General Principles and Processes of Isolation of Elements NEET MCQ

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1. Which of the following is a non-metallic ore?

a) Bauxite
b) Malachite
c) Calamine
d) Cryolite

Answer:

d) Cryolite

Explanation:

Cryolite is an ore of the non-metal fluorine.

2. Which method is commonly employed for purification of metals of high reactivity?

a) Distillation
b) Electrolytic refining
c) Liquation
d) Poling

Answer:

b) Electrolytic refining

Explanation:

Highly reactive metals like Na, K, Ca are purified by the process of electrolytic refining.

3. Which of the following is not a method of ore concentration?

a) Froth flotation
b) Hydraulic washing
c) Electrolysis
d) Magnetic separation

Answer:

c) Electrolysis

Explanation:

Electrolysis is a method of extraction and not concentration of ore.

4. For which of the following ores is the froth flotation method used?

a) Iron ores
b) Galena
c) Magnesite
d) Bauxite

Answer:

b) Galena

Explanation:

Froth flotation is used for sulphide ores and galena is a lead sulphide ore.

5. Calcination involves:

a) Heating in absence of air
b) Heating in presence of a limited amount of air
c) Conversion of metal to its oxide
d) Conversion of metal to its sulphide

Answer:

a) Heating in absence of air

Explanation:

Calcination is the process of heating a substance in the absence of air to remove volatile substances.

6. Which of the following ores is best concentrated by leaching?

a) Magnetite
b) Bauxite
c) Chalcopyrite
d) Galena

Answer:

b) Bauxite

Explanation:

Bauxite, containing impurities like iron oxide, is best concentrated by leaching using NaOH.

7. In the extraction of copper, the roasted ore is mixed with:

a) Carbon
b) Silica
c) Lime
d) None of the above

Answer:

b) Silica

Explanation:

The roasted copper ore is mixed with silica (SiO2) before reduction.

8. Which of the following metals is obtained by reduction with CO?

a) Zinc
b) Tin
c) Iron
d) Lead

Answer:

c) Iron

Explanation:

Iron is obtained from its ores by reduction using carbon monoxide in the blast furnace.

9. Which is the most suitable reducing agent for the extraction of tungsten?

a) Carbon
b) Hydrogen
c) Aluminium
d) Coke

Answer:

c) Aluminium

Explanation:

Tungsten is extracted from its ores by reduction with aluminium.

10. The principle ore of mercury is:

a) Calamine
b) Cinnabar
c) Hematite
d) Cassiterite

Answer:

b) Cinnabar

Explanation:

Cinnabar (HgS) is the main ore of mercury.

11. Which of the following is used to concentrate ore in the Bayer’s process?

a) NaOH
b) H2SO4
c) H2O
d) CO2

Answer:

a) NaOH

Explanation:

In the Bayer’s process, bauxite is treated with NaOH to concentrate the ore.

12. Anode mud in electrolytic refining contains:

a) Impurities of baser metals
b) Pure metal
c) Non-metals
d) Noble metals

Answer:

d) Noble metals

Explanation:

Anode mud often contains noble metals like gold, silver, etc.

13. Which of the following elements is present as a native metal in nature?

a) Iron
b) Aluminium
c) Gold
d) Copper

Answer:

c) Gold

Explanation:

Gold is often found in its native elemental form in nature.

14. The role of silica in the metallurgy of copper is to:

a) Decrease the melting point of the charge
b) Act as a flux
c) Reduce the ore to copper
d) Remove the iron impurity as slag

Answer:

d) Remove the iron impurity as slag

Explanation:

Silica reacts with iron oxide present in the roasted ore to form iron silicate (slag).

15. Zinc can be extracted from zinc blende by:

a) Roasting followed by reduction with coke
b) Electrolytic reduction
c) Reduction with aluminium
d) Distillation

Answer:

a) Roasting followed by reduction with coke

Explanation:

Zinc blende (ZnS) is first roasted to zinc oxide and then reduced with coke.

16. The metal extracted by leaching process is:

a) Ag
b) Cu
c) Zn
d) Pb

Answer:

a) Ag

Explanation:

Silver is extracted by the leaching process from its ore.

17. The flux used in the extraction of iron is:

a) Limestone
b) Silica
c) Coke
d) Borax

Answer:

a) Limestone

Explanation:

Limestone is used as a flux in the extraction of iron to remove impurities.

18. Which ore can be concentrated by magnetic separation method?

a) Galena
b) Calcite
c) Magnetite
d) Bauxite

Answer:

c) Magnetite

Explanation:

Magnetite (Fe3O4) can be separated from a mixture using magnetic separation method.

19. The purpose of adding Na2CO3 and pine oil in the froth floatation process is respectively:

a) To act as a depressant and froth stabilizer
b) To act as a froth stabilizer and collector
c) To act as a collector and froth stabilizer
d) To act as a depressant and collector

Answer:

a) To act as a depressant and froth stabilizer

Explanation:

Na2CO3 acts as a depressant for gangue and pine oil acts as a froth stabilizer.

20. The process in which ore is heated in a regular supply of air in a furnace at a temperature below its melting point is known as:

a) Calcination
b) Roasting
c) Smelting
d) Refining

Answer:

b) Roasting

Explanation:

Roasting is the process in which ore is heated in a regular supply of air in a furnace at a temperature below its melting point to convert it into an oxide.

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