Which of the following metals
give inflammable gas with
both acid and base“?
(a) Na and Zn
(b) Mg and Al
(c) Mg and Be
(d) Zn and Al
Answers
We have to pick out the metals from the given options which give inflammable gas with both acid and base.
answer : option (d) Zn and Al.
explanation : first you should understand what the inflammable gas is ...
a gas which is highly combustible ( which can burn in the presence of oxygen) is known as inflammable gas. hydrogen is a well known inflammable gas.
in answer, I mentioned zinc and aluminium are the two metals which can give inflammable gas with both acid and base. because zinc and Aluminium are considered to have unique nature.
reason : They can react with acid and base (alkali) to form hydrogen and soluble salt. and I already mentioned that hydrogen is a inflammable gas.
it means Zinc and Aluminium give inflammable gas with both acid and base.
let's understand more deeply to see reaction,
zinc in basic medium (NaOH) :
Zn + 2NaOH = Na₂ZnO₂ + H₂ ↑ (inflammable gas)
zinc in acidic medium (H₂SO₄) :
Zn + H₂SO₄ = ZnSO₄ + H₂ ↑ (inflammable gas)
so you see, zinc gives inflammable gas with both acid and base.
similarly, you can treat aluminium in both medium.
aluminium in basic medium (NaOH) :
2Al + 6NaOH = 2Na₂AlO₃ + 3H₂ ( inflammable gas)
aluminium in acidic medium (HCl) :
2Al + 6HCl = 2AlCl₃ + 3H₂ ( inflammable gas)