H_2(g) + Cl_29(g) → 2HCl_(g) is a

(a)

Decomposition Reaction

(b)

Combination Reaction

(c)

Single Displacement Reaction

(d)

Double Displacement Reaction

A reaction between carbon and oxygen is represented by C_(s) + O_2(g) → CO_2(g) + Heat. In which of the type(s), the above reaction can be classified?
(i) Combination Reaction
(ii) Combustion Reaction
(iii) Decomposition Reaction
(iv) Irreversible Reaction

(a)

i and ii

(b)

i and iv

(c)

i, ii and iii

(d)

i, ii and iv

Which of the following statements are correct about a chemical equilibrium?
(i) It is dynamic in nature
(ii) The rate of the forward and backward reactions are equal at equilibrium
(iii) Irreversible reactions do not attain chemical equilibrium
​​​​​​(iv) ​The concentration of reactants and products may be different

(a)

 i, ii and iii

(b)

i, ii and iv

(c)

ii, iii and iv

(d)

i, iii and iv

Which of the following is not an “element + element → compound” type reaction?

(a)

C_(s) + O_2(g) → CO_2(g)

(b)

2K_(s) + Br_2(l) → 2KBr_(s)

(c)

2CO_(g) + O_2(g) → 2CO_2(g)

(d)

4Fe_(s) + 3O_2(g) → 2Fe₂O_3(s)

The pH of a solution is 3. Its [OH^–] concentration is

(a)

1 × 10^–3 M

(b)

3M

(c)

1 × 10^–11 M

(d)

11 M