Page 218 - Chemistry ICSE Class X

204 ICSE Chemistry – 10
(b) Name the constituents of the following alloys:

(i) Brass (ii) Stainless steel (iii) Bronze
(c) State one property in each of these alloys, which is different from its main constituent.
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In which property does each of them differ from its main constituent?
(a) Stainless steel (b) Bronze
28. (a) What is an alloy?
(b) Name the alloy which has copper, nickel and zinc as its constituents.

(c) Write one chief use of the alloy mentioned in (b).
29. Name the alloys which are used for the following purposes:
(a) for soldering joints
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(c) for making aircraft and kitchenware
(d) for making equipment for food and dairy industry.
30. Why is sodium kept immersed in kerosene?
31. Write equations for the reactions of
(a) air with potassium and magnesium

(b) calcium and potassium with water
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33. Name one metal element and one nonmetal element which are obtained on a large scale generally from sea
water.
34. Name the reducing agent which reduces iron ore in the blast furnace.
35. Why is iron more useful when it is mixed with a little carbon?
36. What important properties of aluminium are responsible for its great demand in industry?
37. A trivalent metal X is manufactured by the process of electrolysis. It is the most abundant metal in the earth’s
crust. Identify the metal and state its two uses.
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39. Tick (9) the correct answer.
(i) Generally the number of electrons in the outermost shell of a metal atom is
(a) 1 ‰
(b) 1 to 3 ‰
(c) 5 to 8 ‰
(d) 8 ‰
(ii) Which of the following is not metallic?
(a) brass ‰
(b) neon ‰
(c) lead ‰
(d) calcium ‰
(iii) The best electrical conductor is
(a) gold ‰
(b) copper ‰