Tag: ammonia

Quizzes (0) Questions (183)

Questions Related to ammonia

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

Ammonia can be collected by displacement of

  1. Water
  2. $Conc.{ H } _{ 2 }S{ O } _{ 4 }$

  3. Brine

  4. Mercury
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ammonia is an extremely soluble gas and cannot be collected by displacement of water or acid. It can only be collected over a liquid in which it does not dissolve. 

One such liquid is mercury because it does not react with ammonia and it can be easily collected by displacement of the metal as it is liquid at room temperature. 

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

Which of the following compounds do not give ammonia on reaction with water?

  1. ${ Mg } _{ 3 }{ N } _{ 2 }$
  2. $AlN$
  3. $CaC{ N } _{ 2 }$
  4. $Ca{ \left( CN \right) } _{ 2 }$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Calcium cyanamide (CaCN2) reacts with water to produce calcium carbonate and ammonia, but calcium cyanide (Ca(CN)2) does not produce ammonia upon hydrolysis; it typically produces hydrogen cyanide.

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

Urea is prepared by the chemical reaction of:

  1. acetamide and ethyl alcochol

  2. ammonium sulphate and calcium chloride

  3. ammonia and Carbon dioxide

  4. chlorine and water
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The chemical formula of urea is $H _2N-CO-NH _2$
Urea is now prepared commercially in vast amounts from liquid ammonia and liquid carbon dioxide.
Multiple choice chemistry nitrogen and sulfur ammonia and fertilizers preparation of ammonia-laboratory method and haber's process ammonia

For the manufacture of ammonia by the reaction$N _{2}+3H _{2} \rightleftharpoons 2NH _{3}+21.9\ K cal$, the favorable conditions are:

  1. low temperature, low pressure & catalyst

  2. low temperature, high pressure & catalyst

  3. high temperature, low pressure & catalyst

  4. low temperature, high pressure

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The equation representing habers process of ${ NH } _{ 3 }$

synthesis is-${ N } _{ 2 }(g)+{ 3H } _{ 2 }(g)\rightleftharpoons { 2NH } _{ 3 }(g)\ $
pressure: 150-200 atm
temperature : $450℃-500℃$
catalyst : Iron

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

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)

  1. $LT;LP$
  2. $LT;HP$
  3. $HT;HP$
  4. $HT;LP$
Reveal answer Fill a bubble to check yourself
A Correct answer
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$NH _3$.

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

$NH _3$ 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:

  1. 1 mol

  2. 2 mol

  3. 3 mol

  4. 4 mol
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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

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

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

  1. a primary amine

  2. a secondary amine

  3. a tertiary amine

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
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 .

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

In which reaction ammonia acts as an acid?

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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

So, it cannot act as an acid .

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.