Consider the following equation for an electrochemical cell reaction. Which of the following changes in condition will increase the cell voltage ?
`H_(2)(g)+PbCl_(2)(s)toPb(s)+2HCl(aq)`
(I) addition of concentrated `HClO_(4)` in the cell solution
`{:(,(II),"Increase the pressure of "H_(2)(g),(III),"increase the amount of " Pb(s)):}`

Options

A. III
B. I and II
C. II and III
D. II

Answer

D

Explanation

`E = E^(@) - (0.0591)/(2) "log" ([HCl^(2)])/([P_(H_(2))])`
as `Q darr {(P_(H_(2)) uarr , [H^(+)])} E uarr`