Extraction of Iron

Q. Oxidation states of the metal in the minerals hematite and magnetite, respectively, are:

1. II, III in haematite and III in magnetite

2. II, III in haematite and II in magnetite

3. II in haematite and II, III in magnetite

4. III in haematite and II, III in magnetite

Q.

In metallurgy of iron, when limestone is added to the blast furnace, the calcium ends up in:

1. gangue

2. metallic calcium

3. calcium carbonate

4. slag

Q. The purest form of commercial iron is:

1. Cast iron
2. Wrought iron
3. Pig iron
4. Scrap iron and pig iron

Q.

Match the column:
$\begin{array}{cccc}& & & \\ & Column-I& & Column-II\\ \left(a\right)& Flux& \left(p\right)& Si{O}_2\\ \left(b\right)& Slag& \left(q\right)& CaO\\ \left(c\right)& Acidicflux& \left(r\right)& CaSi{O}_3\\ \left(d\right)& Basicflux& \left(s\right)& MgO\\ & & \left(t\right)& FeSi{O}_3\end{array}$

1. (a) p, q, s; (b) r, t (c) p; (d) q, s

2. (a) p, q, s; (b) r, t (c) q, s; (d) p

3. (a) p; (b) r, t (c) p, q, s; (d) q, s

4. (a) r, t; (b) p, q, s (c) p; (d) q, s

Q.

The most impure and pure forms of iron respectively are:

1. Pig iron, Cast iron

2. Cast iron, Wrought iron

3. Wrought iron, Pig iron

4. Wrought iron, Cast iron

Q.

Which of the following processes is not involved in the extraction of Fe?

1. Gravity separation

2. Leaching

3. Roasting

4. Carbon reduction

Q. Which series of reaction correctly chemical reactions related to iron and its compound
(IIT-JEE, 2014)

1. $Fe\stackrel{C{l}_2,heat}{\to }FeC{l}_3\stackrel{heat,air}{\to }FeC{l}_2\stackrel{Zn}{\to }Fe$
2. $Fe\stackrel{O_2,heat}{\to }F{e}_3{O}_4\stackrel{CO,{600}^{\circ }C}{\to }FeC{l}_2\stackrel{CO,{700}^{\circ }C}{\to }Fe$
   
   
3. $Fe\stackrel{dil,H_{2}S{O}_4}{\to }FeS{O}_4\stackrel{H_{2}S{O}_4,O_2}{\to }Fe(S{O}_2{)}_3\stackrel{heat}{\to }Fe$
4. $Fe\stackrel{O_2,heat}{\to }FeO\stackrel{dil,H_{2}S{O}_4}{\to }FeS{O}_4\stackrel{heat}{\to }Fe$

Q.

What is the change in hybridization of oxygen atom associated with carbon in the zone of reduction?

1. It changes from sp to $s{p}^2$

2. It changes from $s{p}^2$ to sp

3. It changes from $s{p}^2$ to $s{p}^3$

4. No change

Q.

Which of the following statements are not true with respect to the production of iron?

1. The oxide ore is primarily reduced to iron by solid coke.
2. The oxide ore reduced largely by carbon monoxide.
3. Major silica impurities are removed as calcium silicate slag.
4. The silicate slag is used in manufacture of cement.

Q.

Which of the following processes is not involved in the extraction of Fe?

1. Gravity separation

2. Leaching

3. Roasting

4. Carbon reduction

Q. In the metallurgy of iron, limestone is added along with haematite ore and coke. What is main use of limestone?

1. Limestone decomposes to $CaO$ and $C{O}_2$ which reacts with coke to produce CO which is used to reduce haematite directly to iron
2. Limestone on decomposition produce $CaO$ which is used to react with $F{e}_2{O}_3$ to form slag of $CaFe{O}_4$
3. Limestone on decomposition produce $CaO$ which is used to react with $F{e}_2{O}_3$ to form slag of $CaFe{O}_3$
4. Limestone on decomposition produce $CaO$ which is used to react with $Si{O}_2$ to form slag of $CaSi{O}_3$

Q.

Which of the following is not obtained in the extraction of Iron?

1. Calcium silicate

2. Carbon monoxide

3. Ultrapure iron

4. Cast iron