Chemistry
The constituents of automobile exhaust that can cause cancer is/are :

Carbon monoxide
Oxides of nitrogen
Lead
Polycyclic hydrocarbons

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Chemistry
Table salt gets moist during rainy season because

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

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