Chemistry
Which one of the following group of gases contributes to the 'Green House Effect'?

Carbon monoxide and Sulphur dioxide
Carbon tetraflouride and Nitrous oxide
Carbon dioxide and Methane
Ammonia and 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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