The Sblock Elements Ques 31
31. Sodium is made by the electrolysis of a molten mixture of about $40 \% NaCl$ and $60 \% CaCl_2$ because
[1995]
(a) $Ca^{2+}$ can reduce $NaCl$ to $Na$
(b) $Ca^{2+}$ can displace $Na$ from $NaCl$
(c) $CaCl_2$ helps in conduction of electricity
(d) this mixture has a lower melting point than $NaCl$
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Solution:
- (d) Sodium is obtained by electrolytic reduction of its chloride. Melting point of chloride of sodium is high $(803^{\circ} C)$ so in order to lower its melting point $(600^{\circ} C)$, calcium chloride is added to it.
BETA
