Tag: air and atmosphere

Questions Related to air and atmosphere

When $H _2S$ burns completely in oxygen, the products include:
(1) S
(2) $SO _2$
(3) $H _2O$

chemistry air and atmosphere carbon dioxide - an oxide of carbon component of air - carbon dioxide oxides of non metal

  1. If 1, 2 and 3 are correct

  2. If only 1 and 2 are correct

  3. If only 2 and 3 are correct

  4. If only 1 is correct

  5. If only 3 is correct

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Correct Option: C
Explanation:

$H _2S$ burns completely in the presence of oxygen as:

${ 2H } _{ 2 }S+{ 3O } _{ 2 }\rightarrow { 2SO } _{ 2 }+2{ H } _{ 2 }O$

Give the characteristic test for $O _{2}$ gas.

chemistry air and atmosphere carbon dioxide - an oxide of carbon component of air - carbon dioxide oxides of non metal

  1. Lime water test

  2. Potassium permanganate test

  3. Burning candle test

  4. All of these

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Correct Option: C
Explanation:

Characteristic test for oxygen ($O _{2}$) can be performed on the basis that oxygen supports burning. Therefore if we bring a burning candle near the source of oxygen, the intensity of the flame increases.

Dry ice on heating converts into:

chemistry air and atmosphere carbon dioxide - an oxide of carbon component of air - carbon dioxide oxides of non metal

  1. liquid

  2. do not convert

  3. gas

  4. none of the above

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Correct Option: C
Explanation:
Dry ice is the solid state of the gas carbon dioxide.when the pressure under which dry ice is decreased to 1atm it gets converted directly to gas.
Dry ice sublimes on heating i.e. it converts directly into gas.

The density of carbon dioxide is around:

chemistry air and atmosphere carbon dioxide - an oxide of carbon component of air - carbon dioxide oxides of non metal

  1. $2.98 {kg}/{{m}^{3}}$

  2. $1.98 {kg}/{{m}^{3}}$

  3. $5.0 {kg}/{{m}^{3}}$

  4. $10.0 {kg}/{{m}^{3}}$

Show answer
Correct Option: B
Explanation:

Carbon dioxide is colorless. At low concentrations, the gas is odorless. At higher concentrations it has a sharp, acidic odor. At standard temperature and pressure, the density of carbon dioxide is around $1.98  {kg}/{{m}^{3}}$, about $1.67$ times that of air.

Carbon dioxide allows the earth to radiate out heat rapidly.

chemistry air and atmosphere carbon dioxide - an oxide of carbon component of air - carbon dioxide oxides of non metal

  1. True

  2. False

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Correct Option: B
Explanation:

Carbon dioxide gas does not allows the earth to radiate out heat rapidly. So, it is one of the green house gas.

Carbon dioxide exists in Earth's atmosphere as a:

chemistry air and atmosphere carbon dioxide - an oxide of carbon component of air - carbon dioxide oxides of non metal

  1. Metal

  2. Solid

  3. Trace gas

  4. Abundant gas

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Correct Option: C
Explanation:

Carbon dioxide exists in Earth's atmosphere as a trace gas at a concentration of about $0.04$ percent $\left(400   ppm\right)$ by volume. A trace gas is a gas which makes up less than $1$% by volume of the Earth's atmosphere.

Burning of carbon is an:

chemistry air and atmosphere carbon dioxide - an oxide of carbon component of air - carbon dioxide oxides of non metal

  1. exothermic Reaction

  2. endothermic Reaction

  3. both (a) and (b)

  4. none of these

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Correct Option: A
Explanation:

Burning of carbon is an exothermic reaction because heat is evolved in this reaction.
$C + O _2 \rightarrow CO _2 + $ heat
The enthalpy change is negative.

_________ form of water is present in oceans, lakes, rivers and even underground.

chemistry air and atmosphere natural cycles and resources constituents of air component of air - nitrogen

  1. Liquid 

  2. The gaseous

  3. The solid form

  4. None of the above

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Correct Option: A
Explanation:

Water can be found in liquid form in oceans, rivers, lakes and rain; in solid form in ice and snow; and as a gas (water vapour) in the atmosphere.

Snow and ice, are present as ________ at the poles of the earth, snow-covered mountains, and glaciers.

chemistry air and atmosphere natural cycles and resources constituents of air component of air - nitrogen

  1. liquid form

  2. the solid form

  3. the gaseous form

  4. none of the above

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Correct Option: B
Explanation:

Water can be found in liquid form in oceans, rivers, lakes and rain; in solid form in ice and snow; and as a gas (water vapour) in the atmosphere.


Hence, option B is correct.

_______ of the earth's surface is covered with water.

chemistry air and atmosphere natural cycles and resources constituents of air component of air - nitrogen

  1. 71%

  2. 72%

  3. 73%

  4. 74%

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Correct Option: A
Explanation:

$71\%$ of the earth's surface is covered with water. Hence, earth is also known as the Blue Planet.