Nitrogen is used to manufacture Vanaspati ghee. Code:

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1 and 2. Water hardness is the amount of dissolved calcium and magnesium compound in the water. Hard water contains calcium and magnesium sulphate and chloride. Hence statement 1 is correct. Diamond is the hardest metal found on earth. Hence statement 2 is also correct. Air consists of 78% nitrogen, 21% oxygen and traces of water vapour, carbon dioxide and many other components. Hence statement 3 is incorrect. Hydrogen is used to manufacture Vanaspati ghee from Vanaspati oil. Hence statement 4 is also incorrect.

Nitrogen is used to manufacture Vanaspati ghee. Code:

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