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Chemistry of Ores and Metals

7. 

Consider the 4 statements :
Coke is one of the materials of the charge added to blast furnace for the production of steel/iron. Its function is to
1) act as a reducing agent.
2) remove silica associated with the iron ore
3) function as fuel to supply heat.
4) act as an oxidising agent.
Which of the statements are correct?

A. 1 and 2 are correct B. 2 and 4 are correct C. 1 and 3 are correct D. 3 and 4 are correct

Answer : A. 1 and 2 are correct

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8. 

An amalgamation is a mixture of

A. mercury + water B. mercury + oxygen C. mercury + chlorine D. mercury + metal

Answer : D. mercury + metal

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9. 

Which metal is involved in galvanisation process?

A. copper B. zinc C. tin D. lead

Answer : B. zinc

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10. 

Match List I correctly with List II and select your answer using the codes given below:

List I List II
a) Uranium 1) Liquid metal
b) Graphite 2) Radio activity
c) Mercury 3) Alloy
d) Steel 4) Pencil

A. a-1 ,b-2 ,c-3 ,d-4 B. a-2 ,b-4 ,c-1 ,d-3 C. a-4 ,b-3 ,c-2 ,d-1 D. a-3 ,b-2 ,c-4 ,d-1

Answer : B. a-2 ,b-4 ,c-1 ,d-3

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11. 

Which one of the following properties is NOT a characteristic of a metal?

A. It forms acidic oxides B. It can be beaten into sheets C. It is good conductor of heat D. It forms positive ions by loss of electrons

Answer : A. It forms acidic oxides

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12. 

Which of the following is true about hydrogen?
I. Its is a colourless, odourless and tasteless gas.
II. It is lightest of all gases and thus diffuses very rapidly.
III. It is virtually insoluble in water.
IV. Hydrogen is neither acidic nor basic.

A. II and IV B. I,III and IV C. I and IV D. I,II,III and IV

Answer : D. I,II,III and IV

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