Main Components

Q.

Air is a mixture of only three gasses nitrogen, oxygen and carbon dioxide.

1. True

2. False

Q.

Statement I: Air is a mixture of gases, water vapour and dust particles.

Statement II: Air is composed of only one gas that is nitrogen.

Statement III: Air is composed of two gases, nitrogen and oxygen only.

Which of the above statement is incorrect?

1. Only II

2. Only III

3. Only I

4. Both I and III

Q.

Write the physical properties of oxygen.

Q.

Nitrogen and oxygen are the major components in air. However, they do not combine at all to form nitric oxide under normal conditions. Give
reasons.

Q.

In the following statements, the underlined words are jumbled up. Write them in their correct form. (a) Air contains 78% ginroten and 21% gonexy. (b) Vehicles produce high level of pollutants like carbon dioxide, nitrogen oxides, nobrac moondexi and mosek. (c) Carbon dioxide, thaneme, nitrous oxide and water vapour are known as heengrouse sesga. (d) Gangotri glacier in Himalaya has started melting because of lablog ringwam. (e) Whenever harmful substances such as wagese, toxic chemicals, silt, etc. get mixed with water, the water becomes potdulle.

Q.

Kenneth wanted to interact more with John and Sam and hence decided to ask more about the composition of air. He asked John and Sam ' what is the exact composition of air?' Sam being the man with information took the liberty to explain him that the composition of air is not fixed everywhere and it varies from place to place but we can have a rough estimate of its composition. Sam further went ahead to make the following table.

Sam further went on to match the components in column I with the percentage by volume in column II as per the composition of air. Which of the following options are correct for the above table

1. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)

2. (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)

3. (a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)

4. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

Q.

Discuss the chemical properties of oxygen.

Q.

Air is considered to be a mixture.

Q.

The major component of air is ___________ .

Q.

The most abundant constituent of air is ___ .

Q. The rate of evaporation increases with the decrease in humidity.

1. True
2. False

Q. Which among the following gas is necessary for combustion to take place?

1. Nitrogen
2. Oxygen
3. Hydrogen
4. Chlorine

Q.

The most abundant constituent of air is

1. Oxygen

2. Nitrogen

3. Water vapour

4. Impurities

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Explain how air is a mixture.

Q. When we inhale air, the incoming dirt and dust particles sticks to a sticky layer called .

1. trachea
2. mucus
3. nasal hair
4. larynx

Q.

The most abundant constituent of air is ___ .

1. Oxygen

2. Water vapour

3. Nitrogen

4. Impurities

Q.

Find out the correct statement from the statements given below.

1. Air is a mixture of gases, water vapour and dust particles.

2. Air is a pure gas.

3. Air is composed of only nitrogen

4. Air is composed of only oxygen

Q. Which among the following gas is necessary for combustion to take place?

1. Nitrogen
2. Oxygen
3. Hydrogen
4. Chlorine