$CATEGORY: Science - Khan Academy/2.Acids, Bases and Salts/2.Acids, Bases and Salts--More About Salts

//Multiple Choice

The chemical name of bleaching powder is\:
{
~ Calcium hydroxide
= Calcium hypochlorite
~ Calcium carbonate
~ Sodium hypochlorite
}

The chemical formula of bleaching powder is\:
{
~ Ca(OH)₂
~ CaCO₃
= Ca(OCl)₂
~ CaCl₂
}

Bleaching powder is manufactured by passing chlorine gas over\:
{
~ Calcium oxide
= Calcium hydroxide
~ Sodium hydroxide
~ Limewater
}

Bleaching powder is used to disinfect\:
{
~ Air
= Water
~ Metals
~ Plastics
}

Which of the following is not a use of bleaching powder?
{
~ Disinfecting water
= Making plastics
~ Bleaching clothes
~ Making chloroform
}

//True or False

Bleaching powder is used as a disinfectant. {T}

The chemical formula of bleaching powder is Ca(OH)₂. {F}

Bleaching powder is prepared by reacting chlorine with slaked lime. {T}

Bleaching powder is insoluble in water. {T}

Bleaching powder is used in the preparation of chloroform. {T}

//Fill in the blanks

The common name of calcium hypochlorite is ______.
{
= Bleaching powder
~ Washing Soda
~ Baking Soda
}

Bleaching powder is produced by the reaction of chlorine with ______.
{
= Calcium hydroxide
~ Sodium hydroxide
~ Calcium
}

The chemical formula of bleaching powder is ______.
{
= Ca(OCl)₂
~ Ca(OCl)3
~ Ca(OCl)4
}

Bleaching powder is widely used for ______ water.
{
= Disinfecting
~ Heating
~ Cooling
}

Bleaching powder releases ______ gas when exposed to air.
{
= Chlorine
~ Hydrogen
~ Nitrogen
}


//Numericals



//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Chemical formula of bleaching powder -> Ca(OCl)₂
=Chlorine gas + slaked lime -> Ca(OH)₂ + Cl₂ → Ca(OCl)₂
=Use in bleaching clothes -> Removes stains
=Release of chlorine gas -> Oxidizing agent
=Use in water treatment -> Disinfecting water
}


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