Tag: some useful compounds in everyday life

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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.

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

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 :

  1. $CaO$
  2. $CaCl _{2}$
  3. $Ca(OCl)Cl$
  4. $CaCO _{3}$
Reveal answer Fill a bubble to check yourself
D Correct answer
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 : $Ca(HCO _3) _2$                    $CaCO _3+H _2O+CO _2\rightarrow Ca(HCO _3) _2$
Multiple choice chemistry substances in common use chemical from common salt compounds of carbon some useful compounds in everyday life

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

  1. For decolourising sugar

  2. For bleaching paper pulp

  3. For sterilizing water

  4. For making chloroform
Reveal answer Fill a bubble to check yourself
A Correct answer
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.