Q20 of 65 Page 18

Which one of the following four metals would be displaced from the solution of its salts by other three metals?

Ag (silver) would be displaced from the solution of its salts by other three metals, i.e., magnesium (Mg), zinc (Zn) and copper (Cu). Silver (Ag) is a noble metal and is least reactive metal among other metals given.

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18

Which of the following metals are obtained by electrolysis of their chlorides in molten state?

(i) Na


(ii) Ca


(iii) Fe


(iv) Cu

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Generally, non-metals are not lustrous. Which of the following non-metal is lustrous?

 21

2mL each of concentrated HCl, HNO3 and a mixture of concentrated HCl and concentrated HNO3 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

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An alloy is