Q: 35 (NDA-I/2011)


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 :
stats: 
0,368,824,40,648,256,248

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