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CDS I 2018 GK Q30

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1. Which of the following substances cause temporary hardness in water? 1. Mg(HCO3)2 2. Ca(HCO3)2 3. CaCl2 4. MgSO4. Select the correct answer using the code given below.

3 and 4

2 and 3

1 and 4

1 and 2

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CDS I 2018 GK Q30

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