Tag: chemical from common salt

Questions Related to chemical from common salt

Which of the following has the strongest bleaching property?

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

  1. Chlorine

  2. Fluorine

  3. Bromine

  4. Iodine

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Correct Option: A
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. 

Which one of the following is a correct statement?

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

  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

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Correct Option: A
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.

The real bleaching agent present in bleaching powder is:

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

  1. chlorine

  2. oxygen

  3. CaO

  4. None of the above

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Correct Option: A
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.

Bleaching powder is:

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

  1. $CaO _2Cl$

  2. $CaOCl _2$

  3. $CaClO _2$

  4. $CaCl _2+O _2$

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Correct Option: B
Explanation:

The correct formula for Bleaching powder is CaOCl2. One chlorine is directly bonded to calcium while other to the oxygen atom.

What is used as a bleaching linen, wood pulp and washed clothes in laundry?

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

  1. Baking soda

  2. Washing soda

  3. Bleaching powder

  4. Plaster of paris

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Correct Option: C
Explanation:

Bleaching powder is used as bleaching linen, wood pulp and washed clothes in laundry.

Calcium hydroxide react with chlorine to form:

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

  1. bicarbonate

  2. bleaching powder

  3. baking soda

  4. washing soda

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Correct Option: B
Explanation:

Calcium hypochlorite is an inorganic compound with formula $Ca(ClO) _2$. Calcium hydroxide and chlorine form bleaching powder. 

Formula of calcium hypochlorite is:

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

  1. $CO{ Cl } _{ 2 }$

  2. $Ca{ \left( ClO \right) } _{ 2 }$

  3. $Ca{ \left( Cl{ O } _{ 3 } \right) } _{ 2 }$

  4. $Ca{ \left( Cl{ O } _{ 4 } \right) } _{ 2 }$

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Correct Option: B
Explanation:

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

Bleaching powder loses ___________ by the action of dilute acids in excess.

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

  1. oxygen

  2. calcium

  3. chlorine

  4. water

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Correct Option: C
Explanation:

Reaction of bleaching powder with $dil.HCl$:

$CaOCl _2 + 2HCl \rightarrow CaCl _2 + Cl _2 + H _2O$  

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

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

  1. $Ca(ClO _3) _2, CaCl _2$

  2. $CaO, CaCl _2$

  3. $CaClO, CaClO _3$

  4. $CaClO _2, CaCl _2$

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Correct Option: A
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 $CaOCl _2$

Uses of bleaching powder is/are:

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

  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

Show answer
Correct Option: A,C,D
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.