Chemistry Past Questions For JAMB/WAEC/NECO Students v2

Chemistry Past Questions For JAMB/WAEC/NECO Students v2; These Chemistry questions are for students who are sitting for the following examinations:

HAVE YOU USED OUR JAMB TOOL YET? IT PROVIDES YOUR JAMB COMBINATION FOR FREE

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

Results

Good Job, Try Another Quiz

Read and try again, you can do it

#1. The number of waves in n x 10th Bohr's orbit are

A. n2

A. n2

B. n

B. n

C. n-2

C. n-2

D. n3

D. n3

#2. The mass of one Avogadro number of helium atom is

A. 1.00 gram

A. 1.00 gram

B. 4.00 gram

B. 4.00 gram

C. 8.00 gram

C. 8.00 gram

D. 4 x 6.02 x 1023 gram

D. 4 x 6.02 x 1023 gram

#3. The items amenable to detection by soft x-rays are

A. contrabands

A. contrabands

B. lead in bullets

B. lead in bullets

C. narcotics

C. narcotics

D. genuine coins from counterfeit coins

D. genuine coins from counterfeit coins

#4. The material which can be deformed permanently by heat and pressure is called a

A. thermoplastic

A. thermoplastic

B. thermoset

B. thermoset

C. chemical compound

C. chemical compound

D. polymer

D. polymer

#5. The mass number of a nucleus is

A. always less than its atomic number

A. always less than its atomic number

B. the sum of the number of protons and neutrons present in the nucleus

B. the sum of the number of protons and neutrons present in the nucleus

C. always more than the atomic weight

C. always more than the atomic weight

D. a fraction

D. a fraction

#6. The inexpensive and commonly used variety of glass is called soda glass. It is called so because

A. was used initially for making bottles of soda(carbonated drink)

A. was used initially for making bottles of soda(carbonated drink)

B. is made using soda(sodium carbonate)

B. is made using soda(sodium carbonate)

C. was initially used for storing sodium carbonate

C. was initially used for storing sodium carbonate

D. is made using soda lime

D. is made using soda lime

#7. The gas used in the manufacture of vanaspati from vegetable oil is

A. hydrogen

A. hydrogen

B. oxygen

B. oxygen

C. nitrogen

C. nitrogen

D. carbon dioxide

D. carbon dioxide

#8. The ionic radii of N3-, O2-, F- and Na+ follows the order

A. N3- > O2- > F- > Na+

A. N3- > O2- > F- > Na+

B. N3- > Na+ > O2- > F-

B. N3- > Na+ > O2- > F-

C. Na+ > O2- > N3- > F-

C. Na+ > O2- > N3- > F-

D. O2- > F- > Na+ > N3-

D. O2- > F- > Na+ > N3-

#9. The graphite rods in the nuclear reactor

A. react with U to release energy

A. react with U to release energy

B. produce neutrons

B. produce neutrons

C. undergo combustion which triggers the nuclear fission

C. undergo combustion which triggers the nuclear fission

D. convert fast moving neutrons into thermal neutrons

D. convert fast moving neutrons into thermal neutrons

#10. The first metal used by man was

A. iron

A. iron

B. copper

B. copper

C. gold

C. gold

D. bronze

D. bronze

#11. The hydronium ion is

A. H+

A. H+

B. HO -

B. HO -

C. H2+

C. H2+

D. H3O+

D. H3O+

#12. The most electropositive elements among the following is

A. Na

A. Na

B. Ca

B. Ca

C. K

C. K

D. Cs

D. Cs

#13. The method that cannot be used for removing permanent hardness of water is

A. adding sodium carbonate

A. adding sodium carbonate

B. distillation

B. distillation

C. adding caustic soda

C. adding caustic soda

D. boiling

D. boiling

#14. The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?

A. 3 billion years

A. 3 billion years

B. 100 years

B. 100 years

C. 0.01 minute

C. 0.01 minute

D. 13 days

D. 13 days

#15. The gas used for artificial ripening of green fruit is

A. ethylene

A. ethylene

B. ethane

B. ethane

C. carbon dioxide

C. carbon dioxide

D. acetylene

D. acetylene

#16. Zone refining is used for the purification of

A. Au

A. Au

B. Ge

B. Ge

C. Ag

C. Ag

D. Cu

D. Cu

#17. The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is

A. cineole

A. cineole

B. engenol

B. engenol

C. geraniol

C. geraniol

D. limonene

D. limonene

#18. The molecule which has the highest percentage of ionic character among the following is

A. HI

A. HI

B. HF

B. HF

C. HCI

C. HCI

D. HBr

D. HBr

#19. The high reactivity of fluorine is due to

A. its high electro negativity

A. its high electro negativity

B. small size of fluorine atom

B. small size of fluorine atom

C. availability of d-orbitals

C. availability of d-orbitals

D. strong F - F bond

D. strong F - F bond

#20. The iron ore magnetite consists of

A. Fe2O3

A. Fe2O3

B. Fe3OH4

B. Fe3OH4

C. FeCO3

C. FeCO3

D. 3Fe2O3 .. 3H2O

D. 3Fe2O3 .. 3H2O

#21. The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is

A. 5x/36

A. 5x/36

B. 5x

B. 5x

C. 7.2 x

C. 7.2 x

D. x/6

D. x/6

#22. The major constituent of air is

A. nitrogen

A. nitrogen

B. carbon dioxide

B. carbon dioxide

C. oxygen

C. oxygen

D. hydrogen

D. hydrogen

#23. The main chemical constituent of clay is

A. silicon oxide

A. silicon oxide

B. aluminium borosilicate

B. aluminium borosilicate

C. zeolites

C. zeolites

D. aluminium silicate

D. aluminium silicate

#24. The mineral containing both magnesium and calcium is

A. magnesite

A. magnesite

B. calcite

B. calcite

C. carnallite

C. carnallite

D. dolomite

D. dolomite

#25. The metal does not give H2 on treatment with dilute HCL is

A. Zn

A. Zn

B. Fe

B. Fe

C. Ag

C. Ag

D. Ca

D. Ca

#26. The number of g-molecule of oxygen in 6.02 x 1024CO molecules is

A. 1 gram of molecule

A. 1 gram of molecule

B. 0.5 gram of molecule

B. 0.5 gram of molecule

C. 5 gram of molecule

C. 5 gram of molecule

D. 10 gram of molecule

D. 10 gram of molecule

#27. The most extensive, commercially useful source of thorium as monazite sand occurs in India at

A. Orissa coast

A. Orissa coast

B. Travancore coast

B. Travancore coast

C. West Bengal coast

C. West Bengal coast

D. Gujarat coast

D. Gujarat coast

#28. The main active constituent of tea and coffee is

A. nicotine

A. nicotine

B. chlorophyll

B. chlorophyll

C. caffeine

C. caffeine

D. aspirin

D. aspirin

#29. The maximum number of isomers for an alkene with molecular formula C4H8 is

A. 5

A. 5

B. 4

B. 4

C. 2

C. 2

D. 3

D. 3

#30. The hardest form of carbon is

A. coke

A. coke

B. graphite

B. graphite

C. diamond

C. diamond

D. charcoal

D. charcoal

Finish

Practice other questions here

Practice other Chemistry questions here