Answer:
(i) The temperature of
the reaction mixture rises when aluminium is added because it is an exothermic
reaction.
(ii) Reaction
of sodium metal is found to be highly explosive because it is an exothermic
reaction.
(iii) When lead is treated with hydrochloric acid, bubbles
of hydrogen gas are evolved.
Pb +
2HCl ® PbCl2 + H2
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