Tag: substances in common use

Questions Related to substances in common use

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

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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.

When bleaching powder undergoes auto-oxidation, the change in oxidation state is:

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

  1. $+1 \ to +5$

  2. $-1\  to\  0$

  3. $+1 \ to +3$

  4. $-1\  to +3$

Show answer
Correct Option: A
Explanation:

$6Ca(OCl) _2 \rightarrow 6Ca(ClO _3) _2 + 5CaCl _2$

On treating bleaching powder with ethyl alcohol it gives chloroform.

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:

${ CaOCl } _{ 2 }+{ C } _{ 2 }{ H } _{ 5 }OH\rightarrow { CHCl } _{ 3 }+Ca{ \left( OH \right)  } _{ 2 }$

Bleaching powder is obtained by the reaction of $Cl _{2}$ with:

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

  1. dilute solution of $Ca[OH] _{2}$

  2. concentrated solution of $Ca[OH] _{2}$

  3. dry $CaO$

  4. dry slaked lime

Show answer
Correct Option: B
Explanation:

$2Cl _2 + 2Ca(OH) _2(conc.) \rightarrow Ca(OCl) _2 + CaCl _2 + 2H _2O$

State whether the given statement is true or false:

Bleaching powder contains about 50 % available chlorine.

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: B
Explanation:

Calcium hypochlorite is a relatively stable compound and has a greater available chlorine than sodium hypochlorite. It strongly smells of chlorine owing to its slow decomposition in moist air.The percentage of chlorine in bleaching powder is between range 10 % to 40%.

Hence,it is false.