General Principles and Processes of Isolation of Elements Test

Directions For Questions

Amongst the various ores of a metal (M) (sulphide, carbonates, oxides, hydroxides) two ores [X] and [Y] show the following reactivity.
(i) [X] on calcination gives a black solid (S) carbon dioxide and water.
(ii) [X] dissolved in dilute HCl, on reaction with KI gives a white precipitate (P) and iodine.
(iii) [Y] on roasting gives metal (M) and a gas (G) which turns acidified $$K_{2}Cr_{2}O_{7}$$ solution green.
(iv) [Y] on reaction with dil. HCl gives a white precipitate (Q) and another gas $$\left ( G_{2} \right )$$ which turns lead acetate solution black and also reacts with gas $$\left ( G_{1} \right )$$ to precipitate colloidal in presence of moisture.

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General Princip...

Question 1

An acidic flux is needed

A basic flux is needed

Both acidic and basic flux are needed

Neither of them is needed

Question 2

$$NaF$$

$$Na_{3}AlF_{6}$$

$$AlF_{3}$$

None of these

Question 3

$$Hg$$

$$Zn$$

$$Cr$$

$$Fe$$

Question 4

$$Cu_{2}I_{2}$$

$$CuI_{2}$$

$$K_{2}\left [ CuI_{4} \right ]$$

None

Question 5

Carbon monoxide

Sulphur dioxide

Carbon dioxide

Nitric oxide

Question 6

Aluminium

Thorium

Heated platinum gauze

Carbon

Question 7

when their oxides can't be reduced by carbon

when their carbonates do not yield oxides by thermal decomposition

when their sulphides can't be converted into oxides by roasting

when their melting points are very high

Question 8

Copper

Iron

Aluminium

Magnesium

Question 9

the formation of $$ Ni(CO)_4 $$

the decomposition of $$ Ni(CO)_4 $$

the formation and thermal decomposition of $$ Ni(CO)_4 $$

the formation and catalytic decomposition of $$ Ni(CO)_4 $$

Question 10

Reduction

Carbon - reduction

Smelting

Roasting

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Question Analysis

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