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Chemistry Past Questions and Answers

Neco Chemistry Questions

Question 71:

The boiling point of water is higher than the boiling point of ethanol because ____________

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A The bonding in water is electrovalent (ionic) whereas the bonding in ethanol is convalent
B The hydrogen bonding between water molecules is stronger than the hydrogen bonding between ethanol molecules
C Water has a higher lattice energy than ethanol.
D Water has hydrogen bonding between its molecules but ethanol has no hydrogen bonging between its molecules;
E Water is a better solvent than ethanol.

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Question 72:

The reaction C₂H₆ → C₂H + H₂ is known as ____________

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A Dehydration
B Dehydrogenation
C Displacement
D Hydrogenation
E Reduction

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Question 73:

Which is NOT a synthetic polymer?

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A Nylon
B Orion
C Perspex
D Polystyrene
E Wool

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Question 74:

A calcium atom and a calcium ion have the same ____________

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A Chemical properties
B Electric charge
C Electronic structure
D Number of electrons
E Number of neutrons

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Question 75:

Which compound will give propane when it Is dehy drated by an excess of hot, concentrated tetraoxosvlphate(VI) acid?

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A CH₃CH₂CHO
B CH₃CH₂CH2OH
C CH₃CH₂COQH
D CH₃CH₂0CH
E CH₃CH₃OH

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