Tag: constituents of air

Questions Related to constituents of air

State True or False.
Liquid nitrogen is used as a refrigerant to preserve biological specimens.

chemistry water and air and their importance natural cycles and resources constituents of air component of air - nitrogen

  1. True

  2. False

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Correct Option: A
Explanation:

Liquid nitrogen is used as a refrigerant to preserve biological specimens because of its low temperature (-196$^o$) that does not cause cell breakdown or affect any other cellular mechanisms.

The potato chips manufacturers uses _____ gas to flush the chips bags to prevent the chips getting oxidised.

chemistry water and air and their importance natural cycles and resources constituents of air component of air - nitrogen

  1. Oxygen

  2. Carbon dioxide

  3. Chlorine

  4. Nitrogen

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Correct Option: D
Explanation:

Oil and fat containing food items are flushed with nitrogen because the food containing fats and oil become rancid after sometime because of oxidation and give smell having a bad taste. Presence of nitrogen helps food to save from rancidity.

The three elements most usually contained in fertilizers are:

chemistry water and air and their importance natural cycles and resources constituents of air component of air - nitrogen

  1. Potassium, phosphorus and carbon

  2. Sodium, nitrogen and phosphorus

  3. Silica, nitrogen and phosphorus

  4. Potassium, phosphorus and nitrogen

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Correct Option: D
Explanation:

Fertilizers are composed of three macronutrients, $NPK$ nitrogen, phosphorous and potassium.

Nitrogen ($N$): Leaf growth;
Phosphorus ($P$): Development of roots, flowers, seeds, fruit;
Potassium ($K$): Strong stem growth, movement of water in plants, promotion of flowering and fruiting;

Lime water turns milky when exposed. to air and stirred. This shows that air contains:

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

  1. carbon dioxide

  2. hydrogen

  3. nitrogen

  4. oxygen

Show answer
Correct Option: A
Explanation:

Lime water turns milky when exposed to air and stirred as lime water mixes with $CO _{2}$ and forms $CaCO _{3}$ (calcium carbonate) which turns the lime water milky. 

$CaO+CO _{2} \longrightarrow CaCO _{3}$