Metallurgy - Inorganic Chemistry PYQ | Chemistry Exams

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?

The two major constituents of Portland cement are

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

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

i. Al

ii. Fe

iii. Cu

iv. Zn

The correct option is

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?

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

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

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?

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

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