Tag: natural cycles and resources

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Questions Related to natural cycles and resources

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

All the plants require nitrogen for:

  1. reproduction

  2. photosynthesis

  3. transpiration

  4. growth
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
All the plants require nitrogen for growth. Nitrogen is found in healthy soils and give plants the energy to grow and produce fruit or vegetables. Nitrogen is part of the chlorophyll molecule, which gives plant their green colour and is involved in  creating food for the plant through photosynthesis.
So, the correct answer is 'growth'
Multiple choice chemistry water and air and their importance natural cycles and resources constituents of air component of air - nitrogen

Gas used as a refrigerant is:

  1. Nitrogen

  2. Oxygen

  3. Hydrogen

  4. Water gas
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

NITROGEN is used as a refrigerant. Nitrogen is a liquid at temperatures below 196.5 C and is used as a refrigerant for such things as preservation of blood and cooling of large computer systems, as well as some industrial uses. Being a liquid, it is more convenient to use for low temperature cooling than dry ice. Liquid nitrogen is also used in oil wells to build up pressure in order to force crude oil upward.

Multiple choice chemistry water and air and their importance natural cycles and resources constituents of air component of air - nitrogen
Nitrogen is used in high-temperature thermometer :

  1. To prevent vaporization of mercury.

  2. To improve conductivity of mercury.

  3. To maintain mercury to remain in its state.

  4. To increase the specific heat capacity of mercury.
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Explanation
The principle used to measure temperature is that of the apparent thermal expansion of the liquid. An inert gas is used for mercury intended to high temperature. The thermometer is filled with an inert gas such as argon or nitrogen above the mercury to reduce its volatilization.

Hence, both options (A) and (C) are correct.
Multiple choice chemistry water and air and their importance natural cycles and resources constituents of air component of air - nitrogen

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

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. Oxygen

  2. Carbon dioxide

  3. Chlorine

  4. Nitrogen
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

The three elements most usually contained in fertilizers are:

  1. Potassium, phosphorus and carbon

  2. Sodium, nitrogen and phosphorus

  3. Silica, nitrogen and phosphorus

  4. Potassium, phosphorus and nitrogen
Reveal answer Fill a bubble to check yourself
D Correct answer
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;

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

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

  1. carbon dioxide

  2. hydrogen

  3. nitrogen

  4. oxygen
Reveal answer Fill a bubble to check yourself
A Correct answer
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. 

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