Which of the following is the lightest gas?
1 Nitrogen
2 Hydrogen
3 Ammonia
4 Carbon dioxide
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The presence of which of the following salts in water causes corrosion in steam boilers? 1 Sodium chloride 2 Magnesium chloride 3 Calcium bicarbonate 4 Potassium bicarbonate
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Which of the following metals react with nitrogen at room temperature to form nitride? 1 Sodium 2 Potassium 3 Magnesium 4 None of these
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