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

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

The reaction between hydrogen and oxygen gas to form water is ____________ reaction.

(a)

combination

(b)

redox

(c)

exothermic

(d)

all of these

Which among the following chemical reaction is an example of combination reaction?
(i) H_2(g)+ CI_2(g) ⟶ 2HCI_(g)
(ii) AnOH_(aq) + HCl_(aq) ⟶ NaCl_(aq) + H2O₍₁₎
(iii)2Mg(S)+ O_2(g) ⟶ 2MgO_(S)
(iv) Zn(S)+ 2HCI_(aq) ⟶ ZnCl₂ + H_2(g)

(a)

only (i)

(b)

both (i) and (iii)

(c)

only (iii)

(d)

both (i) and (ii)

Formation of ammonia from nitrogen and hydrogen is an example of __________ reaction.

(a)

Thermal decomposition

(b)

Combination

(c)

Precipitation

(d)

Displacement

Pick out the metal that displaces hydrogen from hydrochloric acid.

(a)

Zinc

(b)

Silver

(c)

Copper

(d)

Gold

Pb(NO₃)₂ + 2KI ⟶ Pbl₂ + 2KNO₃ is a ______________ reaction

(a)

neutralization

(b)

Precipitation

(c)

decomposition

(d)

Combustion

The value of ionic product of water at 25°C is ____________

(a)

1.00 x 10¹⁴

(b)

1.00 x 10^-14

(c)

1.00 X 10⁴

(d)

1.00 X 10^-4

Chemically rust is

(a)

hydrated ferrous oxide

(b)

Ferrous oxide

(c)

hydrated ferric oxide

(d)

Ferric oxide