Chemistry
Table salt gets moist during rainy season because

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

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Chemistry
Metal are good conductors, because

The molecules in them are very close to each other
They contain reflecting surface
They contain free electrons
The molecules in them collide very freely

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