Tag: some useful compounds in everyday life

Questions Related to some useful compounds in everyday life

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

Show answer
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. $CaClO _2, CaCl _2$

Show answer
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.

Bleaching powder loses oxygen in the presence of:

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

  1. calcium chloride

  2. cobalt chloride

  3. sodium chloride

  4. none of the above

Show answer
Correct Option: B
Explanation:

Bleaching powder loses oxygen in the presence of  cobalt chloride catalyst.
$2CaOCl _2 \xrightarrow {CoCl _2} 2CaCl _2 + O _2$

The colour of bleaching powder is :

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

  1. green

  2. pale yellow

  3. blue

  4. white

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Correct Option: B
Explanation:

Bleaching powder is a yellowish white powder which gives a strong smell of chlorine.

When treated with $conc. HCl, MnO _{2}$ yields a gas $(X)$ which further reacts with $Ca(OH) _{2}$ to generate a white solid $(Y)$. The solid $Y$ reacts with $dil. HCl$ to produce the same gas $X$. The solid $Y$ is :

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

  1. $CaO$

  2. $CaCl _{2}$

  3. $Ca(OCl)Cl$

  4. $CaCO _{3}$

Show answer
Correct Option: D
Explanation:
X : Carbon dioxide              $CaCO _3+HCl  \rightarrow CaCl _2+ H _2O+CO _2$     
Y : Calcium Carbonate      $Ca(OH) _2 + CO _2 \rightarrow CaCO _3 + H _2O$
Z : $Ca(HCO _3) _2$                    $CaCO _3+H _2O+CO _2\rightarrow Ca(HCO _3) _2$

Bleaching powder is used for disinfecting drinking water.

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

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Bleaching powder, $CaOCl _2$ or calciumoxychloride is used to kill germs and bacteria of water because it contains chlorine element, which is good disinfecting agent.

Bleaching powder has several uses, some of which are mentioned here. Pick the false one.

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

  1. For decolourising sugar

  2. For bleaching paper pulp

  3. For sterilizing water

  4. For making chloroform

Show answer
Correct Option: A
Explanation:

Bleaching powder is used for bleaching dirty clothes in the laundry, as a bleaching agent for cotton and linen in the textile industry. It is a strong oxidizing agent hence used as an oxidizer in many industries. It is used as a disinfectant which is used for disinfecting water to make potable water.It is also used for bleaching paper pulp,sterilizing water,making chloroform.

It is not used to decolourize sugar and hence option A is false one.

Which of the following can act as a catalyst in the decomposition of bleaching powder?

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

  1. Cobalt chloride

  2. Cobalt

  3. Chlorine

  4. None of the above

Show answer
Correct Option: A,B
Explanation:

Heavy metals like Ni, Co, Mn, Cu and their chlorides accelerate the decomposition of bleaching powder.