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

State whether the given statement is true or false:

Bleaching powder contains about 50 % available chlorine.

  1. True

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

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.

  1. True

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

On long standing, bleaching powder undergoes auto-oxidation which results in the formation of calcium chloride and calcium chlorate.


$6 CaOCl _2 \rightarrow5CaCl _2   + 6 Ca(ClO3) _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

Substance $X$:
(I) reacts with $H _2S$ to produce white turbidity.
(II) changes light green solution of $FeSO _4$ into yellow colour.
(III) reacts with moisture to give pungent smelling gas.
Hence $X$ is:

  1. $KMnO _4$
  2. $K _2Cr _2O _7$
  3. $SO _2$
  4. $CaOCl _2$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$CaOCl _2+H _2O\rightarrow Ca(OH) _2+\underset {(\text {Pungent smelling gas})}{Cl _2}\uparrow$
$H _2S+Cl _2\rightarrow 2HCl+\underset {(\text {White turbidity})}{S}$
$\underset {(\text {Light green})}{2FeSO _4}+H _2SO _4+Cl _2\rightarrow Fe _2(SO _4) _3+2HCl$

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

The bleaching property of chlorine water is due to:

  1. formation of nascent oxygen

  2. formation of nascent chlorine
  3. formation of ${O} _{3}$
  4. reducing property of ${Cl} _{2}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
${ Cl } _{ 2 }+{ H } _{ 2 }O\rightarrow HCl+HOCl\rightarrow 2HCl+\left[ 0 \right] $
$\left[ 0 \right] $-Nascent oxygen
Chlorine water act as strong oxidizing agent because of nascent oxygen produced in water.