐ $\\ \\ \\ \\ \\$ CARBON has FOUR valence electron because it belongs to 14th group

3.

How many valence electrons carbon has? Can it lose four electrons? Justify?

Answer»

$\huge\bold{HEY:)-}$

============

⭐⭐⭐⭐⭐⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ❤❤❤⭐⭐⭐⭐ $\\ \\ \\ \\ \\$

CARBON has FOUR valence electron because it belongs to 14th group

Discussion

4.	Explain the diffusion of copper sulphate in water
Answer» ANSWER: Here's the explanation Explanation: The WHITE solid TURNS blue in the presence of water. The backward reaction is exothermic - energy is TRANSFERRED to the surroundings when it happens. ... When water is added to anhydrous copper sulfate, enough heat is released to make the water bubble and boil. MARKED AS BRAINLIEST

4.

Explain the diffusion of copper sulphate in water

Answer»

ANSWER:

Here's the explanation

Explanation:

The WHITE solid TURNS blue in the presence of water. The backward reaction is exothermic - energy is TRANSFERRED to the surroundings when it happens. ... When water is added to anhydrous copper sulfate, enough heat is released to make the water bubble and boil.

MARKED AS BRAINLIEST

Discussion

5.	a gas with the molecular formula CnH2n+2 diffuse through a porous plug @ one sixth of the rate of diffusion of hydrogen under similar conditions find the value of n
Answer» Answer: The value of N is 5. Explanation: RATE of diffusion of hydrogen gas = r Rate of diffusion of unknown gas = R = $\frac{1}{<klux>6</klux>}r$ r = 6 × R Molar mass of hydrogen gas = 2 g/mol Molar mass of unknown gas = M Graham's Law STATES that the rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows the equation: $\text{Rate of diffusion}\propto \frac{1}{\sqrt{\text{Molar mass of the gas}}}$ So, $\frac{r}{R}=\sqrt{\frac{M}{2 g/mol}}$ $\frac{6R}{R}=\sqrt{\frac{M}{2}}$ $M=\frac{36\times R^2\times 2 g/mol}{R^2}=72 g/mol$ Molar mass of unknown gas, $C_nH_{2n+2}= M = 72g/mol$ $n\times 12 g/mol+1 g/mol(2n+2)=72 g/mol$ n = 5 The value of n is 5.

5.

a gas with the molecular formula CnH2n+2 diffuse through a porous plug @ one sixth of the rate of diffusion of hydrogen under similar conditions find the value of n

Answer»

Answer:

The value of N is 5.

Explanation:

RATE of diffusion of hydrogen gas = r

Rate of diffusion of unknown gas = R = $\frac{1}{<klux>6</klux>}r$

r = 6 × R

Molar mass of hydrogen gas = 2 g/mol

Molar mass of unknown gas = M

Graham's Law STATES that the rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows the equation:

$\text{Rate of diffusion}\propto \frac{1}{\sqrt{\text{Molar mass of the gas}}}$

So, $\frac{r}{R}=\sqrt{\frac{M}{2 g/mol}}$

$\frac{6R}{R}=\sqrt{\frac{M}{2}}$

$M=\frac{36\times R^2\times 2 g/mol}{R^2}=72 g/mol$

Molar mass of unknown gas, $C_nH_{2n+2}= M = 72g/mol$

$n\times 12 g/mol+1 g/mol(2n+2)=72 g/mol$

n = 5

The value of n is 5.

Discussion

6.	How can we liquify atmospheric gases , out of oxygen , nitrogen and carbon dioxide which will liquify easily and why
Answer» Explanation: liquefied ATMOSPHERIC GASE by decreasing pressure and TEMPERATURE NITROGEN because it has lowest melting point

6.

How can we liquify atmospheric gases , out of oxygen , nitrogen and carbon dioxide which will liquify easily and why

Answer»

Explanation:

liquefied ATMOSPHERIC GASE by decreasing pressure and TEMPERATURE

NITROGEN

because it has lowest melting point

Discussion

7.	Sibaji ka rajjo avisekh kab huya tha ??
Answer» Answer: 6 JUNE 1674 KO HUA tha got ITT

7.

Sibaji ka rajjo avisekh kab huya tha ??

Answer»

Answer:

6 JUNE 1674 KO HUA tha

got ITT

Discussion

8.	A student takes some water in a beaker and heats it over a flame for determining its boiling point. He keeps on taking the temperature readings. What would be his observation regarding the temperwture of water from the following?(a) keeps on increasing regularly. (b) keeps on increasing irregularly. (c) first increases slowly, then decreases rapidly and eventually becomes constant. (d) first increases gradually and then becomes constant.
Answer» ANSWER: (d)FIRST INCREASES GRADUALLY and then BECOMES constant Explanation:

8.

A student takes some water in a beaker and heats it over a flame for determining its boiling point. He keeps on taking the temperature readings. What would be his observation regarding the temperwture of water from the following?(a) keeps on increasing regularly. (b) keeps on increasing irregularly. (c) first increases slowly, then decreases rapidly and eventually becomes constant. (d) first increases gradually and then becomes constant.

Answer»

ANSWER:

(d)FIRST INCREASES GRADUALLY and then BECOMES constant

Explanation:

Discussion

9.	Factor of evaporation explain
Answer» ANSWER: The rate of EVAPORATION is affected by the following factors: Temperature: The rate of evaporation increases with an increase in temperature. SURFACE area: The rate of evaporation increases with an increase in surface area. Humidity: The amount of water VAPOUR present in the air is called humidity. The rate of evaporation decreases with an increase in humidity. Wind SPEED: Evaporation increases with an increase in wind speed

9.

Factor of evaporation explain

Answer»

ANSWER:

The rate of EVAPORATION is affected by the following factors:

Temperature: The rate of evaporation increases with an increase in temperature.

SURFACE area: The rate of evaporation increases with an increase in surface area.

Humidity: The amount of water VAPOUR present in the air is called humidity. The rate of evaporation decreases with an increase in humidity.

Wind SPEED: Evaporation increases with an increase in wind speed

Discussion

10.	What is basic difference between protein and enzyme?
Answer» ANSWER: enzymes are made of proteins and FUNCTION as biological catalysts in our BODY ,WHEREAS proteins are made up of amino acids and are not catalysts

10.

What is basic difference between protein and enzyme?

Answer»

ANSWER:

enzymes are made of proteins and FUNCTION as biological catalysts in our BODY ,WHEREAS proteins are made up of amino acids and are not catalysts

Discussion

11.	Does hoffmanns bromamide reaction take place with "imines"
Answer» Answer: An imine (/ɪˈmiːn/ or /ˈɪmɪn/) is a functional group or chemical compound CONTAINING a carbon–nitrogen double bond. The nitrogen atom can be ATTACHED to a hydrogen (H) or an organic group (R). If this group is not a hydrogen atom, then the compound can sometimes be referred to as a Schiff base.[1] The carbon atom has two additional single bonds.[2][3][4] The term "imine" was coined in 1883 by the German chemist Albert Ladenburg.[5] Explanation:

11.

Does hoffmanns bromamide reaction take place with "imines"

Answer»

Answer:

An imine (/ɪˈmiːn/ or /ˈɪmɪn/) is a functional group or chemical compound CONTAINING a carbon–nitrogen double bond. The nitrogen atom can be ATTACHED to a hydrogen (H) or an organic group (R). If this group is not a hydrogen atom, then the compound can sometimes be referred to as a Schiff base.[1] The carbon atom has two additional single bonds.[2][3][4] The term "imine" was coined in 1883 by the German chemist Albert Ladenburg.[5]

Explanation:

Discussion

12.	Does methyl shift occur if carbocation is equally stable
Answer» Explanation: Vinylic carbocations GENERALLY do not REARRANGE, even if they can become more STABLE. For example, the rearrangement shown below does not occur, even though a SECONDARY carbocation would rearrange to become a more stable allylic carbocation (primary with resonance).

12.

Does methyl shift occur if carbocation is equally stable

Answer»

Explanation:

Vinylic carbocations GENERALLY do not REARRANGE, even if they can become more STABLE. For example, the rearrangement shown below does not occur, even though a SECONDARY carbocation would rearrange to become a more stable allylic carbocation (primary with resonance).

Discussion

13.	Does aluminium have higher ionization enthalpy than boron
Answer» <P>Yes, boron has a higher nuclear charge than BERYLLIUM, but the outermost ELECTRON is in a P ORBITAL instead of an S orbital, where the nuclear charge gets screened by the closer S orbital electrons. The same thing happens between aluminum and magnesium. mark as brainlist

13.

Does aluminium have higher ionization enthalpy than boron

Answer»

<P>Yes, boron has a higher nuclear charge than BERYLLIUM, but the outermost ELECTRON is in a P ORBITAL instead of an S orbital, where the nuclear charge gets screened by the closer S orbital electrons. The same thing happens between aluminum and magnesium.

mark as brainlist

Discussion

14.	How many different dipeptides can be formed by two different amino acids?
Answer» Answer: The amino acids can be the same or different. When different, two isomers of the dipeptide are possible, depending on the sequence. Similar descriptions apply to tripeptide (THREE amino acid residues, two peptide BONDS), tetrapeptide, and so on; longer chains are CALLED oligopeptide, polypeptide, protein. Explanation:

14.

How many different dipeptides can be formed by two different amino acids?

Answer»

Answer:

The amino acids can be the same or different. When different, two isomers of the dipeptide are possible, depending on the sequence. Similar descriptions apply to tripeptide (THREE amino acid residues, two peptide BONDS), tetrapeptide, and so on; longer chains are CALLED oligopeptide, polypeptide, protein.

Explanation:

Discussion

15.	Q13 How would you show that the three states of matter are interchangeable?Q14 Under what conditions gases can be liquified? In which form LPG is filled in a gascylinder?Q15 What are the three characteristics of matter?Q16 Why should we wear cotton clothes in summer?017 Why is ice at 273K more effective in cooling than water at the same temperature?Q18 Differentiate between solids, liquids and gases on the basis of any eight properties.Q19 Define evaporation. Write any four factors affecting evaporation.Q20 With the help of an activity,describe sublimation.
Answer» Answer: Answer 13 Explanation: On heating a solid substance and then cooling the VAPOURS finally formed we can show that the three STATES of MATTER are interchangeable. For example, TAKE ice crystals in a beaker and heat. Ice changes into water. On further heating water changes into steam. On cooling, water VAPOUR again changes into water and water to ice. *May it help you*

15.

Q13 How would you show that the three states of matter are interchangeable?Q14 Under what conditions gases can be liquified? In which form LPG is filled in a gascylinder?Q15 What are the three characteristics of matter?Q16 Why should we wear cotton clothes in summer?017 Why is ice at 273K more effective in cooling than water at the same temperature?Q18 Differentiate between solids, liquids and gases on the basis of any eight properties.Q19 Define evaporation. Write any four factors affecting evaporation.Q20 With the help of an activity,describe sublimation.

Answer»

Answer:

Answer 13

Explanation:

On heating a solid substance and then cooling the VAPOURS finally formed we can show that the three STATES of MATTER are interchangeable. For example, TAKE ice crystals in a beaker and heat. Ice changes into water. On further heating water changes into steam. On cooling, water VAPOUR again changes into water and water to ice.

May it help you

Discussion

16.	Describe the Bohr's model of atom
Answer» ANSWER: In 1913 Bohr proposed his quantized shell model of the atom (see Bohr atomic model) to… ... In the Bohr model of the atom, electrons travel in defined circular orbits AROUND the nucleus. The orbits are LABELED by an integer, the quantum number N. Electrons can jump from one ORBIT to another by emitting or absorbing energy. HOPE it helps to you!! plz mark as brainliest answer!!!!

16.

Describe the Bohr's model of atom

Answer»

ANSWER:

In 1913 Bohr proposed his quantized shell model of the atom (see Bohr atomic model) to… ... In the Bohr model of the atom, electrons travel in defined circular orbits AROUND the nucleus. The orbits are LABELED by an integer, the quantum number N. Electrons can jump from one ORBIT to another by emitting or absorbing energy.

HOPE it helps to you!!

plz mark as brainliest answer!!!!

Discussion

17.	Write the main chemical constituents present in perfumes.
Answer» ANSWER: The main constituents is ethyl ALCOHOL which is ADD to perfume UPTO 78%to95% HOPE it will help you Please mark me as brainlist

17.

Write the main chemical constituents present in perfumes.

Answer»

ANSWER:

The main constituents is ethyl ALCOHOL which is ADD to perfume UPTO 78%to95%

HOPE it will help you

Please mark me as brainlist

Discussion

18.	What is the melting point of ice
Answer» ANSWER: At TEMPERATURES above 32°F (0°C), pure water ice melts and changes STATE from a solid to a LIQUID (water); 32°F (0°C) is the melting point. For most substances, the melting and freezing points are about the same temperature. Explanation:

18.

What is the melting point of ice

Answer»

ANSWER:

At TEMPERATURES above 32°F (0°C), pure water ice melts and changes STATE from a solid to a LIQUID (water); 32°F (0°C) is the melting point. For most substances, the melting and freezing points are about the same temperature.

Explanation:

Discussion

19.	What is the melting point of uce
Answer» MELTING POINT of ICE is 0°C

19.

What is the melting point of uce

Answer»

MELTING POINT of ICE is 0°C

Discussion

20.	What is type of colligative properties
Answer» Colligative properties do not depend upon the NATURE of the solute.The four Colligative Properties are stated below: VAPOR pressure depression. Boiling POINT elevation. Melting point depression.

20.

What is type of colligative properties

Answer»

Colligative properties do not depend upon the NATURE of the solute.The four Colligative Properties are stated below: VAPOR pressure depression. Boiling POINT elevation. Melting point depression.

Discussion

21.	A stream of electrons from a heated filament was passed between two charged plates kept at a potential difference V esu. If e and m are charge and mass of an electron, respectively, then the value of h/λ (where λ is wavelength associated with electron wave) is given by:
Answer» ANSWER: EXPLANATION: SOLUTION : λ=hp =h2mE−−−−√ =h2meV−−−−−√ hλ=2meV−−−−−√

21.

A stream of electrons from a heated filament was passed between two charged plates kept at a potential difference V esu. If e and m are charge and mass of an electron, respectively, then the value of h/λ (where λ is wavelength associated with electron wave) is given by:

Answer»

ANSWER:

EXPLANATION:

SOLUTION :

λ=hp

=h2mE−−−−√

=h2meV−−−−−√

hλ=2meV−−−−−√

Discussion

22.	Write the chemicals composition of Tea?
Answer» heys..... tea leaves contain thousands of chemical compounds. When tea leaves are PROCESSED, the chemical compounds within them break down, form COMPLEXES with one another and form NEW compounds. When steeping tea leaves, our senses are tingled by the thousands of volatile compounds rising from the tea liquor and the thousands of non-volatile compounds that are floating within the tea liquor. Because of this, tea is known as the MASTER of chemical diversity.” Much of tea CHEMISTRY from field to cup is yet unknown!

22.

Write the chemicals composition of Tea?

Answer»

heys.....

tea leaves contain thousands of chemical compounds. When tea leaves are PROCESSED, the chemical compounds within them break down, form COMPLEXES with one another and form NEW compounds. When steeping tea leaves, our senses are tingled by the thousands of volatile compounds rising from the tea liquor and the thousands of non-volatile compounds that are floating within the tea liquor. Because of this, tea is known as the MASTER of chemical diversity.” Much of tea CHEMISTRY from field to cup is yet unknown!

Discussion

23.	How is the atmosphere hydrosphere and lithosphere connected?
Answer» ANSWER: I hope this will help you Explanation: These spheres are closely connected. For example, many birds (biosphere) fly through the AIR (atmosphere), while water (hydrosphere) OFTEN FLOWS through the soil (lithosphere). In FACT, the spheres are so closely connected that a change in one sphere often results in a change in one or more of the other spheres.

23.

How is the atmosphere hydrosphere and lithosphere connected?

Answer»

ANSWER:

I hope this will help you

Explanation:

These spheres are closely connected. For example, many birds (biosphere) fly through the AIR (atmosphere), while water (hydrosphere) OFTEN FLOWS through the soil (lithosphere). In FACT, the spheres are so closely connected that a change in one sphere often results in a change in one or more of the other spheres.

Discussion

24.	18 g of glucose is dissolved in 1 kg of water in a saucepan
Answer» Answer: 373.202 K Explanation: Moles of glucose= 18 G /180 g MOL -1 =0.1mol No of kilograms of solvent =1 kg Thus molality of glucose solution = 0.1mol kg -1 For water , change in BOILING POINT ATb = Kb * m = 0.52 K kg mol -1 * 0.1 mol kg-1= 0.052 K Since water boils at 373.15 K at 1.013 bar pressure , therefore,the boiling point of solution will be 373.15 + 0.052 = 373.202 K.

24.

18 g of glucose is dissolved in 1 kg of water in a saucepan

Answer»

Answer:

373.202 K

Explanation:

Moles of glucose= 18 G /180 g MOL -1 =0.1mol

No of kilograms of solvent =1 kg

Thus molality of glucose solution = 0.1mol kg -1

For water , change in BOILING POINT

ATb = Kb * m = 0.52 K kg mol -1 * 0.1 mol kg-1= 0.052 K

Since water boils at 373.15 K at 1.013 bar pressure , therefore,the boiling point of solution will be 373.15 + 0.052 = 373.202 K.

Discussion

25.	Exceptions of general trend of atomic radius
Answer» ANSWER: Explanation: 6.8 *10ki POWER -8 is the answer

25.

Exceptions of general trend of atomic radius

Answer»

ANSWER:

Explanation:

6.8 *10ki POWER -8 is the answer

Discussion

26.	(1) 104 (2) 137 (3768.5 (4)6.85ATOMIC WEIGHTOne gram of hydrogen is heated to combine wit80 grams of bromine. 0.6 gm of a metal (varend2) combines with 4 grams bromine. The atomweight of metal is(1) 82 1 2) 24 10 to 14762A metal M (atomic weight 193.5) forms a chloridwhich contains 35.5% chlorine. The moleculaformula of the chloride of metal M is:(1) MCI (2) MC12 (3) MC12 - (4) MC14
Answer» ANSWER: gjkhhdjkekekkkfkfkktkrkkemmdmd

26.

(1) 104 (2) 137 (3768.5 (4)6.85ATOMIC WEIGHTOne gram of hydrogen is heated to combine wit80 grams of bromine. 0.6 gm of a metal (varend2) combines with 4 grams bromine. The atomweight of metal is(1) 82 1 2) 24 10 to 14762A metal M (atomic weight 193.5) forms a chloridwhich contains 35.5% chlorine. The moleculaformula of the chloride of metal M is:(1) MCI (2) MC12 (3) MC12 - (4) MC14

Answer»

ANSWER:

gjkhhdjkekekkkfkfkktkrkkemmdmd

Discussion

27.	Configuration of R and S
Answer» ANSWER: S- (2,8,6) HOPE this will HELP U

27.

Configuration of R and S

Answer»

ANSWER:

S- (2,8,6)

HOPE this will HELP U

Discussion

28.	The boiling point of water is 100c express this in Kelvin and Fahrenheit scale
Answer» Answer: 180°F and 375K Explanation:

28.

The boiling point of water is 100c express this in Kelvin and Fahrenheit scale

Answer»

Answer:

180°F and 375K

Explanation:

Discussion

29.	Dilute sulphuric acid is added to barium chloride solution
Answer» Answer: Explanation: When barium chloride REACTS withsulphuric acid, an insoluble white precipitate of barium sulphate is formed. ... Barium chloride (BaCl2) WILLNOT react with HCl since both have the same ANION Cl- hence no REACTION. However in case of H2SO4, a white ppt of BaSO4 may be seen.

29.

Dilute sulphuric acid is added to barium chloride solution

Answer»

Answer:

Explanation:

When barium chloride REACTS withsulphuric acid, an insoluble white precipitate of barium sulphate is formed. ... Barium chloride (BaCl2) WILLNOT react with HCl since both have the same ANION Cl- hence no REACTION. However in case of H2SO4, a white ppt of BaSO4 may be seen.

Discussion

30.	Difference between white phosphorus and red phosphorus
Answer» Answer: Main differences between the properties of white phosphorus and RED phosphorus. It is a soft and WAXY SOLID. It possesses a garlic smell. In both solid and vapour states, it EXISTS as a P4 MOLECULE.

30.

Difference between white phosphorus and red phosphorus

Answer»

Answer:

Main differences between the properties of white phosphorus and RED phosphorus. It is a soft and WAXY SOLID. It possesses a garlic smell. In both solid and vapour states, it EXISTS as a P4 MOLECULE.

Discussion

31.	How does the electronic configuration of an atom be defined?
Answer» Answer: ELECTRONS are arranged in different shells AROUND tje nucleus of the atom of an ELEMENT. The ARRANGEMENT of electrons in different orbits or shells around the nucleus of atom is called ELECTRONIC configuration.

31.

How does the electronic configuration of an atom be defined?

Answer»

Answer:

ELECTRONS are arranged in different shells AROUND tje nucleus of the atom of an ELEMENT. The ARRANGEMENT of electrons in different orbits or shells around the nucleus of atom is called ELECTRONIC configuration.

Discussion

32.	General precautions involved in gravimetric analysis
Answer» Answer: method of QUANTITATIVE ANALYSIS in which any ELEMENT or COMPOUND gets precipitated from its solution by using SUITABLE reagent. Methods of gravimetric analysis Precipitation methods Electrogravimetry Thermogravimetry volatilization methods Explanation:

32.

General precautions involved in gravimetric analysis

Answer»

Answer:

method of QUANTITATIVE ANALYSIS in which any ELEMENT or COMPOUND gets precipitated from its solution by using SUITABLE reagent.

Methods of gravimetric analysis

Precipitation methods

Electrogravimetry

Thermogravimetry

volatilization methods

Explanation:

Discussion

33.	What are the different classified atomspheic levels to measure air pollution?
Answer» Explanation: POLLUTION: Gaseous pollutants: Oxides of carbon, nitrogen and sulphur. PARTICULATE matter: Fine METAL dust, fly ash, soot, cotton dust and RADIOACTIVE substances.

33.

What are the different classified atomspheic levels to measure air pollution?

Answer»

Explanation:

POLLUTION: Gaseous pollutants: Oxides of carbon, nitrogen and sulphur. PARTICULATE matter: Fine METAL dust, fly ash, soot, cotton dust and RADIOACTIVE substances.

Discussion

34.	What do you mean by change of state? how can the physical state of matter be changed?
Answer» ANSWER: change of state means that changing SUBSTANCE from ONE state to another. physical state of MATTER can be changed by interconversion of water as ice is changed into water and water into VAPOUR and its vice versa

34.

What do you mean by change of state? how can the physical state of matter be changed?

Answer»

ANSWER:

change of state means that changing SUBSTANCE from ONE state to another.

physical state of MATTER can be changed by interconversion of water as

ice is changed into water and water into VAPOUR and its vice versa

Discussion

35.	Why coal is regarded as a mixture not a pure why coal is regarded as a mixture not a pure substance. Explain
Answer» Answer: coal is regarded as MIXTURE because it is mixed with MANY types of gases such as hydrogen, CARBON, NITROGEN, sulphur etc.

35.

Why coal is regarded as a mixture not a pure why coal is regarded as a mixture not a pure substance. Explain

Answer»

Answer:

coal is regarded as MIXTURE because it is mixed with MANY types of gases such as hydrogen, CARBON, NITROGEN, sulphur etc.

Discussion

36.	Difference between renwable and non renwable 0 ch 16
Answer» Answer: RENEWABLE SOURCES ARE UNLIMITED SOURCES LIKE SUN,WIND ETC NON RENEWABLE SOURCES ARE LIMITED SOURCES LIKE COAL, BIOGAS ETC Explanation:

36.

Difference between renwable and non renwable 0 ch 16

Answer»

Answer:

RENEWABLE SOURCES ARE UNLIMITED SOURCES LIKE SUN,WIND ETC

NON RENEWABLE SOURCES ARE LIMITED SOURCES LIKE COAL, BIOGAS ETC

Explanation:

Discussion

37.	How is Fahrenheit degrees related to Celsius degree
Answer» ANSWER:HOPE it HELPS U... EXPLANATION:

37.

How is Fahrenheit degrees related to Celsius degree

Answer»

ANSWER:HOPE it HELPS U...

EXPLANATION:

Discussion

38.	Difference between two electrode and three electrode system
Answer» EXPLANATION: In two-ELECTRODE SYSTEM, you in fact use the counter electrode as reference electrode. unlike the reference electrode, the POTENTIAL of counter electrode changes during your measurement. that is the reason you got different RESULTS. ... For a small scale characterization study, a three-electrode system is good.

38.

Difference between two electrode and three electrode system

Answer»

EXPLANATION:

In two-ELECTRODE SYSTEM, you in fact use the counter electrode as reference electrode. unlike the reference electrode, the POTENTIAL of counter electrode changes during your measurement. that is the reason you got different RESULTS. ... For a small scale characterization study, a three-electrode system is good.

Discussion

39.	Explain the shape of nh3 molecule according to vsepr theory
Answer» Answer: Ammonia has 4 regions of electron density around the CENTRAL nitrogen atom (3 bonds and one lone PAIR). These are arranged in a tetrahedral shape. The resulting molecular shape is TRIGONAL pyramidal with H-N-H angles of 106.7°.

39.

Explain the shape of nh3 molecule according to vsepr theory

Answer»

Answer:

Ammonia has 4 regions of electron density around the CENTRAL nitrogen atom (3 bonds and one lone PAIR).

These are arranged in a tetrahedral shape. The resulting molecular shape is TRIGONAL pyramidal with H-N-H angles of 106.7°.

Discussion

40.	Hoffmann bromamide degradation reaction is shown by
Answer» ANSWER: EXPLANATION: QUESTION is WRONG so it will be not CLEAR

40.

Hoffmann bromamide degradation reaction is shown by

Answer»

ANSWER:

EXPLANATION:

QUESTION is WRONG so it will be not CLEAR

Discussion

41.	what is peroxide linkage?? how to know if a compound is having peroxide linkage...notebook ans . with an example
Answer» Answer: A peroxide linkage is simply a O − O bond. Explanation: Hydrogen peroxide is simply H − O − O − H , H 2 O 2 . The oxygen-oxygen bond is quite weak, and the bond can homolyze as shown: H 2 O 2 → 2 H O ⋅ Given our DEFINITION of OXIDATION numbers, the oxidation number of O in peroxide is necessarily − I . The hydroxyl radical H O ⋅ is NEUTRAL and is very REACTIVE.

41.

what is peroxide linkage?? how to know if a compound is having peroxide linkage...notebook ans . with an example

Answer»

Answer:

A peroxide linkage is simply a

O

−

O

bond.

Explanation:

Hydrogen peroxide is simply

H

−

O

−

O

−

H

,

H

2

O

2

.

The oxygen-oxygen bond is quite weak, and the bond can homolyze as shown:

H

2

O

2

→

2

H

O

⋅

Given our DEFINITION of OXIDATION numbers, the oxidation number of

O

in peroxide is necessarily

−

I

.

The hydroxyl radical

H

O

⋅

is NEUTRAL and is very REACTIVE.

Discussion

42.	What is the formulas of nosadarFormula of baking soda
Answer» ANSWER: nahco3 Explanation: SODIUM HYDROGEN CARBONATE

42.

What is the formulas of nosadarFormula of baking soda

Answer»

ANSWER:

nahco3

Explanation:

SODIUM HYDROGEN CARBONATE

Discussion

43.	The actual mass of a molecule of carbon dioxide is
Answer» $7.30\times 10^{-23}$ Answer : The actual mass of a molecule of CARBON dioxide is, gram. Explanation : According to AVOGADRO's law, 1 mole of EVERY substance weighs equal to the molecular mass and contains Avogadro's number $6.023\times 10^{23}$ of particles. To calculate the moles, we use the EQUATION: $\text{Number of moles}=\frac{\text{Given molecules}}{\text {Avogadro's number}}$ $\text{Number of moles}=\frac{1}{6.023\times 10^{23}}=0.17\times 10^{-23}moles$ As, 1 mole of $CO_2$ molecule weighs = 44 g $0.17\times 10^{-23}$ moles of $CO_2$ molecule weighs = $\frac{44}{1}\times 0.17\times 10^{-23}=7.30\times 10^{-23}g$ $7.30\times 10^{-23}$ Therefore, the mass of a molecule of carbon dioxide is, gram.

43.

The actual mass of a molecule of carbon dioxide is

Answer»

$7.30\times 10^{-23}$ Answer : The actual mass of a molecule of CARBON dioxide is, gram.

Explanation :

According to AVOGADRO's law, 1 mole of EVERY substance weighs equal to the molecular mass and contains Avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the moles, we use the EQUATION:

$\text{Number of moles}=\frac{\text{Given molecules}}{\text {Avogadro's number}}$

$\text{Number of moles}=\frac{1}{6.023\times 10^{23}}=0.17\times 10^{-23}moles$

As, 1 mole of $CO_2$ molecule weighs = 44 g

$0.17\times 10^{-23}$ moles of $CO_2$ molecule weighs = $\frac{44}{1}\times 0.17\times 10^{-23}=7.30\times 10^{-23}g$

$7.30\times 10^{-23}$ Therefore, the mass of a molecule of carbon dioxide is, gram.

Discussion

44.	How to know maximum no. of bonds in an atom
Answer» ANSWER: YOU CAN FIND IT THROUGH IT'S VALENCY OR ELECTRONIC CONFIGURATION EXPLANATION:

44.

How to know maximum no. of bonds in an atom

Answer»

ANSWER:

YOU CAN FIND IT THROUGH IT'S VALENCY OR ELECTRONIC CONFIGURATION

EXPLANATION:

Discussion

45.	prepare a project on the utilisation of renewable source of energy with labelled a diagram.pls answer me fast
Answer» you can FIND internet ALSO renewable SOURCES of ENERGY LEVEL diagram with all the information about this

Discussion

46.	What will s203 will be converted into on reduction
Answer» Answer: The oxidizing agent is I 2 . Explanation: A quick technique to use here would be to look at the fact that you're going from iodine, I 2 , on the reactants' side to the iodide anion, I − , on the products' side. In this case, you're going from a NEUTRAL molecule to a negatively charged ion, so right from the start, you know that iodine is being reduced, i.e. it is taking in electrons. This can only mean that the thiosulfate anion, S2O2−3 , is acting as a reducing agent because it is reducing iodine to iodide anions. Consequently, you can say that iodine, I 2 , is acting as an oxidizng agent because it is oxidizing the thiosulfate anion to the TETRATHIONATE anion, S4O2−6 .S2O2−3→reduces I2+gets oxidzied to S4O2−6I2→oxidizes S2O2−3+gets reduced to I− You can see that this is the case by assigning oxidation numbers to the atoms that take part in the reaction--I won't add the states to keep the chemical equation simpleyNotice that the oxidation number of iodine goes from 0 on the reactants' side to − 1 on the products' side. This tells you that iodine is being reduced because its oxidation number is decreasing. Similarly, the oxidation number of SULFUR goes from + 2 on the reactants' side to an average value of + 5/2 on the products' side. This tells you that sulfur is being oxidized because its oxidation number is increasing. So once again, you can CONCLUDE that iodine isdecreasing. Similarly, the oxidation number of sulfur goes from + 2 on the reactants' side to an average value of + 5/2 on the products' side. This tells you that sulfur is being oxidized because its oxidation number is increasing. So once again, you can conclude that iodine is the oxidizing agent because it oxidizes the thiosulfate anions to the tetrathionate anions while being reduced to the iodide anions. Similarly, the thiosulfate anion is the reducing agent because it reduces iodine to the iodide anions while being oxidized to the tetrathionate anions.

46.

What will s203 will be converted into on reduction

Answer»

Answer:

The oxidizing agent is

I

2

.

Explanation:

A quick technique to use here would be to look at the fact that you're going from iodine,

I

2

, on the reactants' side to the iodide anion,

I

−

, on the products' side.

In this case, you're going from a NEUTRAL molecule to a negatively charged ion, so right from the start, you know that iodine is being reduced, i.e. it is taking in electrons.

This can only mean that the thiosulfate anion,

S2O2−3

, is acting as a reducing agent because it is reducing iodine to iodide anions.

Consequently, you can say that iodine,

I

2

, is acting as an oxidizng agent because it is oxidizing the thiosulfate anion to the TETRATHIONATE anion,

S4O2−6 .S2O2−3→reduces I2+gets oxidzied to S4O2−6I2→oxidizes S2O2−3+gets reduced to I−

You can see that this is the case by assigning oxidation numbers to the atoms that take part in the reaction--I won't add the states to keep the chemical equation simpleyNotice that the oxidation number of iodine goes from

0

on the reactants' side to

−

1

on the products' side. This tells you that iodine is being reduced because its oxidation number is decreasing.

Similarly, the oxidation number of SULFUR goes from

+

2

on the reactants' side to an average value of

+

5/2

on the products' side. This tells you that sulfur is being oxidized because its oxidation number is increasing.

So once again, you can CONCLUDE that iodine isdecreasing.

Similarly, the oxidation number of sulfur goes from

+

2

on the reactants' side to an average value of

+

5/2

on the products' side. This tells you that sulfur is being oxidized because its oxidation number is increasing.

So once again, you can conclude that iodine is the oxidizing agent because it oxidizes the thiosulfate anions to the tetrathionate anions while being reduced to the iodide anions.

Similarly, the thiosulfate anion is the reducing agent because it reduces iodine to the iodide anions while being oxidized to the tetrathionate anions.

Discussion

47.	How to derive the element with its symbol and valency?
Answer» Explanation: Basically there is no way by which you can derive an ELEMENT from a SYMBOL. The symbols are usually learned. And for valency, it can tell the group NUMBER but not the EXACT element.

47.

How to derive the element with its symbol and valency?

Answer»

Explanation:

Basically there is no way by which you can derive an ELEMENT from a SYMBOL. The symbols are usually learned.

And for valency, it can tell the group NUMBER but not the EXACT element.

Discussion

48.	copper sulphate on treatment with potassium iodide precipitate cuprous iodide liberates iodine gas and also forms Potassium Sulphate
Answer» hey mate here is your answer ❤️❤️❤️❤️ 1. Magnesium will react with following :- zinc sulphate, COPPER sulphate and IRON sulphate. 2. Zinc will react with following :- copper sulphate, iron sulphate 3. Iron will react with following :- copper sulphate only. 4. POTASSIUM salt will not react with any of these. mark me as brainlist ❤️ ❤️❤️

48.

copper sulphate on treatment with potassium iodide precipitate cuprous iodide liberates iodine gas and also forms Potassium Sulphate

Answer»

hey mate here is your answer ❤️❤️❤️❤️

1. Magnesium will react with following :-

zinc sulphate, COPPER sulphate and IRON sulphate.

2. Zinc will react with following :-

copper sulphate, iron sulphate

3. Iron will react with following :-

copper sulphate only.

4. POTASSIUM salt will not react with any of these.

mark me as brainlist ❤️ ❤️❤️

Discussion

49.	In the following reaction ÷ Pbo + c - Pb + Co ...............a. pbo is oxidised b. c acts as an oxidizing agent c. c acts as a reducing agent d. reaction does not represent redox reaction
Answer» ANSWER: C) C acts as a REDUCING agent Explanation: because C removes oxygen from PbO.

49.

In the following reaction ÷ Pbo + c - Pb + Co ...............a. pbo is oxidised b. c acts as an oxidizing agent c. c acts as a reducing agent d. reaction does not represent redox reaction

Answer»

ANSWER:

C) C acts as a REDUCING agent

Explanation:

because C removes oxygen from PbO.

Discussion

50.	Difference between lattice enthalpy and bond enthalpy
Answer» EXPLANATION: lactice ENERY is very different from bond one Electric field LINES due to varying magnetic field

50.

Difference between lattice enthalpy and bond enthalpy

Answer»

EXPLANATION:

lactice ENERY is very different from bond one

Electric field LINES due to varying magnetic field

Discussion

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hey mate here is your answer ❤️❤️❤️❤️

1. Magnesium will react with following :-

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2. Zinc will react with following :-

copper sulphate, iron sulphate

3. Iron will react with following :-

copper sulphate only.

4. POTASSIUM salt will not react with any of these.

mark me as brainlist ❤️ ❤️❤️

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