1) Describe how Iron and Lead react with hydrochloric acid. Write
balanced equations for the reactions.
2) Write a rule for the reaction of a metal with:
a) Oxides of other metals
b) Solutions of compounds of other metals
3) Will Copper react with lead (II) oxide? Explain why.
4) Tin does not react with Iron (II) oxide. But it reduces Lead (II)oxide
to lead. Arrange Tin, Iron and Lead in order of decreasing reactivity.
5) Name the product of burning sulphur in air
6) The metal Sodium burns in Oxygen with bright yellow flame to form
Sodium -Oxide.
a) Write the balanced chemical equation for the reaction between
Sodium and Oxygen
b) What is formula of Sodium Oxide?
c) Name this type of oxide
d) Predict whether Sodium Oxide is solid, liquid or gas at room
temperature.
Answers
Answer:
1. Give an example of a metal which
(i) is a liquid at room temperature.
(ii) cart be easily cut with knife.
(iii) is the best conductor of heat.
(iv) is a poor conductor of heat.
Ans. (i) Mercury (Hg)
(ii) Sodium and potassium
(iii) Silver and copper
(iv) Lead -.
2. Explain the meanings of malleable and ductile.
Ans. Malleable: A metal is said to be malleable if it can be beaten into thin sheets, e.g. silver and gold are the best malleable metals.
Ductile: A metal is said to be ductile when it can be drawn into thin wires, e.g. silver and gold are the best ductile metals.
3. Why is sodium kept immersed in kerosene oil?
Ans. Sodium is highly reactive metal. It reacts with oxygen in air at room temperature, the reaction is highly exothermic. To prevent this sodium is kept preserved under kerosene. Sodium does not react with kerosene.
4. Write equations for the reactions of
(i) iron with steam
(ii) calcium and potassium with water
Ans. (i) Iron with steam