Tag: chemical reactions

Quizzes (8) Questions (144)

Questions Related to chemical reactions

Multiple choice chemistry chemical reactions effects of oxidation reactions in daily life corrosion of metals electroplating and its application

Calcium hydroxide $\xrightarrow {\Delta}$ Calcium oxide + water. Identify the type of chemical reaction:

  1. Decomposition Reactions

  2. Neutralization Reactions

  3. Displacement Reactions

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

The reaction Ca(OH)2 -> CaO + H2O is a decomposition reaction where a single reactant breaks down into two or more simpler products upon heating.

Multiple choice chemistry chemical reactions effects of oxidation reactions in daily life corrosion of metals electroplating and its application

Balance the reaction of copper sulphide with dilute hydrochloric acid. 

  1. ${ Cu } _{ 2 }S+2HCl\rightarrow { 2CuCl }+{ H } _{ 2 }S$
  2. ${ Cu } _{ 2 }S+HCl\rightarrow { CuCl }+{ H } _{ 2 }S$
  3. ${ Cu } _{ 2 }S+HCl\rightarrow { CuCl } _{ 2 }+{ H } _{ 2 }+{S}$
  4. $2{ Cu } _{ 2 }S+2HCl\rightarrow 2{ CuCl } _{ 2 }+{ S } _{ 2 }+{H} _{2}S$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$Cu _2S+2HCl\longrightarrow 2CuCl+H _2S$

No. of Atom | No. of Atom | | --- | --- | --- | | $Cu$ |  $2$ | $2$ | | $S$ | $1$ | $1$ | | $H$ | $2$ | $2$ | | $Cl$ | $2$ | $2$ |

Multiple choice chemistry chemical reactions effects of oxidation reactions in daily life corrosion of metals electroplating and its application

Correct balanced equation from the following reactions is:

  1. $S + 3HNO _3 \rightarrow H _2SO _4 + NO _2 + 3H _2O$
  2. $S + HNO _3 \rightarrow H _2SO _4 + 2NO _2 + H _2O$
  3. $S + 3HNO _3 \rightarrow H _2SO _4 + 6NO _2 + 2H _2O$
  4. $S + 6HNO _3 \rightarrow H _2SO _4 + 6NO _2 + 2H _2O$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Reaction:
$S + 6HNO _3 \rightarrow H _2SO _4 + 6NO _2 + 2H _2O$

Multiple choice chemistry chemical reactions effects of oxidation reactions in daily life corrosion of metals electroplating and its application

Give a balanced equation for thermal dissociation of a solid [both containing the chloride ion].

  1. $2{ NH } _{ 4 }Cl\left( s \right) \rightleftharpoons { N _2H _6}\left( g \right) +2HCl\left( g \right) $
  2. ${ NH } _{ 4 }Cl\left( s \right) \rightleftharpoons { NH } _{ 3 }\left( g \right) +Cl _2\left( g \right) $
  3. ${ NH } _{ 4 }Cl\left( s \right) \rightleftharpoons { NH } _{ 3 }\left( g \right) +H _2\left( g \right) $
  4. ${ NH } _{ 4 }Cl\left( s \right) \rightleftharpoons { NH } _{ 3 }\left( g \right) +HCl\left( g \right) $
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

On heating ammonium chloride above 340$^0$C it decomposes into mixture of ammonia and hydrochloric gas. It is a reversible reaction.
${ NH } _{ 4 }Cl\left( s \right) \rightleftharpoons { NH } _{ 3 }\left( g \right) +HCl\left( g \right) $