Tag: effects of oxidation reactions in daily life

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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) $

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

The term used to indicate the development of unpleasant smell and taste in fat and oil-containing foods due to aerial oxidation is:

  1. acidity

  2. radioactivity

  3. rabidity

  4. rancidity
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The term used to indicate the development of unpleasant smell and taste in fat and oil containing foods due to aerial oxidation is rancidity.
The process of oxidizing fatty and oily substances is called as rancidity.

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

The term 'rancidity' represents:

  1. acid rain

  2. oxidation of fatty food

  3. rottening of fruit

  4. fading of coloured clothes in the sun
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Rancidity is a very general term and in its most general meaning, it refers to the spoilage of a food in such a way that it becomes undesirable (and usually unsafe) for consumption.During the process of oxidative rancidity, oxygen molecules interact with the structure of the oil and damage its natural structure in a way that can change its odor, its taste, and its safety for consumption.

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

Some oils and fats give a bad smell and taste because of  _________ .

  1. rancidity

  2. decomposition reaction

  3. hydrogenation reaction

  4. double displacement reaction

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Rancidity is the oxidation of oils and fats changing their taste and smell. Specifically, it is the hydrolysis and/or auto-oxidation of fats into short-chain aldehydes and ketones which are objectionable in taste and odour.

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

How many molecules of $CO _2$ are formed when one molecule of $C _6H _{12}O _6$ is oxidised in our body?

  1. $4$
  2. $2$
  3. $6$
  4. $8$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
In our body, sugar $(C _6H _12O _6)$ is oxidised by the oxygen.WE breath and energy is produced. $CO _2$ is produced which we release into the atmosphere.
The reactioncan be represented by:
$C _6H _12O _6$ $+$ $6CO _2$ $\longrightarrow $  $6CO _2$ $+$ $6H _2O$ $+$ $energy$
Hence, 6 molecules of $CO _2$ is formed.