S Block Elements Question 124
Question: NaOH is prepared by the method
[AFMC 2005]
Options:
A) Down’s cell
B) Castner cell
C) Solvay process
D) Castner Kellner cell
Show Answer
Answer:
Correct Answer: D
Solution:
The cell involves the following reaction, $ NaCl $ ⇌ $ N{{a}^{+}}+C{{l}^{-}} $ At anode : $ 2C{{l}^{-}}\to 2Cl+2e\to Cl_2 $ At cathode : $ N{{a}^{+}}+e\to Na $
$ Na+Hg\to $ amalgam At anode : $ Na- $ amalgam $ \to N{{a}^{+}}+Hg+e $ At cathode : $ 2H_2O+2e\to H_2\uparrow +2O{{H}^{-}} $
BETA
