Tag: substances in common use

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Questions Related to substances in common use

Multiple choice chemistry substances in common use chemical from common salt compounds of carbon some useful compounds in everyday life

Which of the following has the strongest bleaching property?

  1. Chlorine

  2. Fluorine

  3. Bromine

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

Chlorine is strongest bleaching property.

Chlorine is a very strong oxidizing agent, which is used commercially as a bleaching agent and as a disinfectant, It is strong enough to oxidize the dyes that give wood pulp its yellow or brown color, for example, thereby bleaching out this color, and strong enough to destroy bacteria and thereby acts as a germicide. 

Multiple choice chemistry substances in common use chemical from common salt compounds of carbon some useful compounds in everyday life

Which one of the following is a correct statement?

  1. Bleaching powder is a compound

  2. Bleaching powder is mixture of calcium chloride and calcium hypochloride

  3. Bleaching powder is a mixture of calcium chloride,calcium hypochlorite and slaked lime

  4. Bleaching powder is a mixture of sodium chloride and sodium hypochloride
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Calcium hypochlorite is an inorganic compound with formula $Ca(ClO) _2$. As a mixture with lime and calcium chloride, it is marketed as chlorine powder or bleach powder for water treatment and as a bleaching agent.
Multiple choice chemistry substances in common use chemical from common salt compounds of carbon some useful compounds in everyday life

The real bleaching agent present in bleaching powder is:

  1. chlorine

  2. oxygen

  3. CaO

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Calcium oxychloride (CaOCl2) is known as bleaching powder. In the presence of small amount of dilute acid, it gives nascent oxygen which acts as an oxidising and bleaching agent. When it is treated with excess of dilute acids, chlorine is evolved which is responsible for the bleaching action of bleaching power.

Multiple choice chemistry substances in common use chemical from common salt compounds of carbon some useful compounds in everyday life

Formula of calcium hypochlorite is:

  1. $CO{ Cl } _{ 2 }$
  2. $Ca{ \left( ClO \right) } _{ 2 }$
  3. $Ca{ \left( Cl{ O } _{ 3 } \right) } _{ 2 }$
  4. $Ca{ \left( Cl{ O } _{ 4 } \right) } _{ 2 }$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Formula of $calcium : hypochlorite$ is $\displaystyle Ca(ClO) _2$
$\displaystyle CaOCl _2$ represents $\displaystyle calcium : chlorohypochlorite$. It is known as $\displaystyle bleaching : powder$.

Multiple choice chemistry substances in common use chemical from common salt compounds of carbon some useful compounds in everyday life

On long standing, bleaching powder undergoes auto-oxidation into:

  1. $Ca(ClO _3) _2, CaCl _2$
  2. $CaO, CaCl _2$
  3. $CaClO, CaClO _3$
  4. $CaClO _2, CaCl _2$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

On long standing, bleaching powder undergoes auto-oxidation into calcium chlorate $Ca(ClO _3) _2$ and $ CaCl _2$.
 $6CaOCl _2 \rightarrow 6 Ca(ClO _3) _2  + 5 CaCl _2$.
The bleaching powder is $CaOCl _2$

Multiple choice chemistry substances in common use chemical from common salt compounds of carbon some useful compounds in everyday life

Uses of bleaching powder is/are:

  1. It is used as a disinfectant in sterilization of water

  2. It is used to bleach straw, ivory

  3. It is used as an oxidising agent in industry

  4. It is used for making wool unshrinkable
Reveal answer Fill a bubble to check yourself
A,C,D Correct answer
Explanation

Following are the uses of bleaching powder.
(A) It is used as a disinfectant in sterilization of water
(C) It is used as an oxidising agent in many chemical reactions in industry
(D) It is used for making wool unshrinkable
Bleaching powder is useful in preparation of organic solvent chloroform which is also used as an anesthetic.
Bleaching action is possible on cotton in textile industry, wood pulp in paper factories and washed clothes in laundary.