Question

a true solution of common salt, sugar and alum


with digram ​

Answer 1

• Alum (Aluminium sulphate) when added to raw water reacts with a bicarbonate alkalinities present in water and forms a gelatinous precipitate. This flow attracts other fine particles and suspended material in raw water and settles down.
• Simply, impurities are needed for conducting electricity. Impurities are reduced by adding alum to water, which makes water a poor conductor.

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