WAEC Chemistry Past Questions & Answers - Page 284

1,416.

A sample of orange juice is suspected to have been contaminated with a yellow dye. Which of the following methods can be used to detect the dye?

A.

Decantation

B.

Chromatography

C.

Distillation

D.

Filtration

E.

Evaporation

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,417.

Which of the following reaction will not take place under normal conditions?

A.

Zn(s) + 2HCI2(aq) + H 2(g)

B.

Fe (s) + H 2SO4(aq) → FeSO4(aq) + H2(g)

C.

Cu (s) + 2HCI (aq) → CuCI 2(aq) + H2(g)

D.

Ca(s) + 2H Ca(OH)2(g)

E.

2Na(s) + 2H 2O (1) → 2NaOH(aq) + H2(g)

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,418.

Catalytic hydrogenation of oils results in the production of

A.

soaps

B.

detergents

C.

alkanes

D.

butter

E.

margarine

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

1,419.

What is the voltage of the cell represented at Zn(s) Zn 2+(aq) /Cu2+(aq) /Cu(s) given that for Cu 2+(aq)/ Cu (s) Eo = 0.337V and for Zn2+(aq) /Zn(s)' E o = -0.763V?

A.

+0.426V

B.

-0.426V

C.

-0.337V

D.

-1.10V

E.

+1.10V

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

1,420.

The oxidation number of chlorine is + 1 in

A.

KCIO 3

B.

CI 2O 7

C.

ZnCI2

D.

HCI

E.

NaCIO

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.


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