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Chemistry Past Questions and Answers

Jamb Chemistry Questions

Question 16:

A sample of hard water contains some calcium sulphate and calcium hydrogen carbonate. The total hardness may therefore be removed by

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A Boiling the water
B Adding excess calcium hydroxide
C Adding a calculated amount of calcium hydroxide
D Adding sodium carbonate
E Adding magnesium hydroxide

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Question 17:

During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment,

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A The litmus turns blue but no gas is evolved
B The litmus turns blue and oxygen is evolved
C The litmus turns blue and hydrogen is evolved
D The litmus turns red and oxygen is evolved
E The litmus turns red and then becomes colourless

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Question 18:

The reaction between an organic acid and an alcohol in the presence of an acid catalyst is known as;

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A Saponification
B Dehydration
C Esterification
D Hydrolysis
E Hydration

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Question 19:

The IUPAC names of the compounds CH3COOH and CH2=CH2 are respectively;

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A Acetic acid and ethene
B Methanoic acid and ethene
C Methanoic acid and ethylene
D Ethanol and ethene
E Acetic acid and ethylene

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Question 20:

If 30cm³ of oxygen diffuses through a porous pot in 7 seconds, how long will it take 60cm³ of chlorine to diffuse through the same pot, if the vapour densities of oxygen and chlorine are 16 and 36 respectively?

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A 9.3 sec
B 14 sec
C 21 sec
D 28 sec
E 30.3 sec

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