Tag: ammonia and fertilizers

Quizzes (0) Questions (69)

Questions Related to ammonia and fertilizers

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

Which of the following is/are correct?

  1. Hydrolysis of $NCl _3$ gives $NH _3$ and $HClO$
  2. $NH _3$ is less stable than $PH _3$
  3. $NH _3$ is a weak reducing agent compared to $PH _3$

  4. Nitric oxide is paramagnetic
Reveal answer Fill a bubble to check yourself
A,C,D Correct answer
Explanation

A) $NCl _3$ is hydrolyzed by hot water to release ammonia and hypochlorous acid.
 $NCl _3 + 3H _2O\rightarrow NH _3 + 3HOCl$

B)  $NH _3$ is less stable than $PH _3$, because $NH _3$ is more stable than $PH _3$ due to inter molecular hydrogen bonding.
C) $NH _3$ is a weak reducing agent compared to $PH _3$, because from $NH _3$ to $PH _3$ reducing nature increases down the group.
D) Nitric oxide is paramagnetic, because it is having unpaired electrons.
Hence, options A,C & D are correct.

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

 Which compound does not give ammonia gas on reaction with water ?

  1. $ \mathrm{M}\mathrm{g} _{3}\mathrm{N} _{2}$
  2. $ \mathrm{A}\mathrm{l}\mathrm{N}$
  3. $\mathrm{C}\mathrm{a}\mathrm{C}\mathrm{N} _{2}$
  4. $\mathrm{C}\mathrm{a}(\mathrm{C}\mathrm{N}) _{2}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
$Mg _3N _2 + 6H _2O \longrightarrow3Mg(OH) _2 + 2NH _3$

$AlN + 3H _2O \longrightarrow NH _3 + Al(OH) _3$

$2H _2O + Ca(CN) _2 \longrightarrow Ca(OH) _2 + 2HCN$

$CaCN _{2} + 3H _{2}O\longrightarrow$ $CaCO _{3} + 2NH _{3}$

$Ca(CN) _2$ does not produce ammonia on reacting with water.
Multiple choice chemistry nitrogen and sulfur ammonia and fertilizers preparation of ammonia-laboratory method and haber's process ammonia

Assertion (A): In the synthesis of ammonia by Haber's process, mixture of potassium and aluminium oxides can be used as promoter.
Reason (R): Promoter enhances the activity of catalyst.

  1. Both (A) and (R) are true and (R) is the correct explanation of (A)

  2. Both (A) and (R) are true and (R) is not the correct explanation of (A)

  3. (A) is true and (R) is false

  4. (A) is false but (R) is true
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Promoter enhances the activity of catalyst (here iron), and because of which potassium and aluminium oxides are used as promoter in Haber's process.

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

Assertion (A): A mixture of $CaCN _2$ and graphite is known as nitration mixture.
Reason (R) : $NH _3$ is collected by downward displacement of air.

  1. Both (A) and (R) are true and (R) is the correct explanation of (A)

  2. Both (A) and (R) are true and (R) is not the correct explanation of (A)

  3. (A) is true and (R) is false

  4. (A) is false but (R) is true
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$HNO _{3}+H _{2}SO _{4}$ is known as nitration mixture. So, A is wrong.
$NH _{3}$ is collected by downward displacement of air as $NH _{3}$ is lighter than air.

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

In Haber process of  Ammonia production the element used as catalytic promoter to increase the activity of Iron catalyst is .......................

  1. NI (Nickel)

  2. W (Tungston)

  3. V (Vanadium)

  4. Mo (Molybednum)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In Haber process of  ammonia production the element used as catalytic promoter to increase the activity of Iron catalyst is Mo (Molybednum).
$N _2+3H _2  \rightleftharpoons 2NH _3 + 24 \quad kcal$
The temperature is $450^oC$ and  the pressure is 200-250 atm.

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

The wrong statements about $\displaystyle NH _{3}$ is :

  1. it is oxidised with oxygen at $\displaystyle 700^{\circ}C$ in the presence of platinum

  2. it gives black precipitate with calomel
  3. it can be dried by $\displaystyle P _{2}O _{5},\ H _{2}SO _{4}\, $and$\, CaCl _{2}$

  4. it gives white fumes with HCI
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
$NH _3$ is oxidised to nitric oxide and water with oxygen at $700^oC $ in the presence of platinum.
Aqueous ammonia reacts with calomel $Hg _2Cl _2$ to produce metallic mercury, a black precipitate. 
$CaO$ calcium oxide is used for drying of ammonia. Because $CaO$ being basic in nature does not react with $NH _3$ while $P _2O _5, $ conc. $H _2SO _4 \ $and$ \ CaCl _2$ reacts with it.
$CaO + H _2O + NH _3 \rightarrow NH _3 + Ca(OH) _2$
$CaCl _2 + 8NH _3 \rightarrow CaCl _2.8NH _3$
$P _2O _5 + 3H _2O + 6NH _3 \rightarrow 2(NH _4) _3PO _4$
$H _2SO _4 + NH _3 \rightarrow (NH _4) _2SO _4$
$NH _3$ gives White fumes of $NH _4Cl$ with $HCl$.
Multiple choice chemistry nitrogen and sulfur ammonia and fertilizers preparation of ammonia-laboratory method and haber's process ammonia
Nitrogen reacts with a metal $M$ to produce a compound $X$. This compound $X$ when dissolved in water forms pungent gas $Y$ which can be identified easily by the formation of white fumes in the presence of $HCl$.

Identify Y:

  1. Nitrogen dioxide

  2. Ammonia

  3. Nitrous oxide

  4. Nitric oxide
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
$ 3Ca+{ N } _{ 2 }\xrightarrow [ \Delta  ]{  } { Ca } _{ 3 }{ N } _{ 2 } $

$ { Ca } _{ 3 }{ N } _{ 2 }+6{ H } _{ 2 }O\xrightarrow [  ]{  } 3Ca{ (OH) } _{ 2 }+2N{ H } _{ 3 } $
From the reaction we can see that the metal $ M $ is $Ca$ and pungent gas $ Y $ is Ammonia.