Fill in the blanks choosing appropriate word/ words from those given in the brackets : (gravity separation, magnetic separation, absence, presence, `CuFeS_2`, `Cu_2S`, froth flotation, aluminium, iron, smelting, pure, impure, mines, copper, silver, sulfide, zinc, chromium nickel, tin, blister copper, Cus, Fes, thermal, electrical, argentite or silver glance `(Ag_2S)`, cuprous oxide, cuprous sulfide.)
Metal purified by cupellation process is ......

Explanation

To solve the question, we need to fill in the blank with the appropriate word from the given options. The question is: "Metal purified by cupellation process is ......"

### Step-by-step Solution:

1. **Understanding the Cupellation Process**:
- The cupellation process is a refining technique used to separate noble metals from impurities. It is primarily used for the purification of silver and gold.

2. **Identifying the Metal**:
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