WAEC Chemistry Past Questions & Answers - Page 190

946.

Determine the amount of electrons needed to deposit 6.4g of copper during the electrolysis of copper (ll) tetraoxosulphate (IV) solution [Cu = 64]

A.

0.10 mole

B.

0.20 mole

C.

1.0 mole

D.

2.0 mole

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

947.

Which of the following statements is/are correct about tin plating? l The electrolyte must be a soluble salt of tin ll. the objective to be plated is made the cathode lll. The anode is made of tin lV. The negative electrode dissolves

A.

L only

B.

l and ll only

C.

l,ll and lll only

D.

l, ll and lV only

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

948.

Five metals represented by the letters V to Z are arranged in order of their reactivity as shown . V>W>X>Y>Z.
Which of the metals is most likely extracted by the electrolysis of its fused chloride?

A.

V

B.

W

C.

X

D.

Z

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

949.

Five metals represented by the letters V to Z are arranged in order of their reactivity as shown . V>W>X>Y>Z.
Which of the metals cannot displace Y from an aqueous solution of its salt?

A.

V

B.

W

C.

X

D.

Z

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

950.

Consider the electrochemical cell represented below Zn(s)/Zn2+(aq)//Cu2+(aq)/Cu(s). Which of the following equations describes the reaction occurring in the cell?

A.

Cu(s) + Zn2+(aq) →Cu2+(aq) + Zn(s)

B.

Cu(s) + Zn(s) →Cu2+(aq) + Zn2+(aq)

C.

Zn(s) + Cu2+(aq) →Zn2+(aq) + Cu(s)

D.

Zn2+(aq) +Cu2+(aq) → Zn(s) + Cu(s)

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.


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