Chemistry
Table salt gets moist during rainy season because

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

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Chemistry
Ammonial is a mixture of

Aluminium powder and ammonium sulphate
Aluminium powder and ammonium chloride
Aluminium powder and potassium nitrate
Aluminium powder and ammonium nitrate

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