JAMB Chemistry 2000 Past Questions and Answers

Chemistry JAMB 2000 Q10 ✓ Answer: C

The electron configuration of 22X2+ ion is

A

ls2 2s2 2p6 3s2 3p6 4s2 3d2

B

ls2 2s2 2p6 3s2 3p6 4s2 3d1

C

ls2 2s2 2p6 3s2 3p6

D

ls2 2s2 2p6 3s2 3p6 4p2

Chemistry JAMB 2000 Q11 ✓ Answer: A

Which of the following types of bonding does not involves the formation of new substance?

A

Metallic

B

Covalent

C

Co-ordinate

D

Electrovalent

Chemistry JAMB 2000 Q12 ✓ Answer: B

The knowledge of half-life can be used to

A

create an element

B

detect an element

C

split an element

D

irradiate an element

Chemistry JAMB 2000 Q13 ✓ Answer: C

The shape of CO2,H2O and CH4 respectively are

A

bent linear and tetrahedral

B

bent tetrahedral and linear

C

linear bent and tetrahedral

D

tetrahedral, linear and bent.

Chemistry JAMB 2000 Q14 ✓ Answer: A

The distance between the nuclei of chlorine atoms in a chlorine molecule is 0.914 nm. The atomic radius of chlorine atom is

A

0.097 nm

B

0.914 nm

C

2.388 nm

D

2.388 nm

Chemistry JAMB 2000 Q15 ✓ Answer: A

The noble gas, argon, is used for

A

electric are welding

B

welding brass

C

underwater welding

D

steal welding

Chemistry JAMB 2000 Q18 ✓ Answer: D

The air pollutant unknown in nature is

A

NO

B

CO

C

HCHO

D

DDT [PAGE 58]

Chemistry JAMB 2000 Q19 ✓ Answer: D

10dm3 of distilled water used to wash 2.0 g of a precipitate of AgCl. If the solubility product of AgCl is 2.0 x10-10 moldm-6, what quantity of silver was lost in the process?

A

2.029 x10-3 mol dm-3

B

1.414 x 10-3 mol dm-3

C

2.029 x 10-5 mol dm-3

D

1.414 x 10-5 mol dm-3

Chemistry JAMB 2000 Q20 ✓ Answer: D

Hydration of ions in solution is associated with

A

absorption of heat

B

reduction of heat

C

conduction of heat

D

liberation of heat

Chemistry JAMB 2000 Q21 ✓ Answer: C

The diagram above is the solubility curve of solute, X. Find the amount of X deposited when 500cm3 of solution of X is cooled from 60oC to 20oC

A

0.745 mole

B

0.950 mole

C

2.375 moles

D

4.750 moles.

Chemistry JAMB 2000 Q22 ✓ Answer: C

HCl(aq) + H2O(1) H3O+ (aq) + Cl- (aq) In the reaction above, Cl- (aq) is the

A

Conjugate acid

B

Acid

C

Conjugate base

D

Base.

Chemistry JAMB 2000 Q23 ✓ Answer: A

In which order are the following salts sensitive to light?

A

Agl ›AgCl ›AgBr

B

AgCl ›Agl ›AgBr

C

AgBr ›AgCl ›AgI

D

AgCl ›AgBr ›AgI

Chemistry JAMB 2000 Q24 ✓ Answer: B

Thee pOH of a solution of 0.25 mol dm-3 of hydrochloric acid is

A

12.40

B

13.40

C

14.40

D

14.60

Chemistry JAMB 2000 Q25 ✓ Answer: C

MnO4(aq) + 8H+ (aq) ’! Mn2+(aq)+4H2O(1) Y in the equation above represents

A

2e-

B

3e-

C

5e-

D

7e-

Chemistry JAMB 2000 Q26 ✓ Answer: C

½Zn2+ (aq)+e- ½Zn(s) In the reaction above, calculate the quantity of electricity required to discharge zinc

A

0.965 x 104 C

B

4.820 x 104 C

C

9.650 x 104 C

D

48.200 x 104 C [F = 96 500 C mol-1]

Chemistry JAMB 2000 Q27 ✓ Answer: A

Given that M is the mass of substance deposited in an electrolysis and Q the quantity of electricity consumed, then Faraday’s law can be written as

A

M = Z Q

B

M = Q Z

C

M = Z 2Q

D

-3 000 kJ mol-1 [C = 12, O = 16, H = 1] Specific heat capacity of water = 4.2 jg-1K-1

E

M = QZ 0.46g of ethanol when burned raised the temperature of 50 g water by 14.3 K. Calculate the heat of combustion of ethanol.

Chemistry JAMB 2000 Q29 ✓ Answer: C

Powdered marble reacts with hydrochloric acid solution than the granular form because the powdered form has

A

more molecules

B

more atoms

C

large surface are

D

relatively large mass

Chemistry JAMB 2000 Q30 ✓ Answer: A

The graph that describes a zero order reaction is

A

Rate Conc.

B

Rate Conc.

C

Rate Conc.

D

Rate Conc. [PAGE 59]

Chemistry JAMB 2000 Q32 ✓ Answer: D

For a reaction in equilibrium, the species involved in the equilibrium constant expression are

A

gaseous and solid species

B

liquid and solid species

C

solid and dissolved species

D

gaseous and dissolved species

Chemistry JAMB 2000 Q34 ✓ Answer: C

The substance often used for vulcanization of rubber is

A

chlorine

B

hydrogen peroxide

C

sulphur

D

tetraoxosulphate (V1) acid

Chemistry JAMB 2000 Q36 ✓ Answer: A

The refreshing and characteristics taste of soda water and other soft drinks is as a result of the presence in them of

A

carbon(1V)oxide

B

carbon(11) oxide

C

soda

D

glucose

Chemistry JAMB 2000 Q38 ✓ Answer: D

Synthesic gas is a mixture of

A

CH4 and H2O

B

CH4 and H2

C

CO2 and H2

D

CO and H2

Chemistry JAMB 2000 Q39 ✓ Answer: C

Potassium vapour burns with a

A

blue-flame

B

brick-red flame

C

violet flame

D

golden-yellow flame

Chemistry JAMB 2000 Q41 ✓ Answer: C

Haematite is an ore of

A

Zinc

B

Lead

C

Iron

E

copper.

Chemistry JAMB 2000 Q42 ✓ Answer: D

The least easily oxidized of the metals below is

A

Ca

B

Na

C

Zn

D

Al

Chemistry JAMB 2000 Q43 ✓ Answer: B

The repeating unit in natural rubber is

A

alkynes

B

isoprene

C

n-propane

D

neoprene

Chemistry JAMB 2000 Q44 ✓ Answer: D

Unsaturated organic compounds are identified by decolourization of.

A

silver bromide and potassium tetraoxomanganate(v11) solution

B

bromine water and acidified potassium tetraoxomanganate(V11) solution

C

silver bromine solution and bromine water

D

bromine water and alkaline potassium tetraoxomanganate (V11) solution.

Chemistry JAMB 2000 Q45 ✓ Answer: C

The conditions necessary for thee extraction of a water molecule form two molecules of ethanol are.

A

less acid and a lower temperature

B

excess acid and a lower temperature

C

excess acid and a higher temperature

D

less acid and a higher temperature.

Chemistry JAMB 2000 Q46 ✓ Answer: A

The chlorinated alkane often used industrially to remove grease is

A

tetrachloromethane

B

chloromethane

C

trichloromethane

D

dichloromethane.

Chemistry JAMB 2000 Q47 ✓ Answer: A

The reaction of carbide with water gives

A

ethyne

B

ethane

C

ethane

D

Ethanal O

Chemistry JAMB 2000 Q48 ✓ Answer: B

CH3-CH2-C--OCH2CH3 The compound above is an

A

ether

B

ester

C

alkanal

D

alkanol

Chemistry JAMB 2000 Q49 ✓ Answer: B

Alkanone are generally obtained by the oxidation of

A

primary alkanols

B

secondary alkanols

C

tertiary alkanols

D

alkanoic acid

Chemistry JAMB 2000 Q50 ✓ Answer: B

Sucrose is made up to

A

glucose and glucose

B

glucose and fructose

C

fructose and fructose

D

galactose and glucose. [PAGE 60] Chemistry 2001

JAMB Chemistry 2000 past questions