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Among K, Mg, Au and Cu, the one which is extracted by heating its ore in air is(a) K(b) Mg(c) Au(d) Cu |
Answer» Answer is : (d) Cu Metal with low reactivity can be extracted by heating ore in air. This process of extraction is known as roasting. Among the given metals, Cu has least reactivity, so it can be directly extracted by heating its ore in air. 2CU2S + 3O2 → 2Cu2O + 2SO2↑ |
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