Q54 of 52 Page 85

Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

Copper is indeed extracted by hydrometallurgy and hydrometallurgy involves precipitating the ore by a more electropositive metal so the two statements are individually correct but reason does not explain the assertion made. The reason statement is simply a consequence of the assertion statement.

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51

Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

 52

Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

 53

Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

 55

Explain the following :

(a) CO2 is a better reducing agent below 710K whereas CO is a better reducing agent above 710K.


(b) Generally sulphide ores are converted into oxides before reduction.


(c) Silica is added to the sulphide ore of copper in the reverberatory furnace.


(d) Carbon and hydrogen are not used as reducing agents at high temperatures.


(e) Vapour phase refining method is used for the purification of Ti.