Question

Which of the following involves combination of two elements ?
(a) N2(g) + 3H2(g) → 2NH3(g)
(b) CaO(s) + CO2(g) → CaCO3(g)
(c) 2SO2(g) + O2(g) → 2SO3f(g)
(d) NH3(g) + HCl(g) → NH4Cl(s)

Answer 1

Answer:

Option a and c

Explanation:

I think becoz in option a) nitrogen and hydrogen is used as per the option but if you consider catalyst too then it will not correct because of action of iron. And option b) has only sulphur and oxygen given as per the question, It is fully true as it has no action of catalyst. Hope it will help you. And plz mark me as the brainliest

Answer 2

Answer:

a) N2(g) + 3H2(g) → 2NH3(g)

Explanation:

Because nitrogen and hydrogen are two single elements. Therefore it is a rxn of combination of two elements.