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Chemistry Past Questions and Answers

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Chemistry Questions

Question 251:

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

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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

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Question 252:

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 253:

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 254:

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

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A C<sub style='font-size: smaller;'>n</sub>H<sub style='font-size: smaller;'>2n</sub> - <sub style='font-size: smaller;'>2</sub>X
B C<sub style='font-size: smaller;'>n</sub>H<sub style='font-size: smaller;'>2n</sub> + <sub style='font-size: smaller;'>1</sub>X
C C<sub style='font-size: smaller;'>n</sub>H<sub style='font-size: smaller;'>2n</sub> + <sub style='font-size: smaller;'>2</sub>X
D C<sub style='font-size: smaller;'>n</sub>H<sub style='font-size: smaller;'>2n</sub>X
E C<sub style='font-size: smaller;'>n</sub>H<sub style='font-size: smaller;'>2n</sub> - 1

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Question 255:

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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