Question

Mn,zn,fe and cu are given to a student . He is asked to indentify which of them
1)will not displace h2 from hcl
2) will react only with steam to give h2 (g)
3)will give h2 with 5% of hno3 .
Help him to do so with balanced chemical equations for each

Answer 1

Hey dear here is your answer!!!!

1) Copper (Cu) will not displace H2 from HCl as Copper is less reactive than hydrogen.

Reaction:-
Cu+HCl => no reaction
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2) Magnesium will react only with steam to produce white magnesium oxide and hydrogen gas .

Reaction :-
Mg +2 H2O =>Mg(OH)2 + H2
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3) Magnesium

Reaction:-
Mg(s) + 2HNO3 (aq) → Mg(NO3)2 (aq) + H2 (g)

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Hope it helps u....