Q2 / 90 · JEE Main 2017 (09 Apr Online) · Chemistry

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

A
$V^{2 +}$
B
${Ti}^{2 +}$
Correct answer
C
${Mn}^{2 +}$
D
${Cr}^{2 +}$

Solution

${Mn}^{2 +}$ does not displace $H_{2}$ from dilute acid because they are less reactive $(SRP value)$ .

Given below are SRP values,
$H_{2} O | H_{2} = - 0.8277, {Mn}^{2 +} | Mn = - 1.185 V$

Hence, the correct answer is option: 'C'.

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