Question

Assertion :Increase in the concentration of copper half cell in daniel cell increases the emf of the cell. Reason: According to Nernst equation. $E_{cell}=E{{}_{cell}}^0+\frac{0.059}{2}log\frac{\left[C{u}^{2+}\right]}{\left[Z{n}^{2+}\right]}$.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

for daniel cell, equation of $E_{cell}$
$E_{cell}=E_{cell}^{\circ }-\frac{0.059}{n}log\left(\frac{Z{n}^{2+}}{C{u}^{2+}}\right)$
$\text{no. of election}=2$
$\therefore E_{cell}=E_{cell}^{\circ }+\frac{0.059}{2}log\frac{\left[C{u}^{2+}\right]}{\left[Z{n}^{2+}\right]}$
$\therefore$ as concentration of $C{u}^{2+}$
increases $log\frac{\left[C{u}^{2+}\right]}{\left[Z{n}^{2+}\right]}$
$\therefore E_{cell}$ increases