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JEE Main 3 September 2020, Shift 2, Chemistry Q48

Question 48 of 75 in this shift, Chemistry question 23 of 25.

An acidic solution of dichromate is electrolyzed for 8 minutes using 2A current. As per the following equation

\mathrm{Cr_2O_7^{2-} + 14\ H^+ + 6\ e^- \rightarrow 2\ Cr^{3+} + 7\ H_2O}

The amount of

\mathrm{Cr^{3+}}

obtained was 0.104 g. The efficiency of the process(in%)is (Take : F=96000 C, At. mass of chromium=52) __________.

Official answer

60.00

NTA final key (Sep 2020).

Chapter: Electrochemistry
Topic: Faraday's Laws of Electrolysis
Idea tested: Current Efficiency

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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.