Question

(2) Name the alloy 2.
62. When a black metal compound XO is heated with a colourless gas Yą, then metal X and another compound
Y O are formed. Metal X is red-brown in colour which does not react with dilute acids at all. Gas Y can be
prepared by the action of a dilute acid on any active metal. The compound Y O is a liquid at room temperature
which can turn anhydrous copper sulphate blue.
(a) What do you think is metal X ?
(b) What could be gas Y2?
(c) What is compound XO ?
(d) What is compound Y2O ?
(e) Write the chemical equation of the reaction which takes place on heating XO with Y2.
( What type of chemical reaction is illustrated in the above equation ?
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Answer 1

Answer:

Brass and bronze are the two alloys

Answer 2

Answer:

i) Metal X is Copper, as Copper oxide when reacts with Hydrogen gives Copper and Water.

ii) Gas Y2 is Hydrogen, since it reacts with Copper oxide to give Copper and Water.

iii) Compound XO is Copper oxide (CuO) since it reacts with Hydrogen and gives Copper and Water.

iv) Compound Y20 is Water (H2O), as Copper oxide when reacts with Hydrogen gives Water and Copper.

v) The chemical reaction which takes place on heating XO with Y2 is - CuO+H2 -> Cu+H2O.

vi) This kind of reaction is called

displacement reaction as copper is being displaced by hydrogen from its oxide to form water.

Explanation:

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