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Chemistry Past Questions and Answers

Jamb Chemistry Questions

Question 11:

An example of a hygroscopic substance is

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A CuO _(S).
B MgCL_2(S).
C CaCL_2(S).
D NaOH_(S).

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Question 12:

If 24.4 g of lead (ll) trioxonitrate (V) were dissolved in 42 g of distilled water at 20^oC; calculate the solubility of the solute in gdm^-3.

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A 581.000.
B 0.581
C 5.810
D 58.100

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Question 13:

The solvent used for removing grease stain is

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A Turpentine
B Ammonia solution
C Ethanol
D Solution of borax in water

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Question 14:

In a water body, too much sewage leads to

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A A decrease in the temperature of the water which cause in death of aquatic animals
B An increase in the number of aquatic animals in the water
C An increase in the bacterial population which reduces the level of oxygen in the water
D A decrease in the bacterial population which increases the level of oxygen in the water

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Question 15:

10.0 dm³ of water was added to 2.0 mol dm^-3 of 2.5dm³ solution of HCl. What is the concentration of the final solution in mol dm^-3?

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A 0.4
B 8.0
C 2.0
D 0.5

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