Question

Consider the cell:
$Zn|Z{n}^{2+}\left(aq\right)\left(1.0M\right)||C{u}^{2+}\left(aq\right)\left(1.0M\right)||Cu$
The standard reduction potential are 0.350 V for;
$C{u}^{2+}\left(aq\right)+2e^{-}\to Cu$ and -0.763 V for;
$Z{n}^{2+}\left(aq\right)+2e^{-}\to Zn$.

Assertion: The reaction is spontaneous.

Reason: The cell potential is positive.

• A. Both Assertion and Reason are true and Reason is the correct explanation of Assertion
  
• B. Assertion is true but Reason is false
• C. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
• D. Assertion is false but Reason is true
• E. Both Assertion and Reason are false

Answer 1

Answer: (A)

$Zn|Z{n}^{2+}\left(aq\right)\left(1.0M\right)||C{u}^{2+}\left(aq\right)\left(1.0M\right)||Cu$
As we know,
$E=E_{cathode}-E_{anode}=0.35-(-0.76)=1.1V$
as it is positive so its a spontaneous reaction.