Chemistry - Metals and Non-metals

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46. Hydrogen gas is not liberated when Pb is reacted with conc. HN03 because

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47. Which of the following electrovalent compound both cation and anion represent the same inert gas configuration?(NTSE Andhra Pradesh, Stage-I, 2015-16)

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48. Copper sulphate solution is electrolysed with platinum electrodes. Which of the following changes does not occur in the process? (NTSE Odisha, Stage-I, 2016-17)

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49. Which of the following salts fails to give brown gas on heating? (NTSE Odisha, Stage-I, 2016-17)

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50. Pick up the incorrect pair of metal-ore from the following (NTSE Odisha, Stage-I, 2016-17)

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