Tag: preparation of ammonia-laboratory method and haber's process

Questions Related to preparation of ammonia-laboratory method and haber's process

As per Braun's principle, yield of Ammonia will be more in Haber's process under ______, conditions ($L=$ Low; $H=$ high; $T=$ Temp; $P=$ Pressure)

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

  1. $LT;LP$

  2. $LT;HP$

  3. $HT;HP$

  4. $HT;LP$

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Correct Option: A
Explanation:

The manufacture of $NH _3$ by Haber's process is given as

${ N } _{ 2 }(g)+{ 3H } _{ 2 }(g)\rightleftharpoons { 2NH } _{ 3 }(g)\ \triangle 6H°=-92.4\ $
so, it is an exothermic reversible reaction and occurs with decrease in volume.
so, the low temperature will favour the forward reaction which is exothermic in nature
and since the reaction occurs with a decrease in volume .so, high pressure will favour the formation of of$NH _3$.

$NH _3$ is formed in the following steps
I. $Ca+2C\rightarrow CaC _2$    50% yield
II. $CaC _2+N _2\rightarrow CaCN _2+C$   100% yield
III. $CaCN _2+3H _2O\rightarrow 2NH _3+CaCO _3$        50% yield
To obtain 2 moles $NH _3$, calcium required is:

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

  1. 1 mol

  2. 2 mol

  3. 3 mol

  4. 4 mol

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Correct Option: A
Explanation:

It can be easily observed from the reaction given that 1mole of Ca is required to get 2 moles of $NH _3$

An alkyl halide reacts with alcoholic ammonia in a sealed tube, the product formed will be

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

  1. a primary amine

  2. a secondary amine

  3. a tertiary amine

  4. All of the above

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Correct Option: D
Explanation:

When alkyl halide reacts with ammonia , it gives primary amine .

Reaction doesn't stop there and primary amine further gives secondary amine .
Secondary gives tertiary .
Hence mixture of three is formed .

In which reaction ammonia acts as an acid?

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

  1. ${NH} _{3}+HCl\rightarrow {NH} _{4}Cl$

  2. ${NH} _{3}+{H}^{+}\rightarrow {NH} _{4}^{+}$

  3. ${NH} _{3}+Na\rightarrow Na{NH} _{2}+\cfrac{1}{2}{H} _{2}$

  4. ${NH} _{3}$ cannot act as an acid

Show answer
Correct Option: D
Explanation:

$NH _3$  is a strong base due to high electron density on nitrogen 

So, it cannot act as an acid .

Which one of the following compounds on strong heating evolves ammonia gas?

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

  1. $(NH _{4}) _{2}SO _{4}$

  2. $NH _4NO _{3}$

  3. $(NH _{4}) _{2}Cr _{2}O _{7}$

  4. $NH _{4}NO _{2}$

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Correct Option: A
Explanation:

Ammonia is obtained by heating ammonium sulphate.
$(NH _4) _2SO _4 \rightarrow NH _3 + NH _4HSO _4$

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

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

  1. True

  2. False

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Correct Option: A
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.

The compound that produces ammonia when treated with sodamide is 

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

  1. $CH _{3}-CH _{2}-CH=CH _{2}$

  2. $CH _{3}-C\equiv C-CH _{3}$

  3. $CH _{2}=CH-CH=CH _{2}$

  4. $CH _{3}-CH _{2}-C\equiv CH$

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Correct Option: C

Two major requirements for preparation of ammonia are

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

  1. Low temperature and high pressure

  2. Low temperature and present pressure

  3. High temperature and low pressure

  4. High temperature and high pressure

Show answer
Correct Option: A
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.

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 :

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

  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. ${NH _3}$, ${NO _2}$, ${Mg(NO _2) _2}$

Show answer
Correct Option: A
Explanation:

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

Natural gas is a major feed stock for the production of ________

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

  1. Ammonia

  2. potassium

  3. sodium

  4. phosphorus

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Correct Option: A