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Chemistry - Metals and Non-metals

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16. Which are the components of stainless steel? (NTSE Gujarat, Stage-I, 2015-16)

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17. The nobel gas which occurs most abundantly in the atmosphere is (NTSE Haryana, Stage-I, 2015-16)

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18. Objective of roasting of are is (NTSE Chhattisgarh, Stage-I, 2016-17)

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19. Which of the following has electrovalent bond? (NTSE Chhattisgarh, Stage-I, 2016-17)

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20. Chemical tests of four metals A, B, C, D shown the following results :
* Only Band C react with 0.5 M HCI to give H2 gas
* When B is added to a solution containing the ions of the other metals
* A reacts with 6 M HN03, but D does not
Arrange the metals in the increasing order as reducing agents.

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Metals and Non-metals