Roasting is carried out on carbonate ores for obtaining its oxide form.

True

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False

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Solution

The correct option is B
False

Roasting and calcination are the processes that are carried out for converting concentrated ores to its oxide. Roasting is carried out on sulphide ores for obtaining its oxide form. Usually, calcination is employed for decomposing carbonate ores into their corresponding oxides (the carbon dioxide gas is allowed to escape or is sometimes recycled).

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Explain with reasons:

(a) In the electrolytic reduction of alumina, the graphite anode is gradually consumed.

Why the anode has to be replaced in this process?

(b) Roasting is carried out on sulphide ores and not on carbonate ores.

(d) Electrolytic reduction is done to obtain aluminium?

(e) Why 'the food containing iron salts' should not be cooked in aluminium utensils?

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