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JEE Main 202529 JanuaryEvening Shift
Exam
JEE Main
Year
2025
Date
29 January
Shift
Evening Shift
Subject
Chemistry
Chapter
Electrochemistry

JEE Main 2025 · 29 January · Evening Shift · Chemistry · Electrochemistry

O_2 gas will be evolved as a product of electrolysis of : (A) an...

O2\mathrm{O}_2 gas will be evolved as a product of electrolysis of : (A) an aqueous solution of AgNO3\mathrm{AgNO}_3 using silver electrodes. (B) an aqueous solution of AgNO3\mathrm{AgNO}_3 using platinum electrodes. (C) a dilute solution of H2SO4\mathrm{H}_2 \mathrm{SO}_4 using platinum electrodes. (D) a high concentration solution of H2SO4\mathrm{H}_2 \mathrm{SO}_4 using platinum electrodes. Choose the correct answer from the options given below :

Options

  1. A(A) and (C) only
  2. B(B) and (C) only
  3. C(A) and (D) only
  4. D(B) and (D) only

Correct answer

B. (B) and (C) only

Step-by-step solution

When an aqueous solution of AgNO3\mathrm{AgNO}_3 is electrolysed using Pt electrodes Cathode: Ag+(aq)+e−→Ag(s)\mathrm{Ag}^{+}(\mathrm{aq})+\mathrm{e}^{-} \rightarrow \mathrm{Ag}(\mathrm{s}) Anode : 2H2O(l)⇌4H+(aq)+O2( g)+4e−2 \mathrm{H}_2 \mathrm{O}(\mathrm{l}) \rightleftharpoons 4 \mathrm{H}^{+}(\mathrm{aq})+\mathrm{O}_2(\mathrm{~g})+4 \mathrm{e}^{-} ⇒\Rightarrow When dilute H2SO4\mathrm{H}_2 \mathrm{SO}_4 is electrolysed using Pt electrodes ⇒\Rightarrow When dilute H2SO4\mathrm{H}_2 \mathrm{SO}_4 is electrolysed using Pt electrodes Anode : 2H2O(l)→O2( g)+4H+(aq)+4e−2 \mathrm{H}_2 \mathrm{O}(\mathrm{l}) \rightarrow \mathrm{O}_2(\mathrm{~g})+4 \mathrm{H}^{+}(\mathrm{aq})+4 \mathrm{e}^{-} Cathode: 2H+(aq)+2e−→H2( g)2 \mathrm{H}^{+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightarrow \mathrm{H}_2(\mathrm{~g})
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