The main reactions occurring in blast furnace during extraction of iron from haematite are______________.

1

(a)

Fe₂O₃+3CO\(\longrightarrow\)2Fe+3CO₂

(b)

FeO+SiO₂\(\longrightarrow\)FeSiO₃

(c)

Fe₂O₃+3C\(\longrightarrow\)2Fe+3CO

(d)

CaO+SiO₂\(\longrightarrow\)CaSiO₃

Which of the following statements are correct?

1

(a)

A depressant prevents certain type of particle to come to the froth

(b)

Copper matte contains Cu₂S and ZnS

(c)

The solidified copper obtained from reverberatory furnace has blistered appearance due to evolution of SO₂during the extraction

(d)

Zinc can be extracted by self-reduction

In the extraction of chlorine from brine _____________________.

1

(a)

\(\Delta G^{\ominus}\) for the overall reaction is negative

(b)

\(\Delta G^{\ominus}\) for the overall reaction is positive

(c)

\(E^{\ominus}\) for the overall reaction has negative value

(d)

\(E^{\ominus}\) for the overall reaction has positive value

When copper ore is mixed with silica in a reverberatory furnace, copper matte is produced. The copper matte contains

1

(a)

sulphides of copper (II) and iron (II)

(b)

sulphides of copper (II) and iron (III)

(c)

sulphides of copper (I) and iron (II)

(d)

sulphides of copper (I) and iron (III)

Electrolytic refining is used to purify which of the following metals?

1

(a)

Cu and Zn

(b)

Ge and Si

(c)

Zr and Ti

(d)

Zn and Hg