Q: 30 (CDS-I/2018)

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Which of the following substances cause temporary hardness in water?
1. Mg(HC03)2
2. Ca(HC03)2
3. CaCl2
4. MgS04
Select the correct answer using the code given below.
question_year: 
2018
question_exam: 
CDS-I
stats: 
0,56,40,8,16,16,56