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BEST ANSWER Certified by MeritNation Expert  
  1. The temperature of the reaction mixture rises when aluminium is added because it is an exothermic reaction.
  2. Reaction of sodium metal is found to be highly explosive because it is an exothermic reaction
  3. When lead is treated with hydrochloric acid, bubbles of hydrogen gas are evolved 

    Pb + 2HCl → PbCl2 + H2

Hope it helpzz!!!

Posted by Sweet Teddy(student)on 4/8/12

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 2nd

bcoz Na reacts highly with HCL to form NaCl and H2 gas

3rd

Pb reacts with HCL to form PbCl3 and the bubbles are the H2 gas.

Posted by Priya Singh(student)on 4/8/12

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