Tag: air and atmosphere

Quizzes (15) Questions (49)

Questions Related to air and atmosphere

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

Which of following statements is true?

  1. The salinity of rivers increases with time

  2. The salinity of rivers decreases with time

  3. The salinity of seas increases with time

  4. The salinity of seas decreases with time
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A falling of rain on earth causes breaking up of rocks and transferring their minerals to the ocean, the ocean becomes saltier and by evaporation, water evaporates leaving salt in the oceans.


So, by this, we can say that salinity of increases with time.

Hence, the correct option is $\text{C}$

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

Almost all the water on the earth is contained in the:

  1. seas and oceans

  2. rivers, lakes, ice caps

  3. as ground water and in the atmosphere

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Almost all the water on the earth is contained in the oceans, seas, rivers, lakes, ice caps, as ground water and in atmosphere as water vapour.

Option (D) is the correct answer.

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

The main source of water for perennial rivers is in the form of:

  1. lakes

  2. rain water

  3. snow

  4. dams
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Perennial rivers flows continuously throughout the year irrespective of seasons. Mostly they originates from the mountain and water is fed by melting of glaciers. These river get water by rain in rainy season, melting of ice in summer and by snow in winter.

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

Which of the following elements would give water on burning?

  1. Hydrogen

  2. Oxygen

  3. Carbon

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

In a flame of pure hydrogen gas, burning in air, the hydrogen (H$ _2$) reacts with oxygen (O$ _2$) to form water (H$ _2$O) and releases energy. If carried out in atmospheric air instead of pure oxygen, as is usually the case, hydrogen combustion may yield small amounts of nitrogen oxides, along with the water vapour.


Hence, the correct option is $\text{A}$

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. 

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