JAMB Chemistry Past Questions & Answers - Page 209

1,041.

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

Correct answer is B

No explanation has been provided for this answer.

1,042.

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

Correct answer is A

No explanation has been provided for this answer.

1,043.

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

Correct answer is B

HC = C-CH2CH3

1,044.

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

Correct answer is C

both the 2s and 2p orbitals hydrodizes

1,045.

Corrosion is exhibited by?

A.

iron only

B.

electropostive metals

C.

metals below hydrogen inthe electrochemical series

D.

all metals

Correct answer is D

No explanation has been provided for this answer.