Chemistry
Tar roads get damaged if there is

Stagnation of water on road
No maintenance
No sloping
Heavy traffic

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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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Chemistry
Aqua regia is a 1 : 3 mixture, by volume, of

Conc. nitric acid and conc. sulphuric acid
Conc. sulphuric acid and conc. nitric acid
Conc. nitric acid and conc. hydrochloric acid
Conc. hydrochloric acid and conc. nitric acid

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