Teaching UGC NET Mock Test Series 2025 (Paper 1 & 2) Home Science Resource Management and Consumer Issues Natural Resources Management
Permanent hardness in water is due to the presence of following salts:
A. Calcium bicarbonate
B. Magnesium bicarbonate
C. Magnesium chloride
D. Calcium nitrate
E. Calcium sulphate
Choose the correct answer from the options given below:
1
A, B and C only
2
B, C and D only
3
C, D and E only
4
A, D and E only