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CHEMICAL PROCESS

Chemical Process
Temporary hardness of water can be removed by

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

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Chemical Process
Permanent hardness of water can be removed by

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

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Chemical Process
Esterification reaction

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

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Chemical Process
Cooking liquor in case of sulphite process is

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

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Chemical Process
The main component of pyrex glass is

Boron
Celenium
Zinc
Lead

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