Chemistry
Sour taste of lemon is due to the presence of which of the following ?

Formic acid
Citric acid
Acetic acid
Oxalic acid

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Chemistry
Table salt gets moist during rainy season because

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

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