State giving reason for the change in appearance observed when each of the following metal is exposed to atmospheric air for some time :

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CASE_STUDIESExtraction of Metals Based on ReactivityCorrosion of Metals Due to Environmental FactorsCBSE PYQ3 sub-questions

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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.

Assertion-ReasonExtraction of Metals Based on ReactivityRoasting of Sulphide Ores

State giving reason the reduction process to obtain the following metals from their compounds :

CASE_STUDIES