Answers

2016-05-07T07:08:47+05:30
Metal B is more reactive Hcl will not react with metals
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2016-05-07T09:05:46+05:30
Solutions 

Metal A is Sodium (Na) : 2,8,1

Metal B is Calcium (Ca) : 2,8,8,2.

Metal A (Sodium) is more reactive than metal B (Calcium).Reaction: -

i.                    Sodium metal reacts violently with dilute hydrochloric acid to form sodium chlorides and hydrogen.

2Na(a) + 2HCl(aq)→ 2NaCl(aq) + H2(g)

ii.                  Calcium reacts less vigorously to form calcium chloride and hydrogen.

Ca + 2HCl → CaCl2 + H2
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