General Principles and Processes of Isolation of Elements

1.

Native silver metal forms a water-soluble complex with a dilute aqueous solution of NaCN in the presence of:
1. Nitrogen
2. Oxygen
3. Carbon Dioxide
4. Argon

2.

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

3.

The methods chiefly used for the extraction of lead and tin from their ores respectively:
(1) Self reduction and carbon reduction
(2) Self reduction and electrolytic reduction
(3) Carbon reduction and self reduction
(4) Cyanide process and carbon reduction

4.

Mg in the Kroll process acts as
(1) Reducing agent
(2) Oxidizing agent
(3) Oxidizing agent at low temperature
(4) Reducing agent at low temperature

5.

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)

6.

The chemical composition of "slag" formed during the smelting process in the extraction of copper is:
1. Cu₂+ FeS
2. FeSiO₃
3. CuFeS
4. Cu₂S + FeO

7.

The correct statement among the following is:

1.	In the decomposition of oxide into oxygen and gaseous metal, entropy increases.
2.	Decomposition of oxide is an endothermic change.
3.	To make ∆G° negative, the temperature should be high enough so that T∆S° > ∆H°.
4.	All of the above.

8.

Incorrect statement for the Hall-Heroult process is:

1.	Cryolite Na₃AlF₆ lower the melting point of Al₂O₃, and increase its electrical conductivity.
2.	Al is obtained at the cathode, and CO₂ at the anode.
3.	Li₂CO₃ can be used in place of cryolite(Na₃AIF₆)
4.	MgF₂ can be used in place of fluorspar (CaF₂)

9.

What is the composition of the anode mud used in the electrolytic refining of silver?
1. Zn, Cu, Ag, Au
2. Zn, Ag, Au
3. Cu, Ag, Au
4. Au only

10.

A substance that can act as collector in the froth floatation method is -
1. Sodium xenate.
2. Sodium pyrophosphate.
3. Sodium nitroprusside.
4. Sodium ethyl xanthate.

11.

$X C l_{2} (e x c e s s) + Y C l_{2} \to X C l_{4} + Y ↓;$
$Y O \to_{> 400 °}^{∆} \frac{1}{2} O_{2} + Y,$
Ore of Y would be:
(a) Siderite
(b) Cinnabar
(c) Malachite
(d) Hornsilver

12.

Poling process is used for:
(1) The removal of $C u_{2} O$ from Cu
(2) The removal of $A l_{2} O_{3}$ from Al
(3) The removal of $F e_{2} O_{3}$ from Fe
(4) All of these

13.

Consider the following reactions:
$2 X S + 3 O_{2} \overset{∆}{\to} 2 X O + 2 S O_{2}$
$2 X O + X S \overset{∆}{\to} 3' X' + S O_{2}$
Then 'X' cannot be:
(a) Oxidising agent (b) Reducing agent
(c) Catalyst (d) metal

14.

Which of the following elements is present as the impurity to the maximum extent in the
pig iron?
1. Carbon
2. Silicon
3. Phosphorus
4. Manganese

15.

Aluminium is used as a reducing agent in the reduction of :-
1. Cr₂O₃
2. SnO₂
3. ZnO
4. HgO

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