JAMB Past Questions and Answers - Page 1647

8,231.

Crude copper could be purified by the electrolysis of concentrated copper (II) chloride if the crude copper is?

A.

made both the anode and the cathode

B.

made the cathode

C.

made the anode

D.

dissolved in the solution

Correct answer is C

No explanation has been provided for this answer.

8,232.

What volume of oxygen measured at s.t.p would be liberated on electrolysis by 9650 coulombs of electricity?

(Molar volume of gas = 22.4 dm\(^3\), F = 96,500 C mol-)

A.

22.4 dm3

B.

11.2 dm3

C.

1.12 dm3

D.

0.560 dm3

Correct answer is D

For a diatomic divalent element like oxygen:

4 faraday (4 *  96,500) = 1 mole of the element  = Molar volume of gas = 22.4

: 4 *  96,500 = 22.4

  9650 = x 

: x = \(\frac{9650 * 22.4}{ 4 *  96,500}\)

x = 0.56dm\(^3\)

 

8,233.

Which Yoruba city-state was the last to fall to British colonial rule in the late 19th century?

A.

Abeokuta

B.

Oyo

C.

Lagos

D.

Ibadan

Correct answer is A

Abeokuta was the last Yoruba city-state to fall to British colonial rule in the late 19th century. The British had already established control over other Yoruba city-states like Lagos, Oyo, and Ibadan. However, Abeokuta resisted British rule for a long time before finally succumbing to it.

 

8,235.

Which of the following compounds is a base?

A.

CO2

B.

CaO

C.

H3PO3

D.

CH3COOCH3

Correct answer is B

No explanation has been provided for this answer.