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1. \(2\) mL each of concentrated \(HCl\), \(HNO_3\) and a mixture of concentrated \(HCl\) and concentrated \(HNO_3\) in the ratio of \(3 : 1\) were taken in test
tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B, but the metal got dissolved in test tube C, respectively. The metal could be
2. An alloy is
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