Tag: nitrogen and sulfur

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Questions Related to nitrogen and sulfur

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

Indicate which of the following statement is true or false.
The reaction between hydrogen and nitrogen to form ammonia is reversible.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
When hydrogen gas combines with nitrogen to form Ammonia the following chemical reaction will take place. Our equilibrium reaction will be
 $N _2$(g) + 3$H _2$(g) ⇔ 2$NH _3$(g) + Heat 

In this case, Hydrogen and nitrogen react together to form ammonia.

You can find the concentration/ mass of product (NH3) formed at equilibrium if you know the equilibrium constant (K) of the reaction.


The rate of reaction (forward or backward) changes with the change in pressure and temperature.

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

The compound that produces ammonia when treated with sodamide is 

  1. $CH _{3}-CH _{2}-CH=CH _{2}$
  2. $CH _{3}-C\equiv C-CH _{3}$
  3. $CH _{2}=CH-CH=CH _{2}$
  4. $CH _{3}-CH _{2}-C\equiv CH$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When treated with sodamide (NaNH2), terminal alkynes undergo a deprotonation reaction releasing ammonia gas because terminal alkyne protons are relatively acidic. Among the choices, CH3-CH2-C#CH is a terminal alkyne and will react with sodamide to produce ammonia.

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

Two major requirements for preparation of ammonia are

  1. Low temperature and high pressure

  2. Low temperature and present pressure

  3. High temperature and low pressure

  4. High temperature and high pressure
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This reaction is 

(a) reversible,

 (b) exothermic, and 

(c) proceeds with a decrease in volume.

According to the Le Chatelier's principle, the favorable conditions for the formation of ammonia are,

Low temperature

The temperature should be remain as low as possible, (although at unusually low temperatures, the rate of reaction becomes slow). It has been found that the temperature, which optimizes the yield of ammonia for the reaction, is maximum at about 500°C.

High pressure

Since Haber's process proceeds with a decrease in volume, it is favored by high pressure. In actual practice, a pressure of 200 - 900 atmospheres is employed.

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

Calcium imide on hydrolysis will give gas (B) which on oxidation by bleaching powder gives gas (C). Gas (C) on reaction with magnesium gives compound (D). (D) on hydrolysis gives again gas (B). (B), (C) and (D) respectively are :

  1. ${NH _3}$, ${N _2}$, ${Mg _3N _2}$
  2. ${N _2}$, ${NH _3}$, $Mg _3N _2$
  3. ${N _2}$, ${N _2O _5}$, ${Mg(NO _3) _2}$
  4. ${NH _3}$, ${NO _2}$, ${Mg(NO _2) _2}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Reactions :
$CaNH+H _2O\rightarrow CaO+NH _3$
$3CaOCl _2 + 2NH _3\rightarrow 3CaCl _2 + 3H _2O + N _2$
$3Mg + N _2 \rightarrow Mg _3N _2$
$Mg _3N _2 + 6 H _2O \rightarrow 3Mg(OH) _2 + 2NH _3$

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

$NH _3$ can't be obtained by :

  1. heating of $NH _4NO _3$ or $NH _4NO _2$
  2. heating $NH _3CI$ or $(NH _4) _2CO _3$
  3. heating of $NH _4NO _3$ with $NaOH$
  4. reaction of $AIN$ or $Mg _3N _2$ or $CaCN _2$ with $H _2O$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Reactions are:
$NH _4NO _3\rightarrow N _2O+H _2O$
$NH _4NO _2\rightarrow N _2+H _2O$
$NH _4Cl\rightarrow NH _3+HCl$
$NH _4NO _3 (aq) + NaOH(s)\rightarrow NH _3(g) +H _2O (l)+ NaNO _3(aq)$
$CaCN _2+3H _2O\rightarrow CaCO _3+NH _3$

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

$NH _4CI(s)$ is heated in a test tube, vapours are brought in contact with red litmus paper, which changes to blue and then to red. it is because of : 

  1. formation of $NH _4OH$ and $HCI$
  2. formation of $NH _3$ and $HCI$
  3. greater diffusion of $NH _3$ than $HCI$
  4. grater diffusion of $HCI$ than $NH _3$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$NH _4Cl\xrightarrow{\Delta} NH _3+HCl$
First HCl reacts with red litmus and converts it into blue but as diffusion of ammonia is high so after that ammonia reacts with blue litmus and converts back to red.