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0. 5 mL each of conc. HCI, HN03 and a mixture of conc HCI (15 mL) and conc HN03 (5 mL) was taken in a separate test tube and labelled as A, B and C respectively. A small piece of metal was put in each test tube, No change occurred in test tube A and B but the metal got dissolved in test tube C. The metal could be (NTSE Jharkhand, Stage-I, 2016-17)

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