Tag: nitrogen

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

Which of the following on heating will not evolve N$ _2$ gas?

  1. NH$ _{3}$ + NaNO$ _{2}$
  2. NH$ _{4}$Cl + NaNO$ _{2}$
  3. N$ _{2}$O + Cu
  4. (NH$ _{4}$)$ _{2}$Cr$ _{2}$O$ _{7}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The given reactions take place as:


$NH _3 + NaNO _2 \rightarrow NH _3NO _2 + Na$


$NH _4Cl + NaNO _2 \rightarrow N _2 + NaCl + 2H _2O$

$N _2O +Cu \rightarrow N _2 + CuO$

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



Hence, the reaction between ammonia and sodium nitrate do not evolve $N _2$ gas. 

Thus option A is the correct answer.

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

$Mg _3N _2 \xrightarrow{H _2O} A(gas) \xrightarrow[\triangle]{CuO} B + C(g) + H _2O$
$C(g)$ can be obtained by heating:

  1. $(NH _4) _2SO _4$
  2. $(NH _4) _2Cr _2O _7$
  3. $NH _4NO _3$
  4. $NH _4Cl$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$Mg _3N _2 \xrightarrow []{3H _2O} \underset {(A)}{2NH _3}+3MgO$

$NH _3 \xrightarrow []{CuO} \underset {(C)}{N _2}(g)+\underset {(B)}{Cu}+H _2O$
$N _2$ will be obtained by decomposition of Ammonium dichromate.
$(NH _4) _2Cr _2O _7 (s) \longrightarrow Cr _2O _3(g)+\underset {(C)}{N _2}+4H _2O$ .

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.