KVPY 2019 SB SX Exam Previous Papers

Question : 60 of 120

Marks: +1, -0

Electrolysis of a concentrated aqueous solution of NaCl results in

Solution:

Electrolysis of can centrated NaCl.
Cathode ⇒

2H _2O+ 2e^{-}\ ––––––▸ H_2 (g)+ 20H ^{-}(aq)

Anode ⇒

2Cl^{-}\ ––––––▸ Cl _2(g) 2e^{-}

Duet to formation of OH

^{–}

at cathode pH of solution increases.

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