1. The hardness of water is due to the presence of
(a) Na+ and K+ (b) Na+ and Al3+
(c) K+ and Ca2+ (d) Ca2+ and Mg2+
Ans. (d)
2. Which of the following causes permanent hardness
(a) NaCl (b) MgCl2 (c) KCl (d) MgCO3
Ans. (b)
3. Which of the following causes temporary hardness
(a) NaCl (b) MgCl2 (c) KCl (d) MgCO3
Ans. (d)
4. Which of the following does not cause permanent hardness
(a) NaCl (b) MgCl2 (c) CaCl2 (d) MgSO4
Ans. (a)
(a) Na+ and K+ (b) Na+ and Al3+
(c) K+ and Ca2+ (d) Ca2+ and Mg2+
Ans. (d)
2. Which of the following causes permanent hardness
(a) NaCl (b) MgCl2 (c) KCl (d) MgCO3
Ans. (b)
3. Which of the following causes temporary hardness
(a) NaCl (b) MgCl2 (c) KCl (d) MgCO3
Ans. (d)
4. Which of the following does not cause permanent hardness
(a) NaCl (b) MgCl2 (c) CaCl2 (d) MgSO4
Ans. (a)
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