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CHEMICAL PROCESS

Chemical Process
Temporary hardness of water can be removed by

Addition of lime
Addition of alum (a coagulant)
Boiling
Filtration (through gravity sand filter)

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Chemical Process
Permanent hardness of water can be removed by

All of these
Simply boiling
Adding alum
Passing it through cation & anion exchangers

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Chemical Process
Esterification reaction

Is reversible
Is a reaction between an alcohol and an organic acid
Produces soap
All of these

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Chemical Process
Cooking liquor in case of sulphite process is

None of these
Magnesium sulphate and magnessium bicarbonate
Sodium sulphite and sodium bisulphite
Magnesium sulphite and free SO₂ in acid medium

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Chemical Process
The main component of pyrex glass is

Celenium
Lead
Boron
Zinc

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