Teaching UGC NET Mock Test Series 2025 (Paper 1 & 2) People Development & Environment Environmental Issues Pollution
Which of the following statements are true about hardness in water?
(A) It is caused by ions of calcium and magnesium
(B) It is of two types-temporary and permanent
C) Permanent hardness can easily be removed by heating the water
(D) Hardness causes scales in hot water pipe systems
(E) Hardness decreases the soap consumption
Choose the correct answer from the options given below:
1
(A), (B), (C) and (D) Only
2
(A), (B) and (D) Only
3
(B), (C), (D) and (E) Only
4
(C), (D) and (E) Only