Chemistry
Table salt gets moist during rainy season because

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

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Chemistry
Antacid tablets consist of

Hydroxides of sodium and aluminium
Hydroxides of magnesium and sodium
Hydroxides of magnesium and aluminium
Hydroxides of sodium, magnesium and aluminium

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