Tag: chemical reactions

Questions Related to chemical reactions

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

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

  1. Decomposition Reactions

  2. Neutralization Reactions

  3. Displacement Reactions

  4. Combination Reactions

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Correct Option: A

Balance the reaction of copper sulphide with dilute hydrochloric acid. 

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

  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. $2{ Cu } _{ 2 }S+2HCl\rightarrow 2{ CuCl } _{ 2 }+{ S } _{ 2 }+{H} _{2}S$

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Correct Option: A
Explanation:

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

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

Correct balanced equation from the following reactions is:

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

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

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Correct Option: D
Explanation:

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

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

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

  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) $

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Correct Option: D
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) $