Chemistry Past Questions For JAMB/WAEC/NECO Students v1

Chemistry Past Questions For JAMB/WAEC/NECO Students v1; These Chemistry questions are for students who are sitting for the following examinations:

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• JAMB
• Post-UTME / Post-JAMB
• WAEC
• NECO
• WAEC GCE
• NECO GCE
• NABTEB
• NABTEB GCE

Results

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#1. The nucleus of an atom consists of

A. electrons and neutrons

A. electrons and neutrons

B. electrons and protons

B. electrons and protons

C. protons and neutrons

C. protons and neutrons

D. All of the above

D. All of the above

#2. The number of moles of solute present in 1 kg of a solvent is called its

A. molality

A. molality

B. molarity

B. molarity

C. normality

C. normality

D. formality

D. formality

#3. The most electronegative element among the following is

A. sodium

A. sodium

B. bromine

B. bromine

C. fluorine

C. fluorine

D. oxygen

D. oxygen

#4. The metal used to recover copper from a solution of copper sulphate is

A. Na

A. Na

B. Ag

B. Ag

C. Hg

C. Hg

D. Fe

D. Fe

#5. The number of d-electrons in Fe2+ (Z = 26) is not equal to that of

A. p-electrons in Ne(Z = 10)

A. p-electrons in Ne(Z = 10)

B. s-electrons in Mg(Z = 12)

B. s-electrons in Mg(Z = 12)

C. d-electrons in Fe(Z = 26)

C. d-electrons in Fe(Z = 26)

D. p-electrons in CI(Z = 17)

D. p-electrons in CI(Z = 17)

#6. The metallurgical process in which a metal is obtained in a fused state is called

A. smelting

A. smelting

B. roasting

B. roasting

C. calcinations

C. calcinations

D. froth floatation

D. froth floatation

#7. The molecules of which gas have highest speed?

A. H2 at -73oC

A. H2 at -73oC

B. CH4 at 300 K

B. CH4 at 300 K

C. N2 at 1,027oC

C. N2 at 1,027oC

D. O2 at 0oC

D. O2 at 0oC

#8. The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth;s early life and solidified into hard rock's called

A. granite

A. granite

B. basalt

B. basalt

C. igneous rocks

C. igneous rocks

D. sedimentary rocks

D. sedimentary rocks

#9. The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is

A. Dalton's law

A. Dalton's law

B. Gay Lussac's law

B. Gay Lussac's law

C. Henry's law

C. Henry's law

D. Raoult's law

D. Raoult's law

#10. The main buffer system of the human blood is

A. H2CO3 - HCO3

A. H2CO3 - HCO3

B. H2CO3 - CO32-

B. H2CO3 - CO32-

C. CH3COOH - CH3COO-

C. CH3COOH - CH3COO-

D. NH2CONH2 - NH2CONH+

D. NH2CONH2 - NH2CONH+

#11. The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is

A. helium

A. helium

B. ozone

B. ozone

C. oxygen

C. oxygen

D. methane

D. methane

#12. The most commonly used bleaching agent is

A. alcohol

A. alcohol

B. carbon dioxide

B. carbon dioxide

C. chlorine

C. chlorine

D. sodium chlorine

D. sodium chlorine

#13. The nucleus of a hydrogen atom consists of

A. 1 proton only

A. 1 proton only

B. 1 proton + 2 neutron

B. 1 proton + 2 neutron

C. 1 neutron only

C. 1 neutron only

D. 1 electron only

D. 1 electron only

#14. The heat required to raise the temperature of body by 1 K is called

A. specific heat

A. specific heat

B. thermal capacity

B. thermal capacity

C. water equivalent

C. water equivalent

D. None of the above

D. None of the above

#15. The nuclear particles which are assumed to hold the nucleons together are

A. electrons

A. electrons

B. positrons

B. positrons

C. neutrons

C. neutrons

D. mesons

D. mesons

#16. The mass of P4O10 that will be obtained from the reaction of 1.33 gram of P4 and 5.07 of oxygen is

A. 2.05 gram

A. 2.05 gram

B. 3.05 gram

B. 3.05 gram

C. 4.05 gram

C. 4.05 gram

D. 5.05 gram

D. 5.05 gram

#17. The octane number of zero is assigned to

A. 2-methyl octane

A. 2-methyl octane

B. n-heptane

B. n-heptane

C. iso-octane

C. iso-octane

D. 3-methyl octane

D. 3-methyl octane

#18. The metal that is used as a catalyst in the hydrogenation of oils is

A. Ni

A. Ni

B. Pb

B. Pb

C. Cu

C. Cu

D. Pt

D. Pt

#19. The most abundant rare gas in the atmosphere is

A. He

A. He

B. Ne

B. Ne

C. Ar

C. Ar

D. Xe

D. Xe

#20. The Latin word formica means ant. The name formic acid is derived from this Latin word because

A. this acid, in ancient times, was used to eliminate ant-hills

A. this acid, in ancient times, was used to eliminate ant-hills

B. this corrosive acid is secreted by ants to drive away their enemies

B. this corrosive acid is secreted by ants to drive away their enemies

C. this acid was first obtained by the distillation of ants

C. this acid was first obtained by the distillation of ants

D. ants are attracted by the odour of this acid

D. ants are attracted by the odour of this acid

#21. The ore which is found in abundance in India is

A. monazite

A. monazite

B. fluorspar

B. fluorspar

C. bauxite

C. bauxite

D. magnetite

D. magnetite

#22. The inherited traits of an organism are controlled by

A. RNA molecules

A. RNA molecules

B. nucleotides

B. nucleotides

C. DNA molecules

C. DNA molecules

D. enzymes

D. enzymes

#23. The heat energy produced when the human body metabolises 1 gram of fat is

A. 30 KJ

A. 30 KJ

B. 1 KJ

B. 1 KJ

C. 39 KJ

C. 39 KJ

D. 29 KJ

D. 29 KJ

#24. What are the number of moles of CO2 which contains 16 g of oxygen?

A. 0.5 mole

A. 0.5 mole

B. 0.2 mole

B. 0.2 mole

C. 0.4 mole

C. 0.4 mole

D. 0.25 mole

D. 0.25 mole

#25. he main use of salt in the diet is to

A. make the taste of food better

A. make the taste of food better

B. produce in small amounts the hydrochloric acid required for the digestion of food

B. produce in small amounts the hydrochloric acid required for the digestion of food

C. ease the process of cooking

C. ease the process of cooking

D. increase the solubility of food particles in water

D. increase the solubility of food particles in water

#26. The monomer of polythene is

A. vinyl chloride

A. vinyl chloride

B. ethylene

B. ethylene

C. ethyl alcohol

C. ethyl alcohol

D. None of the above

D. None of the above

#27. The luster of a metal is due to

A. its high density

A. its high density

B. its high polishing

B. its high polishing

C. its chemical inertness

C. its chemical inertness

D. presence of free electrons

D. presence of free electrons

#28. The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is

A. 1.568 x 103

A. 1.568 x 103

B. 6.023 x 1019

B. 6.023 x 1019

C. 4.84 x 1017

C. 4.84 x 1017

D. 6.023 x 1023

D. 6.023 x 1023

#29. The most malleable metal is

A. platinum

A. platinum

B. silver

B. silver

C. iron

C. iron

D. gold

D. gold

#30. The oil used in the froth floatation process is

A. coconut oil

A. coconut oil

B. olive oil

B. olive oil

C. kerosene oil

C. kerosene oil

D. pine oil

D. pine oil

Finish

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