Which of the following ions does not liberate | vedclass

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(D) Ion$E^o \ (M^{3+}/M^{2+}) \ (V)$$Ti^{2+}$$-0.37$$V^{2+}$$-0.26$$Cr^{2+}$$-0.41$$Mn^{2+}$$+1.57$The liberation of hydrogen gas from dilute acids by

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$Mn^{2+}$

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(D) Ion$E^o \ (M^{3+}/M^{2+}) \ (V)$$Ti^{2+}$$-0.37$$V^{2+}$$-0.26$$Cr^{2+}$$-0.41$$Mn^{2+}$$+1.57$The liberation of hydrogen gas from dilute acids by metal ions depends on the reduction potential of the $M^{3+}/M^{2+}$ couple. If the $E^o$ value is negative,the $M^{2+}$ ion can be oxidized to $M^{3+}$ while reducing $H^+$ to $H_2$ gas. Among the given ions,$Mn^{2+}$ has a highly positive $E^o$ value $(+1.57 \ V)$,which means it is very stable and does not easily lose an electron to reduce $H^+$ ions. Therefore,$Mn^{2+}$ does not liberate hydrogen gas.

Column-$I$	Column-$II$
$A$. $Pb_3O_4$	$I$. Neutral oxide
$B$. $N_2O$	$II$. Acidic oxide
$C$. $Mn_2O_7$	$III$. Basic oxide
$D$. $Bi_2O_3$	$IV$. Mixed oxide

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

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Column-$I$ Column-$II$

$A$. $Pb_3O_4$ $I$. Neutral oxide

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$C$. $Mn_2O_7$ $III$. Basic oxide

$D$. $Bi_2O_3$ $IV$. Mixed oxide

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