Chemistry
Chemical composition of cement is

Clay and Gypsum
Limestone and Clay
Limestone and Gypsum
Limestone, Clay and Gypsum

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Chemistry
Table salt gets moist during rainy season because

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

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