Assign suitable terms to the following :
(i) Materials which can withstand very high temperatures without melting and softening.
(ii) Sulphide ores are generally heated in a stream of air.
(iii) The substances used for the removal of gangue in the ores in the form of slags.
(iv) Two metals which are manufactured by the electrolysis of their fused salts.
(v) Two metals used for reduction in metallurgical processes.

Explanation

Let's break down the question step by step and assign suitable terms to each statement:

### Step 1: Identify materials that withstand high temperatures
**Term:** Refractory materials
**Explanation:** Refractory materials are capable of withstanding very high temperatures without melting or softening. They are commonly used in the inner linings of furnaces due to their ability to maintain structural integrity at elevated temperatures.

### Step 2: Understand the heating of sulphide ores
**Term:** Roasting
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