Question

$Z{n}_{(s)}+C{l}_2(1atm)\to Z{n}^{2+}+2C{l}^{-};E^{\circ }=2.0V$ To increase the e.m.f. of the above cell

• A. $[Z{n}^{2+}]$ should be increased
• B. $[Z{n}^{2+}]$ should be decreased
• C. $[C{l}^{-}]$ should be increased
• D. partial pressure of $C{l}_2$ should be decreased.

Answer 1

Answer: (B)

$E_{cell}=E_{cell}^{\circ }-\frac{0.0591}{2}\log [Z{n}^{2+}][C{l}^{-}{]}^2$
Hence, decrease in $[Z{n}^{2+}]$ will increase $E_{cell}$