WAEC Chemistry Past Questions & Answers - Page 182

906.

What of the following pairs of acid and base will produce a solution with pH less than 7 at equivalence point?

A.

HNO3 and NaOH

B.

H2SO4 and KOH

C.

HCI and Mg(OH) 2

D.

HNO 3 and KOH

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

907.

The reaction that takes place at the cathode when an aqueous solution of NaCI is electrolysed using carbon electrodes is

A.

2H+2(g) + 2e- → H2(g)

B.

Na+2(g) + e- → Na(s)

C.

4OH- → 2H2O(l) + O2(g) +4e-

D.

2CI- → CI2(g) + 2e-

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

908.

Which of the following compounds is a soapless detergent?

A.

C 12H 25OSO3Na

B.

C 17H 35COONa

C.

C 6H5OH3

D.

C 4H9COOC2H 5

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

909.

The mass of 800cm3 of a gas X at s.t.p. is 1.0g. What is the molar mass of X? [1 mole of a gas at s.t.p occupies 22.4dm 3]

A.

18.0g mol-1

B.

22.4g mol-1

C.

28.0gmol-1

D.

36.0gmol-1

View answer & explanation

Correct answer is C

The mass of 0.8dm3 of a gas at s.t.p. is 1.0g :. 22.4dm> of gas at s.t.p. will have a molar mass of 22.4/0.8 = 28.0g mol-1

910.

What is the IUPAC name of CH3CH2COOCH 3?

A.

Ethylethanoate

B.

Methylethanoate

C.

Methylpropanoate

D.

Propylmethanoate

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.


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