Metallurgy Of Individual Elements

A pair of metals that can be purified by van Arkel method is:

1. Zr and Ti

2. Ag and Au

3. Ni and Fe

4. Ga and In

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with:

1. Copper(l) sulphide (Cu₂S)

2. Sulphur dioxide (SO₂)

3. Iron Sulphide (FeS)

4. Carbon monoxide (CO)

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with?

1. Iron(II) sulphide

2. Carbon monoxide

3. Copper(I) sulphide

4. Sulphur dioxide

The maximum temperature that can be achieved in blast furnace is :

1. Upto 1900 K

2. Upto 5000 K

3. Upto 1200 K

4. Upto 2200 K

The reaction that does not take place in a blast furnace between 900 K to 1500 K temperature range during the extraction of iron is:

1. CaO + SiO₂ → CaSiO₃
2. Fe₂O₃ + CO → 2FeO + CO₂
3. FeO + CO → Fe +CO₂
4. C + CO₂ → 2CO