The correct match among the following is:

Column I	Column II
(a) Boron	(i) Van Arkel method
(b) Tin	(ii) Mond's process
(c) Zirconium	(iii) Liquation
(d) Nickel	(iv) Zone refining

 

	(a)	(b)	(c)	(d)
1.	(iv)	(iii)	(i)	(ii)
2.	(iv)	(iii)	(ii)	(i)
3.	(ii)	(i)	(iv)	(iii)
4.	(iii)	(iv)	(i)	(ii)

At a temperature above 1073 K, coke can be used to reduce FeO to Fe. It can be best explained by:

1. Ellingham diagram.

2. Orgel diagram.

3. Tunabo-Sugano diagram.

4. Born-Haber cycle.

The iron ore that is used to line the reverberatory furnace to prepare the purest form of iron is-

1. Haematite 

2. FeO

3. \(Fe_{3}O_{4}\)

4. None of the above.

What method is used to extract zinc from zinc blende?

1. Electrolytic reduction

2. Roasting followed by reduction with carbon

3. Roasting followed by reduction with another metal

4. Roasting followed by self-reduction

A major impurity in pig iron is:

1. Carbon

2. Silicon

3. Phosphorus

4. Manganese

Among the following an iron mineral is:

1. Malachite

2. Cassiterite

3. Pyrolusite

4. Magnetite

In the process of extraction of silver,

silver ore + ${\mathrm{CN}}^{-}+$ ${\mathrm{H}}_2\mathrm{O}\stackrel{{\mathrm{O}}_2}{\to }$ $$ $$ $$ $$ $$ $\left[\mathrm{X}\right]$ $+$ ${\mathrm{OH}}_{}^{-}$

[X] + Zn $\to$ $$[Y] + Ag

[X], and [Y] in the above mentioned reaction are:

1. X= [Ag(CN)${}_2$]^$-$; Y = [Zn(CN)${}_4$]^-2

2. X= [Ag(CN)${}_2$]^-3; Y=[Zn(CN)${}_4$]^-2

3. X= [Ag(CN)${}_2$]^$-$; Y=[Zn(CN)${}_6$]^$-$

4. X=[Ag(CN)${}_4$]^$-$ ; Y= [Zn(CN)${}_4$]^$-$2 

What happens in the extraction of chlorine by electrolysis of brine?

1. Oxidation of $C{l}^{-}$ ion to chlorine gas occurs.

2. Reduction of $C{l}^{-}$ ion to chlorine gas occurs.

3. For overall reaction $∆\mathrm{G}°\hspace{0.17em}$has negative value.

4. A displacement reaction takes place.

Which are the most abundant elements present inside the earth's crust?

1. Al, and Fe 

2. Al, and Cu

3. Fe, and Cu

4. Cu, and Ag