Tag: preparation of gases

Quizzes (3) Questions (29)

Questions Related to preparation of gases

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

Which of the following compounds does not give $N _2$ when heated?

  1. $NH _4NO _2$
  2. $NH _4NO _3$
  3. $NaN _3$

  4. Both A and B
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$(1)NH _4NO _2\overset{\Delta }{\rightarrow}N _2+2H _2O$
$(2)NH _4NO _3\overset{\Delta }{\rightarrow}N _2O+2H _2O$
$(3)2NaN _3\overset{\Delta }{\rightarrow}3N _2+2Na$

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

In the reaction,

${ \left( { NH } _{ 4 } \right)  } _{ 2 }{ Cr } _{ 2 }{ O } _{ 7 }\xrightarrow [  ]{ \Delta  } { N } _{ 2 }+{ H } _{ 2 }O+{ Cr } _{ 2 }{ O } _{ 3 }$

The coefficient of ${H} _{2}O$ is :

  1. $1$
  2. $2$
  3. $3$
  4. $4$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$ (NH _4) _2Cr _2O _7(s) \rightarrow N _2(g) + 4 H _2O(g) + Cr _2O _3(s)$


To balance the reaction we require 4 moles of $H _2O$.

Hence option D is correct.

Multiple choice chemistry preparation of gases nitrogen gas component of air - nitrogen 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: 

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

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

Which of the following gives nitrogen on thermal decomposition?

  1. Ammonium nitrite

  2. Ammonia

  3. Ammonium dichromate

  4. Air
Reveal answer Fill a bubble to check yourself
A,C Correct answer
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.