Consider the following metallurgical operations for two ores of copper (X) and (Y).
`X overset ("Calcination")to "Black ppt." (C ) + CO_2 + H _ 2 O `
` Y overset ("Roasting") to "Metal M" + "Gas(G)" `
Identify (X), (Y), (Z), (M) and (G).

Explanation

To solve the problem, we need to identify the ores and products involved in the metallurgical operations of calcination and roasting for two copper ores, X and Y.

### Step-by-Step Solution:

1. **Identify Ore X**:
- The operation performed on Ore X is calcination. Calcination typically involves the thermal decomposition of carbonates.
- The black precipitate (C) formed during this process is cupric oxide (CuO).
- Therefore, Ore X must be a copper carbonate. The common copper carbonate ore is **Malachite**, which has the formula **CuCO₃·Cu(OH)₂**.
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