Q22 of 65 Page 18

An alloy is

An alloy is a homogeneous mixture. Alloy is a homogeneous mixture of two or more metals. For example, brass is an alloy of copper and zinc. Stainless steel is an alloy made with combination of iron with chromium with nickel.

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20

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

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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

 23

An electrolytic cell consists of

(i) positively charged cathode


(ii) negatively charged anode


(iii) positively charged anode


(iv) negatively charged cathode

 24

During electrolytic refining of zinc, it gets