Chemistry
The property of hydrogen which distinguishes it from alkali metals is

Its non-metallic character
Its affinity for non-metal
Its reducing character
Its electropositive character

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Chemistry
Table salt gets moist during rainy season because

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

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