Tag: component of air - nitrogen

Questions Related to component of air - nitrogen

Density of nitrogen gas prepared from air is slightly greater than that of nitrogen prepared by chemical reaction from a compound of nitrogen, because aerial nitrogen contains: 

chemistry preparation of gases nitrogen gas component of air - nitrogen nitrogen

  1. $CO _2$

  2. Argon

  3. some $N _2$ molecules analogous to $O _2$

  4. greater amount of $N _2$ molecules derived from $N-15$ isotope

Show answer
Correct Option: D
Explanation:

The density of nitrogen gas prepared from the air is slightly greater than that of nitrogen prepared by chemical reaction from a compound of nitrogen, because aerial nitrogen contains a greater amount of $\displaystyle N _2$ molecules derived from $\displaystyle N-15$ isotope.
Note: Molecules containing $\displaystyle N-15$ isotope are heavier than molecules containing$\displaystyle N-14$ isotope as N atom has more number of neutrons.

Which of the following gives nitrogen on thermal decomposition?

chemistry preparation of gases nitrogen gas component of air - nitrogen nitrogen

  1. Ammonium nitrite

  2. Ammonia

  3. Ammonium dichromate

  4. Air

Show answer
Correct Option: A,C
Explanation:

$ { { (NH } _{ 2 }) } _{ 2 }{ Cr } _{ 2 }{ O } _{ 7 }\xrightarrow [ thermal\quad decomposition ]{ \Delta  } { Cr } _{ 2 }{ O } _{ 3 }+{ N } _{ 2 }+4{ H } _{ 2 }O\ N{ H } _{ 4 }{ NO } _{ 2 }\xrightarrow [ thermal\quad decomposition ]{ \Delta  } { N } _{ 2 }+2{ H } _{ 2 }O $

Ammonium nitrite and Ammonium dichromate both give nitrogen on thermal decomposition.