Baeyer's Process

Q. Which of the following is correct expression for the zinc amalgam electrode?

1. $E_{Z{n}^{2+}/Zn}=E_{Z{n}^{2+}/Zn}^0+\frac{2.303RT}{2F}log\frac{1}{\left[Z{n}^{2+}\right]}$
2. $E_{Z{n}^{2+}/Zn}=E_{Z{n}^{2+}/Zn}^0-\frac{2.303RT}{2F}log\frac{\left[Zn\right(Hg\left)\right]}{\left[Z{n}^{2+}\right]}$
3. $E_{Z{n}^{2+}/Zn}=E_{Z{n}^{2+}/Zn}^0+\frac{2.303RT}{2F}log\frac{\left[Zn\right(Hg\left)\right]}{\left[Z{n}^{2+}\right]}$
4. $E_{Z{n}^{2+}/Zn}=E_{Z{n}^{2+}/Zn}^0-\frac{2.303RT}{F}log\frac{1}{\left[Z{n}^{2+}\right]}$

Q.

In Bayer’s leaching process, the siliceous impurities $\left(Si{O}_2\right)$ are filtered out immediately after leaching with NaOH – True or False?

1. True

2. False

Q. Match List I with List II and select the correct answer using the codes given below the list : -

$\begin{array}{cc}\text{List - I}& \text{List - II}\\ \text{(Metals)}& (\text{Extraction Process)}\\ \text{(a)}Au& \left(1\right)\text{Self reduction}\\ \text{(b)}Al& \left(2\right)\text{Liquation}\\ \text{(c)}Pb& \left(3\right)\text{Electrolysis}\\ \text{(d)}Sn& \left(4\right)\text{Bayer process}\end{array}$

1. a - 3, b - 1, c - 2, d - 4
2. a - 1, b - 2, c - 4, d - 3
3. a - 3, b - 4, c - 1, d - 2
4. a - 3, b - 2, c - 4, d - 1