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Name the ore of mercury and state the form in which it is found in nature. Write the chemical equations along with the condition required for the reactions involved in the extraction of mercury from its ore.
The metals which are found in both free state as well as combined state are :
Assertion (A) : The extraction of metals from their sulphide ores cannot take place without roasting of the ore. Reason (R) : Roasting converts sulphide ores directly into metals.
State giving reason the reduction process to obtain the following metals from their compounds :
State giving reason for the change in appearance observed when each of the following metal is exposed to atmospheric air for some time :
Define the following terms. (i) Mineral (ii) Ore (iii) Gangue
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