Question

Assertion (A) : Metals in the middle of activity series are found in nature as sulphides or carbonates. Reason (R) : The sulphide ores are calcinated whereas carbonate ores are roasted to extract metals from them.

Define the following terms. (i) Mineral (ii) Ore (iii) Gangue

Assertion (A): Metals low in the reactivity series are very unreactive. The oxides of these metals can be reduced to metals by heating alone. Reason (R): Cinnabar when heated in air first gets converted into mercuric oxide which is then reduced to mercury on further heating.

A metallurgist heats zinc sulphide in the presence of excess air and notices a white solid forming along with a gas that smells like a burning matchstick.