Tag: nitrogen and sulfur

Questions Related to nitrogen and sulfur

Consider the equilibrium $NH _{4}Cl (s)\rightleftharpoons NH _{3}(g) + HCl(g)$. An inert gas is added to the system at constant volume and temperature. The correct statement(s) is/ are:

chemistry nitrogen and sulfur ammonia and fertilizers preparation of ammonia-laboratory method and haber's process ammonia

  1. the partial pressures of $NH _{3}$ and $HCl$ in the system will increase

  2. the partial pressures of $NH _{3}$ and $HCl$ in the system will remain the same

  3. the partial pressures of $NH _{3}$ and $HCl$ in the system will decrease

  4. the entropy of the system will increase

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Correct Option: B,D
Explanation:

$NH _4$ $+$ $Cl(s)$ $\rightleftharpoons$ $NH _3 (g)$ $+$ $HCl$.

Noble gas are  inert hence adding inert gas doesn't effect the partial pressure.
This is because noble gas gets added to both reactant and product.
$X (g)$ $+$ $NH _4Cl (S)$ $ \rightleftharpoons $ $NH _3(g)$ $+$ $HCl(g)$ $+$ $X(g)$
Where X=Noble gas
Hence the partical presence of $NH _3$ and $HCl$ will remain same.
The amount of gas in the system will increase after adding inert gas.
Since gases has high entropy than liquid and solid, the entropy  of the system will increase.  

Magnesium on heating to redness in an atmosphere of $N _{2}$ and then on treating with $H _{2}O$ gives?

chemistry nitrogen and sulfur ammonia and fertilizers preparation of ammonia-laboratory method and haber's process ammonia

  1. $NH _{3}$

  2. $H _{2}$

  3. $N _{2}$

  4. $O _{2}$

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Correct Option: A
Explanation:
Megnesium when heated with $N _2$ in atmosphere it forms magnesium nitride($Mg _3N _2$) which on hydrolysis(reaction with water) gives ammonia.
$3Mg+N _2\rightarrow Mg _3N _2$
$Mg _3N _2+6H _2O\rightarrow 3Mg(OH) _2+2NH _3$.
Hence option A is correct.

Ammonia gas can be collected by the displacement of:

chemistry nitrogen and sulfur ammonia and fertilizers preparation of ammonia-laboratory method and haber's process ammonia

  1. Conc. $H _2SO _4$

  2. Brine

  3. Water

  4. Mercury

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Correct Option: D
Explanation:

Ammonia is less dense than air hence can be collected by upward displacement of air and mercury.

In Haber's process $50.0\ g$ of $N _{2}(g)$ and $10.0\ g$ of $H _{2}(g)$ are mixed to produced $NH _{3}(g)$. What are the number of moles of $NH _{3}(g)$ formed?

chemistry nitrogen and sulfur ammonia and fertilizers preparation of ammonia-laboratory method and haber's process ammonia

  1. $3.33$

  2. $2.36$

  3. $2.01$

  4. $5.36$

Show answer
Correct Option: A
Explanation:
$N _2 + 3H _2 \rightarrow2NH3$
Here.
28 g $N _2$ reacts with 6 g of $H _2$
So,
50 g of $N _2$ react with $\dfrac{6}{28}\times50 g -H _2 = 10.7 g$ but we have only 10g so $H _2$ is limiting reagent..

6 g $H _2$ gives 34g $NH _3$
10g $H _2$ will give $\dfrac{34}{6}\times10=56.67g -NH _3$
So number of moles of $NH _3$ formed is,
$=\dfrac{Given-mass}{Molar-mass}=\dfrac{56.67}{17}=3.33-moles$