Chemistry
Table salt gets moist during rainy season because

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

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Chemistry
Ammonial is a mixture of

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

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