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Chemistry - Metals and Non-metals

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56. 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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57. Which of the following metals is present in the anode mud during the electrolytic refining of copper? (NTSE Jharkhand, Stage-I, 2016-17)

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58. Which of the following is true about the two statements?
Statement I : Reactivity of aluminium decreases when it is dipped in nitric acid. Statement
II: A protective layer of aluminium nitrate is formed when aluminium is dipped innitric acid (NTSE Stage-II,2014-15)

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59. An element X combines with hydrogen to form a
compound XH3. The element X is placed on the
right side of the periodic table. What is true about
the element X?
(a) Has 3 valence electrons
(b) Is a metal and is a solid
(c) Is a non-metal and is a gas
(d) Has 5 valence electrons
(e) XH3 reacts with water to form a basic
compound (NTSE Stage-II, 2014-15)

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60. The metal used to recover copper from an aqueous solution of copper sulphate is (NTSE Stage-II, 2015-16)

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Metals and Non-metals