Chemistry
Ferrous sulphate is used in water treatment as a/an

Coagulant aid
Reducing agent
Oxidizing agent
Adsorbent

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Chemistry
Table salt gets moist during rainy season because

Sodium chloride is deliquescent
Sodium chloride contains some quantity of sodium iodide
Sodium chloride contains hygroscopic impurities like magnesium chloride
Sodium chloride is hygroscopic

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