WAEC Chemistry Past Questions & Answers - Page 72

356.

Which of the following reactions would take place when concentrated sodium hydroxide solution is added to palm oil?

A.

Esterification

B.

Neutralization

C.

Polymerization

D.

Saponification

Correct answer is D

No explanation has been provided for this answer.

357.

A compound has an empirical formular CH2O and molecular mass of 90.

[H = 1.00, C = 12.0, O = 16.0]

A.

C4H10O2

B.

C3H10O2

C.

C3H6O3

D.

C2H2O4

Correct answer is C

(CH2O)n = 90; (12 + (1 x 2) + 16)n = 90
(12 + 2 + 16)n = 90; 30n = 90; n = \(\frac{90}{30}\); n = 3
(CH2O)3 = Molecular formula ; = C3H6O3

358.

The complete hydrogenation of benzene gives

A.

Cyclohexene

B.

Cyclohexane

C.

Hexene

D.

Hexane

Correct answer is B

No explanation has been provided for this answer.

359.

Which of the following metals is the strongest reducing agent?

A.

Sodium

B.

Silver

C.

Potassium

D.

Copper

Correct answer is C

No explanation has been provided for this answer.

360.

Consider the following reaction equation:
CuO(s) + H2(g) \(\to\) Cu(s) + H2O(1)

Which substance is oxidized?

A.

Cu

B.

CuO

C.

H2

D.

H2O

Correct answer is C

No explanation has been provided for this answer.