Nitrogen | MCQs

Explanation

The percentage of oxygen in the air is about 20.95%.

The air is made up of many gases, including oxygen, nitrogen, argon, and carbon dioxide

***

Nitrogen

Nitrogen is the most abundant gas in the air, making up about 78% of it. 

Argon

Argon is the third most abundant gas in the air, making up about 0.93% of it. 

Carbon dioxide

Carbon dioxide is present in trace amounts in the air, making up about 0.04% of it. 

Explanation

The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen.

Explanation

The composition of dry air is:

1. Nitrogen (N2) - approximately 78.08% by volume
2. Oxygen (O2) - approximately 20.95% (21%) by volume
3. Argon (Ar) - approximately 0.93% by volume
4. Carbon Dioxide (CO2) - approximately 0.04% by volume (varies with location and time)

Explanation

Ammonium sulfate is an inorganic sulfate salt obtained by reaction of sulfuric acid with two equivalents of ammonia.

Explanation

• There is no such nitrogenous base as "Tracil".

The nitrogenous bases are:

1. Adenine (A)
2. Thymine (T)
3. Cytosine (C)
4. Guanine (G)

Explanation

• The old name of Nitrogen is Azote.
• This name, derived from the Greek word "azotikos" meaning "no life".
• It was given because nitrogen gas does not support respiration, making it inert or "lifeless" in this context.

Explanation

• Nitrogen (N2) is the most abundant constituent in air.
• Making up approximately 78% of the Earth's atmosphere.

The correct order of abundance:

• Nitrogen (N2) - 78%
• Oxygen (O2) - 21%
• Argon (Ar) - 0.93%
• Carbon Dioxide (CO2) - 0.04%

Explanation

• Nitrogen (N2) makes up approximately 78% of the Earth's atmosphere.
• Making it the gas present in air with the highest percentage.