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Metal A has electronic configuration of

2,8,1 and metal B has 2,8,8,2 which is more
reactive. Identify these metals and give their
reactions with dil HCl.

MSCERT Class 10 General Science Ch8 Understanding Metals and Non Metals


Metal B is more reactive Hcl will not react with metals
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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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