UPSC NDA I 2011 General Ability Paper
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Question : 140 of 150
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Which of the statements given below is/are correct Permanent hardness of water is due to the presence of soluble:
1. chloride of calcium.
2. bicarbonate of calcium.
3. sulphate of magnesium.
4. bicarbonate of magnesium.
Select the correct answer using the code given below:
1. chloride of calcium.
2. bicarbonate of calcium.
3. sulphate of magnesium.
4. bicarbonate of magnesium.
Select the correct answer using the code given below:
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