52639 + Interview Questions in Secondary School in Chemistry

1.	The value of 'R' is in Latm/Kmol-
Answer» The universal gas CONSTANT, R, is 8.31 J / Kmol or 0.0821 Latm / Kmol. 1. DETERMINE the ... Calculate the values of the equilibrium constants KP and Kc for the reaction at 600 K.

Discussion

2.	The causes of acid rain is:a)N2b)NOc)CO2
Answer» The MAIN cause of acid RAIN is.... NO... which is NITRIC OXIDES....

Discussion

3.	Which solid contains more than one kind of bonding?A. IodineB. Silicon dioxideC. Sodium chlorideD. ZincAnswer is A.why?Doesn't SiO2 have permanent dipolar,weak vander waal forces ?
Answer» A IODINE Doesn't SiO2 have PERMANENT dipolar,weak vander WAAL FORCES

Discussion

4.	F, cl, br, i - which has the lowest electronegativity?
Answer» Iodine has lowest electronegativty BCZ down the GROUP ELECTRONEGATIVITY decreases

Discussion

5.	Calculate no of moles of iron in a sample containing 10^22atoms of iron
Answer» 1.38 MOLECULES no of MOLES of IRON in a SAMPLE CONTAINING 10^22atoms of iron

Discussion

6.	7 oxygen gas, o2 , can be converted into ozone, o3 , by passing it through an electric discharge. 3o2 (g) o 2o3 (g) in an experiment, a volume of 300 cm3 of oxygen was used but only 10% of the oxygen was converted into ozone. all volumes were measured at the same temperature and pressure. the total volume of gas present at the end of the experiment, in cm3 , was
Answer» Answer:- $290cm^3$ SOLUTION:- The GIVEN balanced equation is: $3O_2(g)\rightarrow 2O_3(g)$ $300cm^3$ of oxygen was used but only 10% of oxygen converted to ozone. So, the volume of oxygen converted to ozone = $300cm^3(\frac{10}{1000})$ = $30cm^3$ From balanced equation, there is 3:2 RATIO between oxygen and ozone. The volume ratio will also be same as the volumes were measured at the same TEMPERATURE and pressure. Let's multiply the above calculated volume of oxygen by the ratio. $30cm^3O_2(\frac{2cm^3O_3}{3cm^3O_2})$ = $20cm^3O_3$ Remaining volume of oxygen = 300 - 30 = $270cm^3$ Total volume of the gas at the end of the experiment = $270cm^3+20cm^3$ = $290cm^3$ So, at the end of the experiment the volume of the gas present at the end of the experiment was $290cm^3$ .

6.

7 oxygen gas, o2 , can be converted into ozone, o3 , by passing it through an electric discharge. 3o2 (g) o 2o3 (g) in an experiment, a volume of 300 cm3 of oxygen was used but only 10% of the oxygen was converted into ozone. all volumes were measured at the same temperature and pressure. the total volume of gas present at the end of the experiment, in cm3 , was

Answer»

Answer:- $290cm^3$

SOLUTION:- The GIVEN balanced equation is:

$3O_2(g)\rightarrow 2O_3(g)$

$300cm^3$ of oxygen was used but only 10% of oxygen converted to ozone.

So, the volume of oxygen converted to ozone = $300cm^3(\frac{10}{1000})$

= $30cm^3$

From balanced equation, there is 3:2 RATIO between oxygen and ozone. The volume ratio will also be same as the volumes were measured at the same TEMPERATURE and pressure.

Let's multiply the above calculated volume of oxygen by the ratio.

$30cm^3O_2(\frac{2cm^3O_3}{3cm^3O_2})$

= $20cm^3O_3$

Remaining volume of oxygen = 300 - 30 = $270cm^3$

Total volume of the gas at the end of the experiment

= $270cm^3+20cm^3$

= $290cm^3$

So, at the end of the experiment the volume of the gas present at the end of the experiment was $290cm^3$ .

Discussion

7.	A petrol pump owner mixed leaded and unleaded petrol in such a way that the mixture contains 10% unleaded petrol. What quantity of leaded petrol should be added to 1 litre mixture so that the percentage of unleaded petrol becomes 5%? Select one:a. 900mlb. 1800mlc. 100mld. None of these
Answer» 100ML ADDED to 1 LITRE of PETROL

Discussion

8.	How to mix liquid parrafin and vasline to make mosturiser?
Answer» Don't do this it BLOCK the PORES of SKIN ....

Discussion

9.	State the period and group of element with atomic number 109
Answer» ATOMIC no.109 (MEITNERIUM) Periods➡7 Groups➡9

Discussion

10.	How to get clothes back to original color dye to bleach?
Answer» Hii Friend here is ur answer MIX a solution of Persil Bio Washing Powder and the HOTTEST water possible for your fabric.Soak your clothes in this solution for at least 30 minutes up to a few hours.Rinse in HOT or WARM water.Wash as normal in your washing machine.If the dye stain remains, repeat Steps 1 to 3. Hope it helps u ❤❤❤

Discussion

11.	During combustion of unsaturated compounds which flame is seen
Answer» COLOURED(blue or YELLOW) FLAME with a LOT of soots.

Discussion

12.	Name the compound of chlorine which is a disinfectant
Answer» BLEACHING POWDER is the ANSWER

Discussion

13.	Name the compound of chlorine which liberates chlorine on exposure to air
Answer» The COMPOUND is BLEACHING POWDER

Discussion

14.	Which is the reducing agent,substance oxidized,reducing agent and substance reduced in (Mg+H2SO4----------MgSO4+H2)
Answer» REDUCING AGENT mg subs OXIDIZED mg oxidising agent H2 sibs reducedH2

Discussion

15.	Sucrose is shown below. For part (a), select any anomeric carbon atoms. For part (b), determine whether sucrose is a reducing sugar or non-reducing sugar.
Answer» This your question seems to be incomplete but I would like to give you a guide that will DEFINITELY lead you to the answer. Sucrose is a disaccharide made up of two monosaccharides that is glucose and fructose. Glucose is a hexose sugar that is to say that it has six carbon atoms in its structure and fructose is a pentose sugar having five carbon atoms in its structure. These two STRUCTURES combine in a reaction KNOWN as condensation since it involves loss of water molecule. So to DETERMINE anomeric carbon atom is sucrose, you need to determine the carbon atom with hydroxyl group in the equatorial position. This is the preferred structure since its more STABLE.

15.

Sucrose is shown below. For part (a), select any anomeric carbon atoms. For part (b), determine whether sucrose is a reducing sugar or non-reducing sugar.

Answer»

This your question seems to be incomplete but I would like to give you a guide that will DEFINITELY lead you to the answer. Sucrose is a disaccharide made up of two monosaccharides that is glucose and fructose. Glucose is a hexose sugar that is to say that it has six carbon atoms in its structure and fructose is a pentose sugar having five carbon atoms in its structure. These two STRUCTURES combine in a reaction KNOWN as condensation since it involves loss of water molecule.

So to DETERMINE anomeric carbon atom is sucrose, you need to determine the carbon atom with hydroxyl group in the equatorial position. This is the preferred structure since its more STABLE.

Discussion

16.	Draw electron dot strcture of methane and nitrogen
Answer» Methane is CH4 and nitrogen needs to compleat the octet. Methane CONSISTS of single co-valent bonds and nitrogen consists of TRIPLE bonds

16.

Draw electron dot strcture of methane and nitrogen

Answer»

Methane is CH4 and nitrogen needs to compleat the octet.

Methane CONSISTS of single co-valent bonds and nitrogen consists of TRIPLE bonds

Discussion

17.	What is the difference between anhydrous & fused calcium chloride
Answer» Anhydrous and Fused : In theory no difference- both are CACL2. However in practice fused is SOLD with a HIGHER moisture content . Fused CaCl2 is just the hydrate heated up to expel water - this gives the "anhydrous" form. in practice as this so DELIQUESCENT- it takes up moisture.

Discussion

18.	Equivalent weight of bayer's reagent
Answer» We know that in BASIC medium KMNO4 (MN oxidation state=7)converts into MnO2 (Mn oxidation state=4) so change in oxidation is 3. Equivalent weight = MOLECULAR weight÷change in oxidation state Molecular mass of KMnO4=158 Equivalent weight of KMnO4=158÷3=52.66 373 Views hope it will HELP you mark me plz

Discussion

19.	The mass of an electron is 9.1×10^-31 kg. If its kinetic energy is 3.0×10^-25 J, Calculate it's wavelength.NEED CONTENT QUALITY ANSWER
Answer» $\color{red}{Here\:is\:your\: answer}$ ☺☺ ------------------------------------------------------------------ ------------------------------------------------------------------ $Please see the refer attachment$ ------------------------------------------------------------------ ------------------------------------------------------------------ $\color{blue}{Hope\:it\:helps\:you}$ $\color{green}{Thank\:you}$

Discussion

20.	Top 30 element with atomic number
Answer» 1.H --------16. S 2.He ------17.Cl 3.Li --------18.Ar 4.Be -------19.K 5.B --------20. Ca 6.C --------21.Sc 7.N ---------22.Ti 8.O --------23.V 9.F ---------24.Cr 10.N--------25.Mn 11.Na-------26.Fe 12.Mg------27.Co 13.Al--------28.Ni 14.Si--------29 .Cu 15.P---------30.Zn

Discussion

21.	How density of the nucleus constant even its proton changes?
Answer» From that one WOULD ROUGHLY expect the same density when the NUMBER of PROTONS and neutrons PER volume is constant.

Discussion

22.	3. differentiate an atomic orbital from a molecular orbital
Answer» ORBITALS can hold a maximum of TWO electrons. The main DIFFERENCEBETWEEN atomic and molecular orbitalis that the electrons in an atomic ORBITAL are influenced by one positive nucleus, while the electrons of amolecular orbital are influenced by the two or more nuclei depending upon the number of ATOMS in a molecule.

Discussion

23.	How many moles of ferric alum (NH4)2SO4·Fe2(SO4)3·24H2O can be made from the sampleof Fe containing 0.0056 g of it ?[Atomic mass of Fe = 56 u](1) 10–4 mol (2) 0.5 × 10–4 mol(3) 0.33 × 10–4 mol (4) 2 × 10–4 mol
Answer» 112G of Fe is contained in---->1 mole of ferric alum therefore 5.6 * 10^-3g of Fe will be in ----->(1/112)5.610^-3 =====> 0.5 * 10^-4 mol.of ferric alum. The ANS. is (2) 0.5 * 10^-4 Hope it HELPS.

Discussion

24.	At what tempreture does celcius scale reads exactly twice of the faherenit scale??????
Answer» 160 degrees Celsius will equal 320 degrees FAHRENHEIT. At what temperature is the Fahrenheit scale READING equal to TWICE that of the Celsius? -24.6 degrees C = -12.3 degrees F

Discussion

25.	What happens when an acid reacts with base. Give equation of the reaction of the reaction involved. What is the speacial name of this reaction.
Answer» NEUTRALISATION reaction Naoh+Hcl to FORM Nacl+H20

25.

What happens when an acid reacts with base. Give equation of the reaction of the reaction involved. What is the speacial name of this reaction.

Answer»

NEUTRALISATION reaction

Naoh+Hcl to FORM

Nacl+H20

Discussion

26.	What is the difference between intermolecular space and intermolecular distance?
Answer» Intermolecular space is the space between two molecule or atom. In solids it is very LITTLE, in liquids is more the solids but less than liquids and in GASES its the maximum.Intermolecular forces are forces ofattraction or REPULSION which actbetween NEIGHBORING particles (atoms, MOLECULES or ions).

Discussion

27.	Calculate the number of particles in 0.6 moles of oxygen gasclass 9 chemistry atoms and molecules
Answer» 1mole of OXYGEN CONTAINS = 6.022×10^23 PARTICLES 0.6 MOLE will have = 6.22×10^23×0.6=36.132 particles

Discussion

28.	Why does n-butyl bromide have higher b. p. than t-butyl bromide ?
Answer» Because there is HIGHER vanderval FORCE in n-butyl BROMIDE

Discussion

29.	Define f-centre and how it is formed in lattice of crystal
Answer» An F-center, Farbe center or color center (from the original German Farbzentrum; Farbe means color, and ZENTRUM center) is a type of CRYSTALLOGRAPHIC DEFECT in which an anionic vacancy in a crystal is filled by one or more unpaired ELECTRONS. ... Cl− vacancies are generated, because of the excess of NA+.

Discussion

30.	Give reason why gases exert pressure on the walls of container. Gases undergo diffusion very fast
Answer» According to KINETIC THEORY OFGASES , The pressure of the gas is due to CONTINOUS collision of molecules on the WALL of container because the gasmolecule always move in RANDOM motion. Its not limited to gaseverything which has mass EXERT pressure. But the unique property ofgases is that THEY FILL THE SP

Discussion

31.	What is the reason for the stability of intermolecular hydrogen bond and intramolecular hydrogen bonding??
Answer» This causes LESS stability and HIGHER melting and boiling points because the molecules are not really ATTRACTED to each other much and not because the HYDROGEN bonds are weaker. The kinetic energy of molecules follows the Boltzmann distribution. Therefore, at room temperature molecules are CONSTANTLY moving

Discussion

32.	Name the non metallic oxide which cannot be reduced by carbon
Answer» AL2O3..........BCOZ CARBIDE will B FORMED

Discussion

33.	Chemical formual for manganese(ii) reacting with naoh
Answer» The CHEMICAL FORMULA for manganese (ii) REACTING with sodium HYDROXIDE is Mn(NaOH) 2

Discussion

34.	Chemical element with symbol th in atomic number 19
Answer» POTASSIUM is the element WHOSE ATOMIC no. is 19 SYMBOL of potassium is K

Discussion

35.	Please solve this question friends
Answer» Nitric acid is know as AQUA FORTIS HNO3

Discussion

36.	During last phase of photosynthesis what is oxidized and reduced
Answer» LIGHT phace WATER is reduced and the release hydrogen is accepted by NADP , hence is reduced to NADPH2 and SECOND dark face reduced to CO2 with hydrogen

Discussion

37.	Size of particles in suspension colloid and true solutions in different measuring units
Answer» SIZE of PARTICLES in SUSPENSION is more than 100nm, in colloid is between 1-100nm and in true solution is LESS than 1nm.

Discussion

38.	Asymmetric reaction which is kinetically controlled
Answer» Thermodynamic REACTION control or kinetic reaction control in a CHEMICAL reaction ... Asymmetric SYNTHESIS is a field in which the DISTINCTION between kinetic and thermodynamic control ...

Discussion

39.	A temperature which same in celsius and hahrenheit
Answer» just SET ºF = ºC and SOLVE one of the equations. So the temperature when both the Celsius and FAHRENHEIT SCALES are the same is -40 degree

Discussion

40.	Approximately what is value of ph scale considered neutral
Answer» IN PH SCALE 7 is NEUTRAL

Discussion

41.	Difference between °C andC° in chemistry
Answer» ABSOLUTE zero, or 0 K, corresponds to the point at which MOLECULAR energy isat a minimum. ... Because thedifference between the freezing point of water and the boiling point of wateris 100° on both the Celsius and KELVIN scales, the size of a degree Celsius (°C) and a kelvin (K) are precisely the same.

Discussion

42.	What happens when hydrogen reacts with chlorine in (1)diffused sunlight and (2) in direct sunlight
Answer» Hydrogen chloride GAS can also be formed by reaction of moist hydrogengas with CHLORINE in the presence OFTHE diffused sunlight. The presence ofdiffused light is important since the reaction in explosive in direct sunlightand NEGLIGIBLE in dark

Discussion

43.	What happens when hydrogen reacts with chlorine in diffused sunlight
Answer» When HYDROGEN REACTS with CHLORINE to PRODUCE HCL

Discussion

44.	In which temperature does mercury becomes solid in celsius
Answer» Mercury becomes a solid at -38.83 degrees CELSIUS, or -37.89 degrees Fahrenheit. Because mercury REMAINS a LIQUID at EXTREME temperatures, it is OFTEN utilized in thermometers

Discussion

45.	Differentiate between electrovalent and covalent bond answer
Answer» The main difference between electrovalent and COVALENT bond is that electrovalent bond is FORMED when two atoms are in an ELECTROSTATIC attraction WHEREAS covalent bond is formed when two atoms share their ELECTRONS with each other

Discussion

46.	Difference between volatile oil and fixed oil in pharmacognosy
Answer» Here is your ANSWER

Discussion

47.	In a reaction between zinc and Iodine zinc iodide is formed which is being oxidized
Answer» As oxidation means removal of ELECTRON so we can say that, ZINC is being oxidized ZN2+

Discussion

48.	Al2o3 can be converted to anhydrous alcl3 by heating
Answer» AL2O3 may be converted to anhydrous ALCL3 by HEATING of mixture of Al2O3 and carbon in dry CHLORINE.

Discussion

49.	Addition of oxygen and removal of hydrogen is known as
Answer» ADDITION of OXYGEN and REMOVAL of HYDROGEN is OXIDATION.

Discussion

50.	An organic compound a is widely used as a preservative in pickles and has a molecular formula c_2 h_4 o_2 . This compound reacts with ethanol to form a sweet smelling compoundb. identify the compounda. write the chemical equation for its reaction with ethanol to form compoundb. how can we get compound a back fromb. name the process and write the corresponding chemical equation.
Answer» The answe is in the attachment below...........HOPE it HELPS you out ..PLS mark as brainliest

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The value of 'R' is in Latm/Kmol-

The causes of acid rain is:a)N2b)NOc)CO2

Which solid contains more than one kind of bonding?A. IodineB. Silicon dioxideC. Sodium chlorideD. ZincAnswer is A.why?Doesn't SiO2 have permanent dipolar,weak vander waal forces ?

F, cl, br, i - which has the lowest electronegativity?

Calculate no of moles of iron in a sample containing 10^22atoms of iron

A petrol pump owner mixed leaded and unleaded petrol in such a way that the mixture contains 10% unleaded petrol. What quantity of leaded petrol should be added to 1 litre mixture so that the percentage of unleaded petrol becomes 5%? Select one:a. 900mlb. 1800mlc. 100mld. None of these

How to mix liquid parrafin and vasline to make mosturiser?

State the period and group of element with atomic number 109

How to get clothes back to original color dye to bleach?

During combustion of unsaturated compounds which flame is seen

Name the compound of chlorine which is a disinfectant

Name the compound of chlorine which liberates chlorine on exposure to air

Which is the reducing agent,substance oxidized,reducing agent and substance reduced in (Mg+H2SO4----------MgSO4+H2)

Sucrose is shown below. For part (a), select any anomeric carbon atoms. For part (b), determine whether sucrose is a reducing sugar or non-reducing sugar.

Draw electron dot strcture of methane and nitrogen

What is the difference between anhydrous & fused calcium chloride

Equivalent weight of bayer's reagent

The mass of an electron is 9.1×10^-31 kg. If its kinetic energy is 3.0×10^-25 J, Calculate it's wavelength.NEED CONTENT QUALITY ANSWER

Top 30 element with atomic number

How density of the nucleus constant even its proton changes?

3. differentiate an atomic orbital from a molecular orbital

How many moles of ferric alum (NH4)2SO4·Fe2(SO4)3·24H2O can be made from the sampleof Fe containing 0.0056 g of it ?[Atomic mass of Fe = 56 u](1) 10–4 mol (2) 0.5 × 10–4 mol(3) 0.33 × 10–4 mol (4) 2 × 10–4 mol

At what tempreture does celcius scale reads exactly twice of the faherenit scale??????

What happens when an acid reacts with base. Give equation of the reaction of the reaction involved. What is the speacial name of this reaction.

What is the difference between intermolecular space and intermolecular distance?

Calculate the number of particles in 0.6 moles of oxygen gasclass 9 chemistry atoms and molecules

Why does n-butyl bromide have higher b. p. than t-butyl bromide ?

Define f-centre and how it is formed in lattice of crystal

Give reason why gases exert pressure on the walls of container. Gases undergo diffusion very fast

What is the reason for the stability of intermolecular hydrogen bond and intramolecular hydrogen bonding??

Name the non metallic oxide which cannot be reduced by carbon

Chemical formual for manganese(ii) reacting with naoh

Chemical element with symbol th in atomic number 19

Please solve this question friends

During last phase of photosynthesis what is oxidized and reduced

Size of particles in suspension colloid and true solutions in different measuring units

Asymmetric reaction which is kinetically controlled

A temperature which same in celsius and hahrenheit

Approximately what is value of ph scale considered neutral

Difference between °C andC° in chemistry

What happens when hydrogen reacts with chlorine in (1)diffused sunlight and (2) in direct sunlight

What happens when hydrogen reacts with chlorine in diffused sunlight

In which temperature does mercury becomes solid in celsius

Differentiate between electrovalent and covalent bond answer

Difference between volatile oil and fixed oil in pharmacognosy

In a reaction between zinc and Iodine zinc iodide is formed which is being oxidized

Al2o3 can be converted to anhydrous alcl3 by heating

Addition of oxygen and removal of hydrogen is known as