The metal purified by Mond process is $X$. The number of unpaired electrons in $X$ is

Which of the following methods is useful for producing semiconductor grade metals of high purity?

Which of the following is not associated with water molecules ?

$ \text { Match the following } $

$ \begin{array}{llll} \hline & \text { List-I (Process) } & & \text { List-II (Metal) } \\ \hline \text { (A) } & \text { Hall-Heroult process } & \text { (I) } & \mathrm{Ti} \\ \hline \text { (B) } & \text { Mond process } & \text { (II) } & \mathrm{In} \\ \hline \text { (C) } & \text { van-Arkel process } & \text { (III) } & \mathrm{Al} \\ \hline \text { (D) } & \text { Zone refining process } & \text { (IV) } & \mathrm{Ni} \\ \hline \end{array} $

The correct answer is

Which of the following reactions is an example of roasting?

Consider the following.

Statement-I In the extraction of Al by Hall-Heroult process, pure $\mathrm{Al}_2 \mathrm{O}_3$ mixed with $\mathrm{Na}_3 \mathrm{AlF}_6$ lowers its melting point and increases conductivity.

Statement-II Zirconium metal is purified by zone refining method.

Which of the following is used as froth stabilizer in froth floatation process?

In the extraction of iron from haematite, the impurity $(x)$ of the ore is removed in the form of ' $y$ ', what are $x$ and $y$ respectively?

$ \text { Which of the following sets are correctly matched? } $

$ \begin{array}{cll} \hline & \text { Metal } & \text { Refining Process } \\ \hline \text { I. } & \mathrm{Hg} & \text { Distillation } \\ \hline \text { II. } & \mathrm{Cu} & \text { Poling } \\ \hline \text { III. } & \mathrm{B} & \text { Zone refining } \\ \hline \text { IV. } & \mathrm{Ti} & \text { Liquation } \\ \hline \end{array} $

Kaolinite, a form of clay is the ore of metal $x$ and malachite is the ore of metal $y, x$ and $y$ respectively are

The alloy that contains copper and Zn is $x$ and the one that contains copper and Ni is $y$. What are $x$ and $y$ respectively?

In which of the following metals extraction, impurities are removed as slag?

i. Al

ii. Fe

iii. Cu

iv. Zn

The correct option is

The reactions which occur in blast furnace at $500-800 \mathrm{~K}$ during extraction of iron from haematite are

i. $3 \mathrm{Fe}_2 \mathrm{O}_3+\mathrm{CO} \longrightarrow 2 \mathrm{Fe}_3 \mathrm{O}_4+\mathrm{CO}_2$

ii. $\mathrm{Fe}_2 \mathrm{O}_3+3 \mathrm{C} \longrightarrow 2 \mathrm{Fe}+3 \mathrm{CO}$

iii. $\mathrm{Fe}_3 \mathrm{O}_4+4 \mathrm{CO} \longrightarrow \mathrm{Fe}+4 \mathrm{CO}_2$

iv. $\mathrm{Fe}_2 \mathrm{O}_3+\mathrm{CO} \longrightarrow 2 \mathrm{FeO}+\mathrm{CO}_2$

The two major constituents of Portland cement are

A compound A is used in paints instead of salts of lead. Compound A is obtained when a white compound B is strongly heated. Compound B is insoluble in water but dissolves in NaOH solution forming a solution of compound C. The compound A on heating with coke gives a volatile metal D and a gas E which burns with a blue flame. Identify the possible species D and C can be respectively?