Jamb Chemistry Past Questions and Answers

Question 251:

• JAMB 1981

What happens when the nitrates of potassium, calcium, zinc and copper are separately heated?

A. All the nitrate will decompose to their respective metals
B. The nitrates of calcium and potassium will decomposes to their nitrites
C. Only copper nitrate decomposes to the metal
D. Only the nitrates of zinc and copper will decompose to their oxides
E. The nitrates of calcium, zinc and copper decompose to their oxides

Question 252:

• 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 253:

• 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 254:

• 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 255:

• JAMB 1981

The IUPAC name for

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