WAEC Chemistry Past Questions & Answers - Page 163

811.

In a fixed volume of a gas, an increase in temperature results in an increase in pressure due to an increase in the

A.

number of the collisions between the gas molecules and the walls of the container

B.

kinetic energy of the gas

C.

number of collisions between the gas molecules

D.

number of repulsion between the gas molecules

Correct answer is A

No explanation has been provided for this answer.

812.
814.

If 5.00cm3 of 0.20 mol dm-3Na2CO3 was diluted with distilled water to obtain 250 cm3 solution, what is the concentration of the resulting solution?

A.

0.004 mol dm-3

B.

0.02 mol dm-3

C.

0.20mol dm-3

D.

0.40mol dm-3

Correct answer is A

No explanation has been provided for this answer.

815.

Which of the following compounds with the corresponding masses contain the highest percentage of nitrogen? [N = 14]

A.

NH3 = 17

B.

NH4CI = 53.5

C.

NH4NO3 = 80

D.

(NH3)2SO4 = 132

Correct answer is A

No explanation has been provided for this answer.