Tag: component of air - carbon dioxide

Questions Related to component of air - carbon dioxide

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

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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.