Year : 
1989
Title : 
Chemistry
Exam : 
JAMB Exam

Paper 1 | Objectives

21 - 30 of 49 Questions

# Question Ans
21.

The combustion of ethene, C 2H 4, is given by the equation C 2H 4 + 30 2 → 2CO2 + 2H2 O; ∆H = - 1428 KJ. If the molar heats of formation of water and carbon (IV) oxide are - 286 kJ and - 396 kJ respectively, calculate the molar heat of formation of ethene in KJ

A. - 2792

B. + 2792

C. - 64

D. + 64

D
22.

Which of the following represents the balanced equation for the reaction of copper with concentrated trioxonitrate (V) acid?

A. Cu (s) + 2HNO 3(aq) → Cu (NO 3) 2(aq) + H 2(g)

B. Cu (s) + 4HNO 3(aq) → Cu (NO 3) 2(aq) + 2H 2O (1) + 2NO 2(g)

C. 3Cu (s) + 8HNO3(aq) → 3Cu (NO3)2(aq) + 4H2O(1) + 2NO(g)

D. 3Cu(s) + 4HNO3(aq) → 3Cu(NO 3) 2(aq) + 2H 2O (1) + 2NO (g)

B
23.

The catalyst used in the contact process for the manufacture of tetraoxosulphate (VI) acid is

A. manganes (IV) oxide

B. manganese (ll) tetraoxosulphate (VI)

C. vanadium (V) oxide

D. iron metal

C
24.

Some products of destructive distillation of coal are?

A. carbon (IV) oxide and ethanoic acid

B. trioxocarbonate (IV) acid and methanoic acid

C. producer gas and water gas

D. coke and ammoniacal liquor

Detailed Solution

Heating coal, in the absence of air, is known as destructive distillation of coal. It yields various useful products like coke, coal gas, coal tar, and ammoniacal liquor.
25.

Gunpower is made from charcoal, sulphur and potassium trioxonitrate (V) The salt in the mixture performs the function of

A. an oxidant

B. a reductant

C. a solvent

D. a catalyst

A
26.

Which of the following reactions is (are) feasible?
I Br (1) + 2CI 2(aq) 2Br (aq) + CI 2(g)
ll 21 (aq) + Br 2(1) 2Br (aq) + 1 2(s)
lll 2F (aq) + CI 2(g) 2CI (aq) + F 2(g) IV 2F (aq)

A. l

B. ll

C. l and lll

D. lll and lV

B
27.

Bleaching powder, CaOCI2, H2O, deteriorates on exposure to air because

A. it loses its water of crystallization

B. atmospheric nitrogen displaces chlorine from it

C. carbon (IV) oxide of the atmosphere displaceschlorine from it

D. bleaching agents should be stored in solution

C
28.

The products of the thermal decomposition of ammonium trioxonitrate (V) are

A. NO 2 and oxygen

B. NH3 and oxygen

C. nitrogen and water

D. N2O and water

D
29.

The scale of a chemical balance is made of iron plate and coated with copper electrolytically because

A. iron is less susceptible to corrosion than copper

B. copper is twice as less susceptitible to corrosion as iron

C. copper is less susceptible to corrosion than iron

D. copper and iron are equally susceptible to corrosion

C
30.

A metal is extracted from its ore by the electrolysis of its molten chloride and it displaces lead from lead (ll) trioxonitrate (V) solution. The metal is

A. copper

B. aluminium

C. zinc

D. sodium

D
21.

The combustion of ethene, C 2H 4, is given by the equation C 2H 4 + 30 2 → 2CO2 + 2H2 O; ∆H = - 1428 KJ. If the molar heats of formation of water and carbon (IV) oxide are - 286 kJ and - 396 kJ respectively, calculate the molar heat of formation of ethene in KJ

A. - 2792

B. + 2792

C. - 64

D. + 64

D
22.

Which of the following represents the balanced equation for the reaction of copper with concentrated trioxonitrate (V) acid?

A. Cu (s) + 2HNO 3(aq) → Cu (NO 3) 2(aq) + H 2(g)

B. Cu (s) + 4HNO 3(aq) → Cu (NO 3) 2(aq) + 2H 2O (1) + 2NO 2(g)

C. 3Cu (s) + 8HNO3(aq) → 3Cu (NO3)2(aq) + 4H2O(1) + 2NO(g)

D. 3Cu(s) + 4HNO3(aq) → 3Cu(NO 3) 2(aq) + 2H 2O (1) + 2NO (g)

B
23.

The catalyst used in the contact process for the manufacture of tetraoxosulphate (VI) acid is

A. manganes (IV) oxide

B. manganese (ll) tetraoxosulphate (VI)

C. vanadium (V) oxide

D. iron metal

C
24.

Some products of destructive distillation of coal are?

A. carbon (IV) oxide and ethanoic acid

B. trioxocarbonate (IV) acid and methanoic acid

C. producer gas and water gas

D. coke and ammoniacal liquor

Detailed Solution

Heating coal, in the absence of air, is known as destructive distillation of coal. It yields various useful products like coke, coal gas, coal tar, and ammoniacal liquor.
25.

Gunpower is made from charcoal, sulphur and potassium trioxonitrate (V) The salt in the mixture performs the function of

A. an oxidant

B. a reductant

C. a solvent

D. a catalyst

A
26.

Which of the following reactions is (are) feasible?
I Br (1) + 2CI 2(aq) 2Br (aq) + CI 2(g)
ll 21 (aq) + Br 2(1) 2Br (aq) + 1 2(s)
lll 2F (aq) + CI 2(g) 2CI (aq) + F 2(g) IV 2F (aq)

A. l

B. ll

C. l and lll

D. lll and lV

B
27.

Bleaching powder, CaOCI2, H2O, deteriorates on exposure to air because

A. it loses its water of crystallization

B. atmospheric nitrogen displaces chlorine from it

C. carbon (IV) oxide of the atmosphere displaceschlorine from it

D. bleaching agents should be stored in solution

C
28.

The products of the thermal decomposition of ammonium trioxonitrate (V) are

A. NO 2 and oxygen

B. NH3 and oxygen

C. nitrogen and water

D. N2O and water

D
29.

The scale of a chemical balance is made of iron plate and coated with copper electrolytically because

A. iron is less susceptible to corrosion than copper

B. copper is twice as less susceptitible to corrosion as iron

C. copper is less susceptible to corrosion than iron

D. copper and iron are equally susceptible to corrosion

C
30.

A metal is extracted from its ore by the electrolysis of its molten chloride and it displaces lead from lead (ll) trioxonitrate (V) solution. The metal is

A. copper

B. aluminium

C. zinc

D. sodium

D