Chemistry

Chemical Reactions and Equations

684 Questions

Chemical reactions and equations form a foundational chemistry topic where students identify reaction products, balance chemical formulas, and classify reaction types. It covers critical mechanisms like Markovnikov's rule, precipitation, and endothermic or exothermic processes. These questions are highly common in general science sections of state and central government competitive exams.

Endothermic reactionsPrecipitation reactionsDehydrohalogenation of alkyl halidesChemical equation balancingReaction product identification

Chemical Reactions and Equations Questions

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

Ammonia reacts with excess of chlorine to form :

  1. ${ N } _{ 2 }+N{ H } _{ 4 }Cl$
  2. $N{ Cl } _{ 3 }$ and $HCl$
  3. $N{ H } _{ 4 }Cl$ and $N{ Cl } _{ 3 }$
  4. ${ N } _{ 2 }$ and $HCl$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pure chlorine gas may react vigorously with ammonia gas. An excessive mix of the two gases in air can produce hazardous compounds such as nitrogen trichloride.

The following reaction takes place:

$N{ H } _{ 3 }+3{ Cl } _{ 2 }\longrightarrow N{ Cl } _{ 3 }+3HCl$

Ammonia reacts with excess of chlorine to form $ N{ Cl } _{ 3 } $ and $ HCl $.

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

Identify the probable products for the reaction of $N{ H } _{ 3 }$ with ${ Cl } _{ 2 }$.

  1. ${ N } _{ 2 }$ and $N{ H } _{ 4 }Cl$
  2. $N{ Cl } _{ 3 }$ and $HCl$
  3. ${ N } _{ 2 }$ and $N{ Cl } _{ 3 }$
  4. $N{ H } _{ 4 }Cl$ and $HCl$
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

Possible reactions of $N{ H } _{ 3 }$ and ${ Cl } _{ 2 }$ are :

  1. $N{ H } _{ 3 }+{ Cl } _{ 2 }\longrightarrow { N } _{ 2 }+N{ H } _{ 4 }Cl$
  2. $N{ H } _{ 3 }+{ Cl } _{ 2 }\longrightarrow N{ C }l _{ 3 }+HCl$

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

Identify the probable products for the reaction of $NH _{3}$ with $Cl _{2}$.

  1. $N _{2}$ and $NH _{4}Cl$
  2. $NCl _{3}$ and $HCl$
  3. $N _{2}$ and $NCl _{3}$
  4. $NH _{4}Cl$ and $HCl$
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

If $NH _3$ is in excess then $8NH _3 + 3Cl _2 \rightarrow 6NH _4Cl + N _2$
If $Cl _2$ is in excess then $NH _3 + 3Cl _2 \rightarrow NCl _3 + 3HCl$

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

Chlorine reacts with excess of ammonia to form:

  1. ${ NH } _{ 4 }Cl$
  2. ${ N } _{ 2 }+HCl$
  3. ${ N } _{ 2 }+{ NH } _{ 4 }Cl$
  4. ${ N } _{ 2 }+{ HCl} _{ 3 }$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pure chlorine gas may react vigorously with ammonia gas. An excessive mix of the two gases in the air can produce hazardous compounds such as the explosive nitrogen trichloride. In facilities that use chloramination, the pure chlorine and ammonia need to be stored in separate, sealed rooms or buildings.

When ammonia is excess,

$3 Cl _2 + 8 NH _3 \rightarrow 6 NH _4Cl + N _2 (g)$

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

Give balanced equation for reaction in which $NH _3$ is oxidized by a gas which is not oxygen.

  1. $8{ NH } _{ 3 }+{ 3Cl } _{ 2 }\rightarrow 6{ NH } _{ 4 }Cl+2{ N } _{ 2 }$
  2. $4{ NH } _{ 3 }+{ 3Cl } _{ 2 }\rightarrow 3{ NH } _{ 4 }Cl+{ N } _{ 2 }$
  3. $8{ NH } _{ 3 }+{ 3Cl } _{ 2 }\rightarrow 6{ NH } _{ 4 }Cl+{ N } _{ 2 }$

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ammonia is oxidised by chlorine gas.
$8{ NH } _{ 3 }+{ 3Cl } _{ 2 }\rightarrow 6{ NH } _{ 4 }Cl+{ N } _{ 2 }$

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

Give a balanced reaction in which ammonia is oxidised by a metal oxide.

  1. ${ 4NH } _{ 3 }+3CuO\rightarrow 2{ N } _{ 2 }+{ 3H } _{ 2 }O+3Cu$
  2. ${ 2NH } _{ 3 }+4CuO\rightarrow { N } _{ 2 }+{ 3H } _{ 2 }O+4Cu$
  3. ${ 2NH } _{ 3 }+CuO\rightarrow { N } _{ 2 }+{ 3H } _{ 2 }O+Cu$
  4. ${ 2NH } _{ 3 }+3CuO\rightarrow { N } _{ 2 }+{ 3H } _{ 2 }O+3Cu$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

${ 2NH } _{ 3 }+3CuO\rightarrow { N } _{ 2 }+{ 3H } _{ 2 }O+3Cu$

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

$\displaystyle Al{ Cl } _{ 3 }\left( aq \right) +{ NH } _{ 3 }\left( aq \right) + { H } _{ 2 }O\rightarrow $
Which of the following is one of the products obtained from the reaction above?

  1. $\displaystyle AlN$
  2. $\displaystyle Al{ H } _{ 3 }$
  3. $\displaystyle Al$
  4. $\displaystyle { Al\left( { NO } _{ 3 } \right) } _{ 3 }$
  5. $\displaystyle { Al\left( OH \right) } _{ 3 }$
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

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

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

When excess of ammonia is used:


 $3Cl _2+8NH _3$$\longrightarrow$$A+B$

When excess of chlorine is used:

$3Cl _2+4NH _3$$\longrightarrow$$C+D$

The oxidation state of nitrogen in compound $D$ is:

  1. $0$
  2. $+3$
  3. $-3$
  4. $+1$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When excess chlorine reacts with ammonia (3Cl2 + 4NH3), the products are nitrogen trichloride (NCl3) and HCl. In NCl3, nitrogen is bonded to three more electronegative chlorine atoms, giving nitrogen an oxidation state of +3.