Question

The reaction of formation hydrogen chloride from hydrogen and chloride represents following type of chemical reaction
i) decomposition
ii) displacement
iii) combination
iv) double-displacement

Answer 1

(iii)Combination
When hydrogen (H₂) combines with chlorine (Cl₂) to form hydrogen chloride (HCl), there is a combination of 2 reactants to give a single product.
H₂+Cl₂-------->2HCl

Answer 2

The answer is (iii) combination reaction since
2 reactants, namely H and Cl are combining to give HCl , a single product...
H₂+Cl₂->2HCl