sblock Elements 2 Question 15
15. Calcium is obtained by
(1980, 1M)
(a) electrolysis of molten $\mathrm{CaCl}_2$
(b) electrolysis of solution of $\mathrm{CaCl}_2$ in water
(c) reduction of $\mathrm{CaCl}_2$ with carbon
(d) roasting of limestone
Show Answer
Answer:
Correct Answer: 15. (a)
Solution: Electrolysis of molten $\mathrm{CaCl}_2$ gives calcium at cathode
$ \mathrm{Ca}^{2+}+2 e^{-} \longrightarrow \mathrm{Ca} \quad \text { (at cathode) } $
In case of electrolysis in aqueous medium, less electropositive $\mathrm{H}^{+}$is reduced at cathode rather than $\mathrm{Ca}^{2+}$.
BETA
