On the basis of position in the electrochemic | vedclass

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Question

(A) The electrochemical series lists elements in order of their standard reduction potentials. Metals with a negative reduction potential (above $H_2$

Vedclass · Accepted Answer

$Hg$

Vedclass · Answer

(A) The electrochemical series lists elements in order of their standard reduction potentials. Metals with a negative reduction potential (above $H_2$ in the series) can displace hydrogen from water or acids. Metals with a positive reduction potential (below $H_2$ in the series) cannot displace hydrogen. $Hg$ (mercury) has a positive standard reduction potential $(E^0 = +0.85 \ V)$,which is higher than that of hydrogen $(E^0 = 0.00 \ V)$. Therefore,$Hg$ cannot reduce $H^+$ ions to $H_2$ gas. Thus,the correct option is $(A)$.

List-$I$ (Applications)	List-$II$ (Batteries/Cell)
$A$. Transistors	$I$. Anode $- Zn/Hg$; Cathode $- HgO + C$
$B$. Hearing aids	$II$. Hydrogen fuel cell
$C$. Inverters	$III$. Anode $- Zn$; Cathode $- Carbon$
$D$. Apollo space ship	$IV$. Anode $- Pb$; Cathode $- PbO_2$

On the basis of position in the electrochemical series,the metal which does not displace hydrogen from water and acid is

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