(1) Name two metals which do not react with oxygen
(2) Name two metals which catch fire if kept in open air
(3) Give the reaction if any when the following metals are treated wth copper sulphate solution;
(i)Pt
(ii) Zn
(iii) Ag
(4) Name the three metals which do not react with water at all
(5) A metal 'X' displaces metal 'Y' from Y2(SO4)3 aqueous solution. Which metal is most reactive 'X' or 'Y'?
(6) Metal is found to be present in vitamin B-12. Name the metal
(7) Which metal acts as anode during the electrolytic refining?
(8) Explain why the surface of some metals acquires dull appearance when exposed to air for a long time?
(9) Why are metals highly electropositive in nature?
(10) Why does zinc liberate hydrogen gas when it reacts with dilute hydrochloric acid but copper does not?
(11) All ores are minerals while all minerals are not ores, Elaborate?
(12) Why is sulphide ore converted to its oxide before reduction?
(13) Why is sodium kept immersed in kerosene oil?
(14) Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute H2SO4)
(15) What are amphoteric oxides? Give examples of two amphoteric oxides.
(16) State two ways to prevent the rusting of iron)
(17) What are metalloids?
(18) Define gangue?
(19) What is an amalgam?
(20) Which one of the following metals does not react with oxygen even at high temperatures?
(i)Calcium
(ii) Gold
(iii) Sodium
(21) Name two metals which are both ductile as well as malleable
(22) Write the chemical equation for the reaction of hot aluminum with steam
(23) A green layer is gradually formed on a copper plate left exposed to air for a week in a bathroom. What could this green substance be?
(24) Name an alloy of copper used for making utensils
(25) What is rust? Write its chemical formula
(26) Name two metals which do not corrode
(27) Which one of the metal in the following group are Au, Na, Cu, Ca? (a) most reactive (b) least reactive
(28) Which chemical element is alloyed with copper to make bronze?
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