52639 + Interview Questions in Secondary School in Chemistry

1.	Find the ratio of energies of 2nd and 3rd orbit of He+ and Li2+ respectively.
Answer» Answer: 1:1 Explanation: LISTEN E=-kz^2 ÷n^2 For finding ratio we just have to DEVIDE, the respective atomic and orbit number asked and use the above formula we GET :(z1÷z2) ^2 ÷(n1÷n2) ^2 (2÷3)^2 ×(3÷2) ^2 THEREFORE answer is 1:1 IF you like my answer then please brainliest it :)

1.

Find the ratio of energies of 2nd and 3rd orbit of He+ and Li2+ respectively.

Answer»

Answer:

1:1

Explanation:

LISTEN E=-kz^2 ÷n^2

For finding ratio we just have to DEVIDE, the respective atomic and orbit number asked and use the above formula we GET :(z1÷z2) ^2 ÷(n1÷n2) ^2

(2÷3)^2 ×(3÷2) ^2

THEREFORE answer is 1:1

IF you like my answer then please brainliest it :)

Discussion

2.	What do u understand by fakeness ??
Answer» ANSWER: FAKENESS REFERS to the WRONG information about anything

2.

What do u understand by fakeness ??

Answer»

ANSWER:

FAKENESS REFERS to the WRONG information about anything

Discussion

3.	Why baking soda is used in soda acid fire extinguisher? ?
Answer» ANSWER: yes it is used as fire extinguisher Explanation: because it contains SODIUM hydrogen CARBONATE on decomposition it releases CARBONDIOXIDE which putts of the FLAME

3.

Why baking soda is used in soda acid fire extinguisher? ?

Answer»

ANSWER:

yes it is used as fire extinguisher

Explanation:

because it contains SODIUM hydrogen CARBONATE on decomposition it releases CARBONDIOXIDE which putts of the FLAME

Discussion

4.	How natural indigator and all factory indigator behaves in acid and base
Answer» ANSWER: L can't GIVE your answer hope you understand me

4.

How natural indigator and all factory indigator behaves in acid and base

Answer»

ANSWER:

L can't GIVE your answer hope you understand me

Discussion

5.	2.3 gram of metallic sodium react with excess of water.calculate the mass of the Sodium Hydroxide formed.what is the volume of hydrogen evolved at NTP
Answer» ANSWER: NTP is .......OK ok ok ok

5.

2.3 gram of metallic sodium react with excess of water.calculate the mass of the Sodium Hydroxide formed.what is the volume of hydrogen evolved at NTP

Answer»

ANSWER:

NTP is .......OK ok ok ok

Discussion

6.	Atomicity of hydrogen iodide
Answer» Each hydrogen atom has one ELECTRON to GAIN STABILITY it has to gain another electron

Discussion

7.	From 200mg of Co2 when X molecules are removed, 2.89*10-3 moles of CO2 are left. X will be
Answer» ANSWER: Explanation: 2

7.

From 200mg of Co2 when X molecules are removed, 2.89*10-3 moles of CO2 are left. X will be

Answer»

ANSWER:

Explanation:

2

Discussion

8.	Melting point of three solid a,b and c are respectively 300k,290k. Arrange these in order of increasing strength of interparticle forces.
Answer» ANSWER: a>b Explanation: Melting POINT is the temperature at which SOLID becomes LIQUID Higher the FORCE of attraction .Higher energy will be neded to convert it into liquid. so higher the temmperature.

8.

Melting point of three solid a,b and c are respectively 300k,290k. Arrange these in order of increasing strength of interparticle forces.

Answer»

ANSWER:

a>b

Explanation:

Melting POINT is the temperature at which SOLID becomes LIQUID

Higher the FORCE of attraction .Higher energy will be neded to convert it into liquid. so higher the temmperature.

Discussion

9.	At constan temprature, in agiven mass of an ideal gas
Answer» ANSWER: USE the BOYLES LAW or CHARLES law

9.

At constan temprature, in agiven mass of an ideal gas

Answer»

ANSWER:

USE the BOYLES LAW or CHARLES law

Discussion

10.	Water is a compound and not a mixture . List two reasons to justify your answer
Answer» Answer: Because it have two ELEMENTS ..... and other REASON is that it DISSOLVES ANYTHING in it....

10.

Water is a compound and not a mixture . List two reasons to justify your answer

Answer»

Answer:

Because it have two ELEMENTS ..... and other REASON is that it DISSOLVES ANYTHING in it....

Discussion

11.	Describe the process of weaving
Answer» Answer: weaving is a processof converting WRAP and weft yarns into a frabic and INTERLACEMENT of two yarns. Explanation: weaving is done on a loom and CONSISTS of three PRIMARY motions. Is it helpful to u ?

11.

Describe the process of weaving

Answer»

Answer:

weaving is a processof converting WRAP and weft yarns into a frabic and INTERLACEMENT of two yarns.

Explanation:

weaving is done on a loom and CONSISTS of three PRIMARY motions.

Is it helpful to u ?

Discussion

12.	Name any two salt sloutions which on mixing together can produce a precipitate of salt silverchloride
Answer» INSTEAD of TWO salts there can be ONE BASE and one acid to form a precipitate of silver Chloride and those are NaOH and AGCL.

12.

Name any two salt sloutions which on mixing together can produce a precipitate of salt silverchloride

Answer»

INSTEAD of TWO salts there can be ONE BASE and one acid to form a precipitate of silver Chloride and those are NaOH and AGCL.

Discussion

13.	The largest and most abundant cells of connective tissue
Answer» ANSWER: FIBROBLAST is largest and most ABUNDANT cells of connective TISSUE

13.

The largest and most abundant cells of connective tissue

Answer»

ANSWER:

FIBROBLAST is largest and most ABUNDANT cells of connective TISSUE

Discussion

14.	Nickel ke do ayask bataye
Answer» Answer: incomplete QUESTION u have ASK MENTAL

14.

Nickel ke do ayask bataye

Answer»

Answer:

incomplete QUESTION u have ASK MENTAL

Discussion

15.	a white colour powder is used by doctors for supporting fractured bone write chemical name and formula of the powder when this white powder is mixed with water a hard solid mass is Octane write balanced chemical equation for the change explain the reaction of the dilute hydrochloric acid on the following with chemical equation for magnesium ribbon second Sodium Hydroxide 3rd Cross eggshells write the chemical formula of hydrated copper sulphate and any hydrous copper sulphate giving an activity to illustrate how these are enter convertible
Answer» ANSWER: the WHITE COLOUR is plaster of Paris according to me

15.

a white colour powder is used by doctors for supporting fractured bone write chemical name and formula of the powder when this white powder is mixed with water a hard solid mass is Octane write balanced chemical equation for the change explain the reaction of the dilute hydrochloric acid on the following with chemical equation for magnesium ribbon second Sodium Hydroxide 3rd Cross eggshells write the chemical formula of hydrated copper sulphate and any hydrous copper sulphate giving an activity to illustrate how these are enter convertible

Answer»

ANSWER:

the WHITE COLOUR is plaster of Paris according to me

Discussion

16.	What is the oxidation state of OH
Answer» OH exists as OH- oxidation state of O in OH- is -1 and oxidation state of H is +1 in OH-1 hope this HELPS

16.

What is the oxidation state of OH

Answer»

OH exists as OH-

oxidation state of O in OH- is -1 and

oxidation state of H is +1 in OH-1

hope this HELPS

Discussion

17.	Why liquids have fixed volume but not fixed shape
Answer» Answer: Because there are very LARGE INTERMOLECULAR SPACES between and and very LESS intermolecular forces of attraction between the particles. That's why they are very loosely packed. So, liquids do not have fixed shape.

17.

Why liquids have fixed volume but not fixed shape

Answer»

Answer:

Because there are very LARGE INTERMOLECULAR SPACES between and and very LESS intermolecular forces of attraction between the particles. That's why they are very loosely packed. So, liquids do not have fixed shape.

Discussion

18.	Write a modular mass of a first 30 elements in the periodic table
Answer» HLO.. here is UR ANSWER HOPE it will HELP you.. :)

18.

Write a modular mass of a first 30 elements in the periodic table

Answer»

HLO..

here is UR ANSWER

HOPE it will HELP you.. :)

Discussion

19.	How much time is required for complete decomposition of one mole of water in electrolysis using a current of 1.5ampere
Answer» Answer: haff HOUR we NEED ELECTROLYSIS of water

19.

How much time is required for complete decomposition of one mole of water in electrolysis using a current of 1.5ampere

Answer»

Answer:

haff HOUR we NEED ELECTROLYSIS of water

Discussion

20.	200 ml of 0.005 m agno3 reacts with 300 ml of 0.01 m kcl. If ksp of agcl is 1.8 1010. Then maximum conc. Of ag+ in mixture is
Answer» Given: 200 ml of 0.005 M AgNo3 reacts with 300 ml of 0.01 M KCl. To find: The maximum concentration of AG+ in mixture? Solution: Now we have number of moles of: Ag+ ions = 200 x 0.005 / 1000 = 10^-3 moles Cl- ions = 300 x 0.01 / 100 = 3 x 10^-3 moles. Now the ionic equation is: Ag+(aq) + Cl-(aq) ----------> AgCl (s) But Cl- ions are more that Ag+ ions, so it will consume all Ag+ ions and FORM AgCl. Then the amount of Cl- ions left will be: 3 x 10^-3 - 10^-3 2 x 10^-3 moles. [ Cl-] (left ) = 2 x 10^-3 / 500 x 1000 = 4 x 10^-3 M = 0.004 M Now dissociation of AgCl into its ions will PRODUCE an equal amount of each ion. Let the produced ions be S. Then [ Ag+ ] = S and [ a- ] = S + 0.004 ≃ 0.004 K(cp) = [ Ag+ ] [ Cl- ] = 1.8 x 10^-10 [ Ag+ ] = 1.8 x 10^-10 / [ Cl- ] [ Ag+ ] = 1.8 x 10^-10 / 0.004 So, maximum concentration of Ag+ in the mixture is 4.5×10^-8 M. Answer: So, maximum concentration of Ag+ in the mixture is 4.5×10^-8 M.

20.

200 ml of 0.005 m agno3 reacts with 300 ml of 0.01 m kcl. If ksp of agcl is 1.8 1010. Then maximum conc. Of ag+ in mixture is

Answer»

Given: 200 ml of 0.005 M AgNo3 reacts with 300 ml of 0.01 M KCl.

To find: The maximum concentration of AG+ in mixture?

Solution:

Now we have number of moles of:

Ag+ ions = 200 x 0.005 / 1000 = 10^-3 moles

Cl- ions = 300 x 0.01 / 100 = 3 x 10^-3 moles.

Now the ionic equation is:

Ag+(aq) + Cl-(aq) ----------> AgCl (s)

But Cl- ions are more that Ag+ ions, so it will consume all Ag+ ions and FORM AgCl.

Then the amount of Cl- ions left will be:

3 x 10^-3 - 10^-3

2 x 10^-3 moles.

[ Cl-] (left ) = 2 x 10^-3 / 500 x 1000

= 4 x 10^-3 M

= 0.004 M

Now dissociation of AgCl into its ions will PRODUCE an equal amount of each ion. Let the produced ions be S.

Then [ Ag+ ] = S and [ a- ] = S + 0.004 ≃ 0.004

K(cp) = [ Ag+ ] [ Cl- ] = 1.8 x 10^-10

[ Ag+ ] = 1.8 x 10^-10 / [ Cl- ]

[ Ag+ ] = 1.8 x 10^-10 / 0.004

So, maximum concentration of Ag+ in the mixture is 4.5×10^-8 M.

Answer:

So, maximum concentration of Ag+ in the mixture is 4.5×10^-8 M.

Discussion

21.	1 to 20 elements with their symbols atomic number electronic configuration
Answer» Answer: 14 Si silicon 2.8.4 15 P phosphorus 2.8.5 16 S sulfur 2.8.6 17 Cl chlorine 2.8.7 18 Ar argon 2.8.8 19 K potassium 2.8.8.1 20 Ca calcium 2.8.8.2 i HOPE its HELP you.

21.

1 to 20 elements with their symbols atomic number electronic configuration

Answer»

Answer:

14

Si

silicon

2.8.4

15

P

phosphorus

2.8.5

16

S

sulfur

2.8.6

17

Cl

chlorine

2.8.7

18

Ar

argon

2.8.8

19

K

potassium

2.8.8.1

20

Ca

calcium

2.8.8.2

i HOPE its HELP you.

Discussion

22.	The thermal stability order for group 14 halides is
Answer» EXPLANATION: Hope this ANSWER helps you please mark me as brainliest plssssssssse The thermal stability of group 14 tetrahalides DECREASES down the group that is it FOLLOWS the order CX4>SiX4>GeX4>SnX4. I think it's correct if it is correct mark me as brainliest plssssssssse

22.

The thermal stability order for group 14 halides is

Answer»

EXPLANATION:

Hope this ANSWER helps you please mark me as brainliest plssssssssse

The thermal stability of group 14 tetrahalides DECREASES down the group that is it FOLLOWS the order CX4>SiX4>GeX4>SnX4.

I think it's correct if it is correct mark me as brainliest plssssssssse

Discussion

23.	Q) Mention Types Of Reactiona) A + BC--> AC + Bb) A + B---> Cc) X---> Y + Zd) PQ + RS--> PS + RQe)A2O3 + 2B --> B2 + O3 + 2A
Answer» (a) DISPLACEMENT REACTION

Discussion

24.	Why does sodium lose an electron easjly than the other elements in the 3rd period
Answer» EXPLANATION: Because it has to REDUCE an ELECTRON to COMBINE with other ELEMENTS...

24.

Why does sodium lose an electron easjly than the other elements in the 3rd period

Answer»

EXPLANATION:

Because it has to REDUCE an ELECTRON to COMBINE with other ELEMENTS...

Discussion

25.	An element with 23 electronsHow many protons, neutrons, and electrons are in each of the following atoms?(a) 15 7 N (b) 60 27 Co(c) 131 53 l (D) 142 58 ce How many protons and neutrons are in the nucleus of the following atoms?(a) 27 AI(b) 32 s(c) 64 Zn (d) 207 82 pb
Answer» ANSWER: a) 15 7N a)17 AL

25.

An element with 23 electronsHow many protons, neutrons, and electrons are in each of the following atoms?(a) 15 7 N (b) 60 27 Co(c) 131 53 l (D) 142 58 ce How many protons and neutrons are in the nucleus of the following atoms?(a) 27 AI(b) 32 s(c) 64 Zn (d) 207 82 pb

Answer»

ANSWER:

a) 15

7N

a)17 AL

Discussion

26.	If the distance between the Cl atoms in Cl2 molecule is 1.98Å,then the radius of atom is?
Answer» its is 1.98÷2= 0.99A°............

Discussion

27.	Co2 is a gas.justify the statement by giving two reasons
Answer» Answer: yes CARBON Dioxide is a GAS the only condition is "at room TEMPERATURE" Explanation: See "the temperature at which the vapour pressure of carbon dioxide becomes equal to the atmospheric pressure " (or in SIMPLE words boiling point) is -78.5°C and the room temperature is 25°C so there's a lot of difference in temperature/ the temperature is a lot higher than boiling point thus CO2 EXISTS in gaseous state.

27.

Co2 is a gas.justify the statement by giving two reasons

Answer»

Answer: yes CARBON Dioxide is a GAS the only condition is "at room TEMPERATURE"

Explanation:

See "the temperature at which the vapour pressure of carbon dioxide becomes equal to the atmospheric pressure " (or in SIMPLE words boiling point) is -78.5°C and the room temperature is 25°C so there's a lot of difference in temperature/ the temperature is a lot higher than boiling point thus CO2 EXISTS in gaseous state.

Discussion

28.	Explain.the.meanings.of.malleable.and.ductile
Answer» Explanation: Malleable =The METAL's which are DRAWN in Wire Ductile =These are the METALS Which Are drawn into THIN sheet

28.

Explain.the.meanings.of.malleable.and.ductile

Answer»

Explanation:

Malleable =The METAL's which are DRAWN in Wire

Ductile =These are the METALS Which Are drawn into THIN sheet

Discussion

29.	Particles of matters have space in between them example
Answer» HELLO ❤️❤️ Answer:- When sugar is ADDED to the water, the sugar the particles adjust themselves in the SPACE between the water particles. HENCE, we can say that particles of matter have space between them. ❤️❤️❤️❤️❤️❤️

29.

Particles of matters have space in between them example

Answer»

HELLO ❤️❤️

Answer:-

When sugar is ADDED to the water, the sugar the particles adjust themselves in the SPACE between the water particles. HENCE, we can say that particles of matter have space between them.

❤️❤️❤️❤️❤️❤️

Discussion

30.	Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form solid magnesium nitride.
Answer» ANSWER: EXPAIN the arrangement of SOLID LIQUID and gas Explanation: Expain the arrangement of solid liquid and gas

30.

Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form solid magnesium nitride.

Answer»

ANSWER:

EXPAIN the arrangement of SOLID LIQUID and gas

Explanation:

Expain the arrangement of solid liquid and gas

Discussion

31.	Sulfuric acid concentration b y membrane distillation
Answer» Answer: Membrane distillation (MD) is a separation process based on evaporation through a MICROPOROUS hydrophobic membrane. It has been studied to concentrate dilute AQUEOUS sulfuric acid solution, and the maximum CONCENTRATION of 40 WT.% could be obtained

31.

Sulfuric acid concentration b y membrane distillation

Answer»

Answer:

Membrane distillation (MD) is a separation process based on evaporation through a MICROPOROUS hydrophobic membrane.

It has been studied to concentrate dilute AQUEOUS sulfuric acid solution, and the maximum CONCENTRATION of 40 WT.% could be obtained

Discussion

32.	Sulphonation is nucleophilic or electrophilic reaction?
Answer» Answer: electrophilic Explanation: sulfonation is example of electrophilic AROMATIC substitution. sulfur TRIOXIDE (SO3) is the ELECTROPHILES and individually REACT with benzene to give benzenesulfonic acid respectively.

32.

Sulphonation is nucleophilic or electrophilic reaction?

Answer»

Answer:

electrophilic

Explanation:

sulfonation is example of electrophilic AROMATIC substitution. sulfur TRIOXIDE (SO3) is the ELECTROPHILES and individually REACT with benzene to give benzenesulfonic acid respectively.

Discussion

33.	Structure of methyl orange in acidic and basic medium
Answer» Answer: METHYL ORANGE turns RED in ACIDS and yellow in bases

33.

Structure of methyl orange in acidic and basic medium

Answer»

Answer:

METHYL ORANGE turns RED in ACIDS and yellow in bases

Discussion

34.	Structure properties and applications of polyvinyl chloride
Answer» Explanation: POLYVINYL CHLORIDE (PVC),a SYNTHETIC resin MADE from the POLYMERIZATION of vinyl chloride

34.

Structure properties and applications of polyvinyl chloride

Answer»

Explanation:

POLYVINYL CHLORIDE (PVC),a SYNTHETIC resin MADE from the POLYMERIZATION of vinyl chloride

Discussion

35.	What is the name of the symbol sc and atomic number?
Answer» ANSWER: SCANDIUM ATOMIC NUMBER 21

35.

What is the name of the symbol sc and atomic number?

Answer»

ANSWER:

SCANDIUM

ATOMIC NUMBER 21

Discussion

36.	The ratio of radii of first orbital of h,he+ and li2+ is
Answer» $He^+$ $Li^{<klux>2</klux>+}$ Thus the ratio of radii of first orbital of H , and is 3: 2: 1 Explanation: Radius of an atom is given by the Bohr's equation: $r=\frac{0.529\times n^2}{Z}A^0$ where, r = radius of atom n = number of orbit, for first n = 1, for second n = 2 and so on. Z = ATOMIC number a) For first orbital of H $r=\frac{0.529\times 1^2}{1}A^0$ $r=0.529A^0$ $He^+$ B) For first orbital of $r=\frac{0.529\times 1^2}{2}A^0$ $r=0.264A^0$ $Li^{2+}$ b) For first orbital of $r=\frac{0.529\times 1^2}{3}A^0$ $r=0.176A^0$ $He^+$ $Li^{2+}$ Thus the ratio of radii of first orbital of H , and is 3: 2: 1 Learn more about Bohr radius brainly.in/question/3266241 brainly.in/question/276068

36.

The ratio of radii of first orbital of h,he+ and li2+ is

Answer»

$He^+$ $Li^{<klux>2</klux>+}$ Thus the ratio of radii of first orbital of H , and is 3: 2: 1

Explanation:

Radius of an atom is given by the Bohr's equation:

$r=\frac{0.529\times n^2}{Z}A^0$

where,

r = radius of atom

n = number of orbit, for first n = 1, for second n = 2 and so on.

Z = ATOMIC number

a) For first orbital of H

$r=\frac{0.529\times 1^2}{1}A^0$

$r=0.529A^0$

$He^+$ B) For first orbital of

$r=\frac{0.529\times 1^2}{2}A^0$

$r=0.264A^0$

$Li^{2+}$ b) For first orbital of

$r=\frac{0.529\times 1^2}{3}A^0$

$r=0.176A^0$

$He^+$ $Li^{2+}$ Thus the ratio of radii of first orbital of H , and is 3: 2: 1

Learn more about Bohr radius

brainly.in/question/3266241

brainly.in/question/276068

Discussion

37.	Yellow light emitted from a Na lamp having wavelength 500 A. calculate its frequency and wave number
Answer» Answer: Frequency is 6×10^-17 Wavenumber is 2×10^7 Explanation: Frequency is =c÷WAVELENGTH implies Frequency is 3×10^8÷500×10^-10 Frequency is 6×10^-17 Wavenumber is reciprocal of wavelength implies 1÷500×10^-10 Wavenumber is 2×10^7 If you LIKE my answer then BRAINLIEST it PLEASE :)

37.

Yellow light emitted from a Na lamp having wavelength 500 A. calculate its frequency and wave number

Answer»

Answer:

Frequency is 6×10^-17

Wavenumber is 2×10^7

Explanation:

Frequency is =c÷WAVELENGTH implies

Frequency is 3×10^8÷500×10^-10

Frequency is 6×10^-17

Wavenumber is reciprocal of wavelength implies 1÷500×10^-10

Wavenumber is 2×10^7

If you LIKE my answer then BRAINLIEST it PLEASE :)

Discussion

38.	what is a reaction for this silver nitrate + potassium iodide --> potassium nitrate and silver iodide
Answer» Answer: CHEMICAL REACTION AgNO3 + KI----------- KNO3 + AgI hope it will help you

38.

what is a reaction for this silver nitrate + potassium iodide --> potassium nitrate and silver iodide

Answer»

Answer:

CHEMICAL REACTION

AgNO3 + KI----------- KNO3 + AgI

hope it will help you

Discussion

39.	write the formula of the oxides formed by sodium and chlorine and by means of their chemical reaction with water. Classify them as acidic or basic oxide.
Answer» sodium CHLORIDE ADDED with WATER GIVES hydrochloric acid +sodium OXIDE here in this reaction hydrochloric acid is a acidic and sodium oxide is basic ssdddd

39.

write the formula of the oxides formed by sodium and chlorine and by means of their chemical reaction with water. Classify them as acidic or basic oxide.

Answer»

sodium CHLORIDE ADDED with WATER GIVES hydrochloric acid +sodium OXIDE

here in this reaction hydrochloric acid is a acidic and sodium oxide is basic ssdddd

Discussion

40.	What is cation n anions......
Answer» REFER to the ATTACHMENT!!!

40.

What is cation n anions......

Answer»

REFER to the ATTACHMENT!!!

Discussion

41.	Write the causes of depletion of ozone layer.how can we prevent it .
Answer» Answer: Explanation: The ozone layer is not uniform throughout the earth; it is found in a thick layer at some places and a thin layer at others. If this layer becomes too thin, it cannot stop the UV rays from entering the earth and we say that a hole is formed in the ozone layer. Antarctica has the biggest ozone hole followed by the Arctic region and the Tibetan plateau. In these places, the layer was naturally thin, but over the years due to air pollution, these holes have grown bigger and thinner. They are a serious cause of worry across the world. Causes of Ozone Layer Depletion The primary reason behind the reduction of the ozone layer is the use of Hydro- Chloro-fluoro-carbons (HCFCs) and chloro-fluoro-carbons ( CFCs). They are COMPOUNDS of chlorine, fluorine, and carbon such as CF3Cl, CHCl2F etc. These are used as REFRIGERANTS in refrigerators, air conditioners, and in cooling plants. These molecules can destroy O3 molecules and therefore depletion of the O3 layer. Nitrogen oxides such as nitrous oxide are also very reactive to O3 and are also responsible for holes in the ozone layer. These molecules are RELEASED by burning fossil fuels by cars and especially airplanes which fly NEAR the ozone layer. Since 1975, the hole has increased in size due to depletion in the ozone layer. Reductions of up to 70% have been found in some areas. Prevention of Ozone Layer Depletion All is not lost though. The depletion of the O3 layer has almost stopped today and there are signs that it can grow back. This is because countries around the world have agreed to stop the production and use of CFCs and HCFCs. They have also introduced the application of bio-control agents for controlling the plant pests. In January 1989, the Montreal protocol was signed to limit the use of CFCs and HCFCs. 197 countries have ratified this protocol which has reduced CFC production by 98% today. It remains the most successful environmental treaty to this date. Today there are better CFC free refrigerants available that do not pollute the atmosphere. Almost all the air-conditioners and refrigerators you buy today do not contain these harmful POLLUTANTS.

41.

Write the causes of depletion of ozone layer.how can we prevent it .

Answer»

Answer:

Explanation:

The ozone layer is not uniform throughout the earth; it is found in a thick layer at some places and a thin layer at others. If this layer becomes too thin, it cannot stop the UV rays from entering the earth and we say that a hole is formed in the ozone layer. Antarctica has the biggest ozone hole followed by the Arctic region and the Tibetan plateau. In these places, the layer was naturally thin, but over the years due to air pollution, these holes have grown bigger and thinner. They are a serious cause of worry across the world.

Causes of Ozone Layer Depletion

The primary reason behind the reduction of the ozone layer is the use of Hydro- Chloro-fluoro-carbons (HCFCs) and chloro-fluoro-carbons ( CFCs). They are COMPOUNDS of chlorine, fluorine, and carbon such as CF3Cl, CHCl2F etc. These are used as REFRIGERANTS in refrigerators, air conditioners, and in cooling plants. These molecules can destroy O3 molecules and therefore depletion of the O3 layer.

Nitrogen oxides such as nitrous oxide are also very reactive to O3 and are also responsible for holes in the ozone layer. These molecules are RELEASED by burning fossil fuels by cars and especially airplanes which fly NEAR the ozone layer.

Since 1975, the hole has increased in size due to depletion in the ozone layer. Reductions of up to 70% have been found in some areas.

Prevention of Ozone Layer Depletion

All is not lost though. The depletion of the O3 layer has almost stopped today and there are signs that it can grow back. This is because countries around the world have agreed to stop the production and use of CFCs and HCFCs.

They have also introduced the application of bio-control agents for controlling the plant pests. In January 1989, the Montreal protocol was signed to limit the use of CFCs and HCFCs. 197 countries have ratified this protocol which has reduced CFC production by 98% today. It remains the most successful environmental treaty to this date.

Today there are better CFC free refrigerants available that do not pollute the atmosphere. Almost all the air-conditioners and refrigerators you buy today do not contain these harmful POLLUTANTS.

Discussion

42.	What is the relative atomic mass of hydrogen ?(step by step)
Answer» ANSWER: EXPLANATION:FCK me hard BOYS my FBI I'd is Arunegi

42.

What is the relative atomic mass of hydrogen ?(step by step)

Answer»

ANSWER:

EXPLANATION:FCK me hard BOYS my FBI I'd is Arunegi

Discussion

43.	Identify the most reactive and the least reactive metal amongst the following - aluminum; potassium ; copper; iron ; zinc; gold
Answer» Answer:Most REACTIVE :- Potassium LEAST Reactive :- Gold Explanation: According to the reactivity series the most reactive among them is Potassium as it is among the TOP elements and gold is ONE of the last ones..☺

43.

Identify the most reactive and the least reactive metal amongst the following - aluminum; potassium ; copper; iron ; zinc; gold

Answer»

Answer:Most REACTIVE :- Potassium

LEAST Reactive :- Gold

Explanation:

According to the reactivity series the most reactive among them is Potassium as it is among the TOP elements and gold is ONE of the last ones..☺

Discussion

44.	Structure of cholesterol and biological significance
Answer» Answer: Since the structure of cholesterol differs from PHOSPHOLIPIDS, it disrupts the normal reactions between fatty acid chains. ... Cholesterol is USUALLY synthesized in animals and smaller cholesterol can be generated in plants. They are IMPORTANT in the composition of CELL membranes and also STEROID hormones

44.

Structure of cholesterol and biological significance

Answer»

Answer:

Since the structure of cholesterol differs from PHOSPHOLIPIDS, it disrupts the normal reactions between fatty acid chains. ...

Cholesterol is USUALLY synthesized in animals and smaller cholesterol can be generated in plants.

They are IMPORTANT in the composition of CELL membranes and also STEROID hormones

Discussion

45.	The random motion of holes and electrons due to thermal education is called
Answer» ANSWER: This CARRIER flow, called "DIFFUSION", is caused by the RANDOM motion of carriers. ... The same derivation is hold for holes which LEADS to .

45.

The random motion of holes and electrons due to thermal education is called

Answer»

ANSWER:

This CARRIER flow, called "DIFFUSION", is caused by the RANDOM motion of carriers. ... The same derivation is hold for holes which LEADS to .

Discussion

46.	The rate of diffusion of hydrogen and deuterium are in the ratio as
Answer» just...SIMPLE.. ARK as BRAINLIEST

46.

The rate of diffusion of hydrogen and deuterium are in the ratio as

Answer»

just...SIMPLE..

ARK as BRAINLIEST

Discussion

47.	In an atom how many orbital (s) will have the quantum numbers ; n=3, l=3, m=+2?
Answer» EXPLANATION: Only ONE ORBITAL is POSSIBLE

47.

In an atom how many orbital (s) will have the quantum numbers ; n=3, l=3, m=+2?

Answer»

EXPLANATION:

Only ONE ORBITAL is POSSIBLE

Discussion

48.	How many planets are present in our solar system? please
Answer» There are 8 PLANETS PRESENT in our SOLAR SYSTEM

Discussion

49.	Which is the strongest acid, a. HCL, HBR, HI.
Answer» ANSWER: Answer is HCL because it is the STRONGEST ACID .

49.

Which is the strongest acid, a. HCL, HBR, HI.

Answer»

ANSWER:

Answer is HCL because it is the STRONGEST ACID .

Discussion

50.	Given names and symbols for the following elements(a) An element with atomic number 6(b) An element with 18 protons in its nucleus(c) an element with 23 electrons
Answer» So let's find the names and symbols for the following ELEMENTS (a) An element with atomic number 6 NAME of element : Carbon Symbol : C (b) An element with 18 protons in its nucleus Name of element : Chlorine Symbol : Cl (c) an element with 23 electrons Name of element : Vanadium Symbol : V Some quick RELATED points Electrons have negative CHARGE Protons have positive charge Neutrons have no charge. Atomic number is the number of protons (or) the number of electrons in a electrically NEUTRAL atom Mass number is the sum of protons and neutrons.

50.

Given names and symbols for the following elements(a) An element with atomic number 6(b) An element with 18 protons in its nucleus(c) an element with 23 electrons

Answer»

So let's find the names and symbols for the following ELEMENTS

(a) An element with atomic number 6

NAME of element : Carbon

Symbol : C

(b) An element with 18 protons in its nucleus

Name of element : Chlorine

Symbol : Cl

(c) an element with 23 electrons

Name of element : Vanadium

Symbol : V

Some quick RELATED points

Electrons have negative CHARGE
Protons have positive charge
Neutrons have no charge.

Atomic number is the number of protons (or) the number of electrons in a electrically NEUTRAL atom

Mass number is the sum of protons and neutrons.

Discussion

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CHEMICAL REACTION

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hope it will help you

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