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

The solution of bleaching powder in water is always a clear solution.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bleaching powder is known as calcium hypochlorite. It is marketed as bleach powder. It is white solid although commercial samples appear yellow. It is not highly soluble in water and is used in soft to medium hard water. It has two forms dry and hydrated.

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

Bleaching powder is effective with cold water, but ineffective with hot water. This is because of:

  1. oxidation of chloride radical

  2. reduction of chloride radical

  3. reduction of hypochlorite radical

  4. hydrolysis of hypochlorite radical
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Bleaching action takes place due to the hypochlorite radical [$ClO^{-}$].

But when used in hot water, hot water favours reduction of the hypochlorite radical as a result of which bleaching powder is ineffective with hot water.
Generally, Bleaching powder is used as a disinfectant widely.

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

The reaction of $NaCl$ and $CaCO _3$ gives sodium carbonate. But this reaction cannot be used for the manufacture of washing soda since it is a reversible reaction.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The reaction of $NaCl$ and $CaCO _3$ gives sodium carbonate. But this reaction cannot be used for the manufacture of washing soda since it is a reversible reaction.

$2NaCl+CaCO _3\rightleftharpoons Na _2CO _3+CaCl _2$.

Hence the given statement is True.

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

Bleaching powder is soluble in cold water giving a milky solution due to:

  1. available chlorine

  2. lime present in it

  3. calcium carbonate formation

  4. the absorption of carbon dioxide from atmosphere
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Bleaching powder on reaction with cold water form milky solution of calcium hydroxide. 

$CaOCl _2+H _2O\rightarrow Ca(OH) _2+Cl _2$

Thus because of the lime present in it, it gives a milky solution when dissolved in water.

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

Bleaching powder is obtained by the interaction of $Cl _2$ with a:

  1. dilute solution of $Ca(OH) _2$
  2. concentrated solution of $Ca(OH) _2$
  3. dry $CaO$

  4. dry slaked lime
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$Ca(OH) _2 +Cl _2 \rightarrow Ca(OCl)Cl + H _2O$
Bleaching powder is obtained by the interaction of $Cl _2$ with a dry slaked lime.

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

Bleaching powder slowly decomposes to form:

  1. $CaCl _2+Ca(ClO _3) _2$
  2. $CaO+Cl _2$
  3. $CaCl _2+Ca(OCl) _2$
  4. $CaCO _3+Cl _2$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When exposed to air, bleaching powder gives a smell of chlorine. This is because bleaching powder reacts with carbon dioxide from the atmosphere to produce calcium carbonate and chlorine.

$Ca(OCl) _2 +CO _2 \rightarrow CaCO _3 +Cl _2$

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

The average oxidation state of chlorine in bleaching power is :

  1. -1

  2. +1

  3. zero

  4. -2 as well as +2
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In bleaching powder, $Ca(OCl)Cl$, the two $Cl$ atoms are in different oxidation states i.e., one $Cl^–$ having oxidation number of –1 and the other as $OCl^–$ having oxidation number of +1.


Hence, the average oxidation state of chlorine in bleaching powder is zero.