Photolysis is a decomposition reaction caused by __________

(a)

heat

(b)

electricity

(c)

light

(d)

mechanical energy

A single displacement reaction is represented by X_(s) + 2HCl_(aq) → XCl_2(aq) + H_2(g). Which of the following(s) could be X. (i) Zn (ii) Ag (iii) Cu (iv) Mg. Choose the best pair.

(a)

i and ii

(b)

ii and iii

(c)

iii and iv

(d)

i 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

Powdered CaCO₃ reacts more rapidly than flaky CaCO₃ because of __________.

(a)

large surface area

(b)

high pressure

(c)

high concentration

(d)

high temperature

The normal pH of human blood is _________

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7.4 (7.3 - 7.45)

Electrolysis is type of _______________ reaction

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decomposition

Chemical volcano is an example for _______________ type of reaction

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Decomposition reaction

The ion formed by dissolution of H⁺ in water is called _______________

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Hydronium ion

When an aqueous solution of potassium chloride is added to an aqueous solution of silver nitrate, a white precipitate is formed. Give the chemical equation of this reaction

Why does the reaction rate of a reaction increase on raising the temperature?

Differentiate reversible and irreversible reactions.

What are called thermolysis reactions?

What is a chemical equilibrium? What are its characteristics?

Lemon juice has a pH 2, what is the concentration of H⁺ ions?