Chemistry
The filter over which sewage is sprinkled is called as

Trickling filter
Intermittent sand filter
Contact bed
Percolating filter

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Chemistry
Table salt gets moist during rainy season because

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

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