General Principles and Processes of Isolation of Elements Test

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	Column I		Column II
(A)	Metals used as semiconductors	(i)	Aluminium
(B)	Electrolytic reduction	(ii)	Zone refining
(C)	Cyanide process	(iii)	Dressing of $$ZnS$$
(D)	Froth floatation process	(iv)	Extraction of $$Ag$$

General Princip...

Question 1

Zinc can be extracted from its ore by roasting followed by extraction with coke.

In reverberatory furnace, both oxidation and reduction processes can be carried out.

Silver is purified by distillation or liquation process.

Highly pure metals are obtained by zone refining.

Question 2

$$\triangle G^0$$ value for the overall reduction with carbon monoxide is zero.

$$\triangle G^0$$ value for the overall reaction with a mixture of 1 mol carbon and 1 mol oxygen is positive.

$$\triangle G^0$$ value for the overall reduction with a mixture of 2 mol carbon and 1 mol oxygen will be positive.

$$\triangle G^0$$ value for the reduction reaction with carbon monoxide is negative.

Question 3

Y will reduce oxide of Z.

Y will reduce oxide of X.

Z will reduce oxide of X.

Z will reduce oxide of Y.

Question 4

A metal can reduce the oxide of other metal which lies above it in the Ellingham diagram.

$$CO$$ is more effective than $$C$$ as reducing agent below $$170^0C$$.

$$\Delta G^0$$ of metal oxide is higher than of $$CO_2$$ hence oxidation of metal sulphides to oxides is not favourable.

Need for conversion of metal sulphide to metal oxide before reduction can be explained thermodynamically.

Question 5

(A) $$\rightarrow$$(i), (B)$$\rightarrow$$(iii), (C)$$\rightarrow$$(ii), (D) $$\rightarrow$$ (iv)

(A) $$\rightarrow$$(iii), (B)$$\rightarrow$$(iv), (C)$$\rightarrow$$(ii), (D) $$\rightarrow$$ (i)

(A) $$\rightarrow$$(iv), (B)$$\rightarrow$$(ii), (C)$$\rightarrow$$(iii), (D) $$\rightarrow$$ (i)

(A) $$\rightarrow$$(ii), (B)$$\rightarrow$$(i), (C)$$\rightarrow$$(iv), (D) $$\rightarrow$$ (iii)

Question 6

be reduced by carbon monoxide only

be reduced by both carbon monoxide and carbon

be reduced by carbon only

not be reduced by both carbon monoxide and carbon

Question 7

Below temperature at point A

Approximately at the temperature corresponding to point A

Above temperature at point A but below temperature at point D

Above temperature at point A

Question 8

carbon is not a powerful reducing agent

magnesium reacts with carbon to form carbides

magnesium is less electropositive than carbon

carbon does not react with magnesium

Question 9

$${B}_{2}{H}_{6}$$

$${C}_{2}{H}_{6}$$

$${Na}_{3}Al{F}_{6}$$

$$Si{H}_{4}$$

Question 10

Aluminium reduction

Self Reduction

Electrolytic reduction

Hydrometallurgical reduction

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