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

In Haber process 30 litres of dihydrogen and 30 litres of dinitrogen were taken for reaction which yielded only 50% of the expected product. What will be the composition of gaseous mixture under the aforesaid condition in the end?

  1. 20 litres ammonia. 20 litres nitrogen, 20 litres hydrogen

  2. 10 litres ammonia, 25 litres nitrogen, 15 litres hydrogen

  3. 20 litres ammonia, 10 litres nitrogen, 30 litres hydrogen

  4. 20 litres ammonia, 25 litres nitrogen, 15 litres hydrogen
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The reaction is N2 + 3H2 -> 2NH3. With 30L of each, H2 is the limiting reagent. Theoretical yield is 20L of NH3. At 50% yield, 10L of NH3 is produced. This consumes 5L of N2 and 15L of H2. Remaining: 25L N2, 15L H2, 10L NH3.

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

In Haber process $30L$ of Dihydrogen and $30L$ of dinitrogen were taken for reaction which yielded only $50\% $of the expected product . what will be the composition of gaseous mixture under the aforesaid condition in the end?  

  1. $20L$ ammonia $10L$ nitrogen , $30L$ hydrogen
  2. $20L$ ammonia , $125L$ nitrogen , $25L$ ydrogen
  3. $20L$ ammonia , $20L$ nitrogen , $20L$hydrogen
  4. $10L$ ammonia , $25L$nitrogen , $15L$ hydrogen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The reaction is N2 + 3H2 -> 2NH3. With 30L of each, H2 is the limiting reagent. Theoretical yield is 20L of NH3. At 50% yield, 10L of NH3 is produced. This consumes 5L of N2 and 15L of H2. Remaining: 25L N2, 15L H2, 10L NH3.

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

Which of the following when dissolved in water will liberate ammonia ?

  1. ${Na NO _3}$
  2. ${Na NO _2}$
  3. ${Na NH _2}$
  4. ${Na _3N}$
Reveal answer Fill a bubble to check yourself
C,D Correct answer
Explanation

Reactions:
$Na _3N+ 3H _2O \rightarrow 3NaOH + NH _3$
$H _2O+NaNO _3\rightarrow H _2O+NaOH+NO$
$NaNH _2+H _2O(hot) \rightarrow NaOH + NH _3$
$NaNO _2 + H _2O \rightarrow HNO _2 + NaOH$

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

Industrially, ammonia is obtained by direct combination between nitrogen and hydrogen. The formation of ammonia is promoted at:

  1. 1000 atm

  2. 200 atm

  3. 25 atm

  4. 1 atm
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ammonia is prepared industrially by Haber's process.

In this process, dinitrogen directly reacts with Dihydrogen in $1:3$ in presence of iron catalyst with promoters as oxides of potassium or aluminium.
The physical conditions required for this process are $200-300$ atm pressure and $400-450^0C$ temperature.

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

How is ammonia collected?

  1. Ammonia is less dense than air so it is collected by upward delivery.

  2. Ammonia is more dense than air so it is collected by upward delivery.

  3. Ammonia is more dense than air so it is collected by downward delivery.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ammonia is less dense than air so it is collected by upward delivery or gas syringe method.
In upward delivery method a gas jar is connected by a tube to flask that is giving off gas. The gas that is less dense than air rises to the top of gas jar. The air in the gas jar is displaced until the gas jar is filled with collected gas. Ammonia is very soluble gas so the collection apparatus should be dry and not collected over water.

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

Write the balanced equation for the preparation of $NH _3$ from ammonium chloride and calcium hydroxide.

  1. ${ 4NH } _{ 4 }Cl+Ca\left( OH \right) _{ 2 }\rightarrow 2{ NH } _{ 3 }+2{ CaCl } _{ 2 }+{ 2H } _{ 2 }O$
  2. ${ 2NH } _{ 4 }Cl+2Ca\left( OH \right) _{ 2 }\rightarrow 2{ NH } _{ 3 }+2{ CaCl } _{ 2 }+{ 2H } _{ 2 }O$
  3. ${ 2NH } _{ 4 }Cl+Ca\left( OH \right) _{ 2 }\rightarrow 2{ NH } _{ 3 }+{ CaCl } _{ 2 }+{ 2H } _{ 2 }O$
  4. ${ NH } _{ 4 }Cl+Ca\left( OH \right) _{ 2 }\rightarrow { NH } _{ 3 }+{ CaCl } _{ 2 }+{ 2H } _{ 2 }O$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

${ 2NH } _{ 4 }Cl+Ca\left( OH \right) _{ 2 }\rightarrow 2{ NH } _{ 3 }+{ CaCl } _{ 2 }+{ 2H } _{ 2 }O$

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

Which reaction of ammonia forms the first step of Ostwald's process?

  1. The catalytic oxidation of ammonia by platinum catalyst

  2. The catalytic oxidation of ammonia by cobalt catalyst

  3. The catalytic reduction of ammonia by platinum catalyst

  4. The oxidation of ammonia
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The first step of Ostwald's process is the catalytic oxidation of ammonia by platinum catalyst for the formation of nitric acid.

$NH _3+O _2 \xrightarrow {Pt} NO+ H _2O$

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

$N _2(g) + 3H _2(g)\overset{Fe+Mo}{\rightleftharpoons}2NH _3(g)$; Haber's process.

Mo is used as :

  1. a catalyst

  2. a catalytic promoter

  3. an oxidising agent

  4. a catalytic poison
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$NH _3$ is manufactured by Haber's process.
$N _2(g) + 3H _2(g)\overset{Fe+Mb}{\rightleftharpoons}2NH _3(g)$
In this process, pure nitrogen and hydrogen gases react in the ratio of $1:3$ by volume in $400^0C-500^0C$ temperature, $200-900$ atm pressure in presence of iron as catalyst and Mo as promoter.