Chemistry
Which one of the following contributes largely to the ‘green house effect’ ?

Carbon dioxide
Water vapour
Carbon monoxide
Ozone

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Chemistry
Table salt gets moist during rainy season because

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

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