Photolysis is a decomposition reaction caused by __________

(a)

heat

(b)

electricity

(c)

light

(d)

mechanical energy

The chemical equation Na₂SO_4(aq) + BaCl_2(aq) → BaSO_4(s)↓ + 2NaCl_(aq) represents which of the following types of reaction?

(a)

Neutralisation

(b)

Combustion

(c)

Precipitation

(d)

Single displacement

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 represents a precipitation reaction?

(a)

A_(s) + B_(s) → C_(s) + D_(s)

(b)

A_(s) + B_(aq) → C_(aq) + D_(l)

(c)

A_(aq) + B_(aq) → C_(s) + D_(aq)

(d)

A_(aq) + B_(s) → C_(aq) + D_(l)

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

(a)

large surface area

(b)

high pressure

(c)

high concentration

(d)

high temperature