Jamb Chemistry 1981 Past Questions and Answers

Question 46:

• JAMB 1981

The scale formation in a kinetic used for boiling water is caused by the presence in water of?

A. Calcium sulphate
B. Calcium carbonate
C. Calcium hydrogen carbonate
D. Calcium hydroxide
E. Magnesium sulphate

Question 47:

• JAMB 1981

An efflorescent compound is a substance that?

A. Absorbs water froom the air without dissolving in it
B. Is capable of giving off coloured luminosity
C. Gives out water to the atmosphere
D. Absorbs water from the air and dissolves in it
E. Gives out its water of crystallization on heating

Question 48:

• JAMB 1981

The general formula of an alkyl halide (which represent the halide) is?

A. C_nH_2n - ₂X
B. C_nH_2n + ₁X
C. C_nH_2n + ₂X
D. C_nH_2nX
E. C_nH_2n - 1

Question 49:

• JAMB 1981

The IUPAC name for

A. 1-methlpentane
B. 3-methylbutane
C. 2-methylbutane
D. 1-dimethylpropane
E. 2-methylpentane