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A(1) and A(2) are two ores of metal M.A(...

`A_(1)` and `A_(2)` are two ores of metal `M.A_(1)` on calcination gives a black precipitate, `CO_(2)` and water. Identify `A_(1)` and `A_(2)`.
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The correct Answer is:
`A_(1)`: Malachite `A_(2):` Copper glance
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