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Saturday, 31 October

JEE Main 2025 · ChemistryMultiple choiceTwo statementsMediumConceptual

JEE Main 7 April 2025, Shift 2, Chemistry Q56

Question 56 of 75 in this shift, Chemistry question 6 of 25, Section A.

Given below are two statements : 1 M aqueous solutions of each of Cu(NO3)2\mathrm{Cu(NO_3)_2}, AgNO3\mathrm{AgNO_3}, Hg2(NO3)2\mathrm{Hg_2(NO_3)_2}, Mg(NO3)2\mathrm{Mg(NO_3)_2} are electrolysed using inert electrodes. Given : EAg+/Agθ=0.80E^\theta_{Ag^+/Ag}=0.80 V, EHg22+/Hgθ=0.79E^\theta_{Hg_2^{2+}/Hg}=0.79 V, ECu2+/Cuθ=0.24E^\theta_{Cu^{2+}/Cu}=0.24 V and EMg2+/Mgθ=−2.37E^\theta_{Mg^{2+}/Mg}=-2.37 V. Statement (I) : With increasing voltage, the sequence of deposition of metals on the cathode will be Ag, Hg and Cu. Statement (II) : Magnesium will not be deposited at cathode instead oxygen gas will be evolved at the cathode. In the light of the above statements, choose the most appropriate answer from the options given below :
  1. (1)Both Statement I and Statement II are correct
  2. (2)Both Statement I and Statement II are incorrect
  3. (3)Statement I is correct but Statement II is incorrectOfficial answer
  4. (4)Statement I is incorrect but Statement II is correct

Official answer

Option 3

NTA final key.

Chapter
Electrochemistry
Topic
Faraday's Laws of Electrolysis
Idea tested
Predicting Products

Same idea in other shifts

Asked 2× in all
  1. 4 Sep 2020, Shift 2 · Q27250 mL of a waste solution obtained from the workshop of a goldsmith contains 0.1 M AgNO3\mathrm{AgNO_3} and 0.1 M AuCl. The solution was…MediumSingle correct

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.