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Chemistry Past Questions and Answers

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Chemistry Questions

Question 801:

The IUPAC nomenclature for the compound above is

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A Dimethlhexane
B 3,5 dimethylhexane
C 1.1 dmethyl, 3 methylpentane
D 2.4 dimethylhexane

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Question 802:

The function of the copper (ll)tetraoxosulphate (IV) in dilute H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> in the figure above is to

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A Dry the gas
B Absorb phosphine impurity
C Absorb ethene impurity
D From an acetylide with ethyne

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Question 803:

The dissolution of common salt in water is a physical change because

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A The salt can be obtained by crystallization
B The salt can be recovered by the evaporation of water
C Heat is not generated during mixing
D The solution will not boil at 100<sup style='font-size: smaller;'>o</sup>C

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Question 804:

At 25<sup style='font-size: smaller;'>o</sup>C and 1atm, a gas occupies a volume of 1.50dm<sup style='font-size: smaller;'>3</sup>. What volume will it occupy at 100<sup style='font-size: smaller;'>o</sup>C and 1atm?

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A 1.88 dm<sup style='font-size: smaller;'>3</sup>
B 6.00 dm<sup style='font-size: smaller;'>3</sup>
C 18.80 dm<sup style='font-size: smaller;'>3</sup>
D 18.80 dm<sup style='font-size: smaller;'>3</sup>
E 60.00dm<sup style='font-size: smaller;'>3</sup>

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Question 805:

A mixture of sand, ammonium chloride and sodium chloride is best separated by?

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A Sublimation followed by addition of water and filteration
B Sublimation followed by addition of water and evaporation
C Addition of water followed by filtration and sublimation
D Addition of water followed by crystallization and sublimation

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