Chemistry
Hard steel contains

0.01 to 0.04 per cent carbon
0.5 to 1.5 per cent carbon
0.1 to 0.4 per cent carbon
2 to 5 per cent carbon

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Chemistry
Table salt gets moist during rainy season because

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

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