Jamb Chemistry 1987 Past Questions and Answers

Question 11:

• JAMB 1987

Corrosion is exhibited by?

A. Iron only
B. Electropostive metals
C. Metals below hydrogen inthe electrochemical series
D. All metals

Question 12:

• JAMB 1987

Inspite of the electronic configuration, 1s²2s²2p², carbon is tetraavalent because?

A. The electrons in both 2s and 2p orbitals have equal energy
B. The electrons in both 2s and 2p orbitals are equivalent
C. Both the 2s and 2p orbitals hybridizes
D. The six orbitals hybridize to four

Question 13:

• JAMB 1987

Which of the following compounds will give a precipitate with an aqueous ammoniacal solution of copper (l) chloride?

A. CH₃ = CHCH₃
B. CH₃ ≡ CCH₃
C. HC = C-CH₂CH₃
D. CH₂ = CH-CH = CH₂

Question 14:

• JAMB 1987

The efficiency of petrol as a fuel in high-compression internal combustion engines improves with an increase in the amount of?

A. Branched chain alkanes
B. Straight chain alkanes
C. Cycloalkanes
D. Halogenated hydrocarbons

Question 15:

• JAMB 1987

Ethanol reacts with aqueous sodium mono-oxoio date (l) to give a bright yellow solid with a characteristic smell. The product is?

A. Trichloromethane
B. Triodomethane
C. Iodoethane
D. Ethanal