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JEE Main 20179 AprilOnline
Exam
JEE Main
Year
2017
Date
9 April
Mode
Online
Subject
Chemistry
Chapter
Electrochemistry

JEE Main 2017 · 9 April · Online · Chemistry · Electrochemistry

Which of the following ions does not liberate hydrogen gas on...

Which of the following ions does not liberate hydrogen gas on reaction with dilute acids?

Options

  1. AV2+{V}^{2 +}
  2. BTi2+{Ti}^{2 +}
  3. CMn2+{Mn}^{2 +}
  4. DCr2+{Cr}^{2 +}

Correct answer

C. Mn2+{Mn}^{2 +}

Step-by-step solution

{Mn}^{2 +}doesnotdisplacedoes not displace{H}_{2}fromdiluteacidbecausetheyarelessreactive(SRPvalue)from dilute acid because they are less reactive \left(SRPvalue\right).

Given below are SRP values,
H2O∣H2=−0.8277,Mn2+∣Mn=−1.185V{H}_{2}O | {H}_{2} = - 0 . 8277, {Mn}^{2 +} | Mn = - 1 . 185V

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