engineering recuitment UKPSC Polytechnic Lecturer Mock Test 2024 Environmental Engineering Quality of Water

स्थायी कठोरता उत्पन्न करने के लिए उत्तरदायी यौगिक ______ है।

1
Mg(HCO3)2
2
Ca(HCO3)2 और Mg(HCO3)2 दोनों
3
Ca(HCO3)2
4
CaSO4
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