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Chemistry Past Questions and Answers

Jamb Chemistry Questions

Question 46:

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

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

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Question 47:

An efflorescent compound is a substance that?

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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

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Question 48:

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

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

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Question 49:

The IUPAC name for

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

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