Tag: ammonia

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

Which of the following reaction represents the balanced form of conversion of Ca to ammonia?

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

The balanced chemical equation for the laboratory preparation of ammonia from ammonium chloride and calcium hydroxide is 2NH4Cl + Ca(OH)2 -> CaCl2 + 2H2O + 2NH3. Option A correctly balances all atoms: 2 nitrogen, 8 hydrogen, 2 chlorine, 2 calcium, 2 oxygen. Options B-D have unbalanced stoichiometry - they don't account for the 2:1 ratio of ammonium chloride to calcium hydroxide needed.

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

Equation for the following reaction.
$Cu+{ xHNO } _{ 3 }\rightarrow Cu\left( { NO } _{ 3 } \right) _{ 2 }+{ 2H } _{ 2 }O+{ 2NO } _{ y }$
Find the value of $x$ and $y$.

  1. $x=4, y= 2$
  2. $x=1, y= 2$
  3. $x=2, y= 2$
  4. $x=4,, y= 1$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$Cu+{ 4HNO } _{ 3 }\rightarrow Cu\left( { NO } _{ 3 } \right) _{ 2 }+{ 2H } _{ 2 }O+{ 2NO } _{ 2 }$

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.