Question

Among the statements (a)-(d), the correct ones are:

(a) Limestone is decomposed to $\mathrm{CaO}$ during the extraction of iron from its oxides.

(b) In the extraction of silver, silver is extracted as an anionic complex.

(c) Nickel is purified by Mond’s process.

(d) $\mathrm{Zr}$ and $\mathrm{Ti}$ are purified by Van Arkel method.

• A. $\left(\mathrm{c}\right)$ and $\left(\mathrm{d}\right)$ only
• B. $\left(\mathrm{b}\right),\left(\mathrm{c}\right)$ and $\left(\mathrm{d}\right)$
• C. $\left(\mathrm{a}\right),\left(\mathrm{b}\right),\left(\mathrm{c}\right)$ and $\left(\mathrm{d}\right)$
• D. $\left(\mathrm{a}\right),\left(\mathrm{c}\right)$ and $\left(\mathrm{d}\right)$

Answer 1

The correct option is C

$\left(\mathrm{a}\right),\left(\mathrm{b}\right),\left(\mathrm{c}\right)$ and $\left(\mathrm{d}\right)$

Explanation of correct option:

(C) $\left(a\right)\mathbf{,}\mathbf{}\left(b\right)\mathbf{,}\mathbf{}\left(c\right)$ and $\left(d\right)$

In extraction of iron from its oxides limestone $\left({\mathrm{CaCO}}_3\right)$is decomposed into $\mathrm{CaO}$.

1. Hence statement $\left(\mathrm{a}\right)$ is correct.
2. ${\mathrm{CaCO}}_3\left(\mathrm{s}\right)+\mathrm{FeO}\left(\mathrm{s}\right)\to \mathrm{CaO}\left(\mathrm{s}\right)+{\mathrm{FeCO}}_3\left(\mathrm{s}\right)$
3. Silver is extracted as an anionic complex.
4. Hence statement $\left(\mathrm{b}\right)$ is correct.
5. Nickel is purified by Mond’s process.
6. ${\mathrm{NiCO}}_4\left(\mathrm{s}\right)\underset{}{\overset{}{\to }}\mathrm{Ni}\left(\mathrm{s}\right)+\mathrm{CO}\left(\mathrm{g}\right)$
7. Hence statement $\left(\mathrm{c}\right)$ is correct.
8. $\mathrm{Zr}$ and $\mathrm{Ti}$ are purified by Van Arkel method.
9. $\mathrm{Zr}$(impure) $+2{\mathrm{I}}_2\underset{}{\overset{}{\to }}{\mathrm{ZrI}}_4$(vapour)
10. ${\mathrm{ZrI}}_4$(vapour) $\underset{}{\overset{}{\to }}Zr$(pure) $+2{\mathrm{I}}_2$
11. Hence statement $\left(\mathrm{d}\right)$ is correct.

Explanation for incorrect options:

(A) $\left(c\right)$ and $\left(d\right)$ only

Statements $\left(\mathrm{c}\right)$ and $\left(\mathrm{d}\right)$are correct but along with them statement $\left(\mathrm{a}\right)$ and $\left(\mathrm{b}\right)$ are also correct but they are not mentioned.

(B) $\mathbf{\left(}\mathbf{b}\mathbf{\right)}\mathbf{,}\mathbf{}\mathbf{\left(}\mathbf{c}\mathbf{\right)}$ and $\left(d\right)$only

Statements $\left(\mathrm{b}\right)$, $\left(\mathrm{c}\right)$ and $\left(\mathrm{d}\right)$are correct but along with them statement $\left(\mathrm{a}\right)$ is also correct but it is not mentioned.

(D) $\mathbf{\left(}\mathbf{a}\mathbf{\right)}\mathbf{,}\mathbf{}\mathbf{\left(}\mathbf{c}\mathbf{\right)}$ and $\left(d\right)$ only

Statement $\left(\mathrm{a}\right)$, $\left(\mathrm{c}\right)$ and $\left(\mathrm{d}\right)$ are correct but along with them statement $\left(\mathrm{b}\right)$ is also correct but it is not mentioned.

Hence option C is correct, all the statements $\left(\mathrm{a}\right),\left(\mathrm{b}\right),\left(\mathrm{c}\right)$ and $\left(\mathrm{d}\right)$ are correct.