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.

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

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