NECO Chemistry Past Questions & Answers - Page 27

131.

A gas X diffuse through porous partition at the rate of 3 cm₃ per second. Under the same condition hydrogen diffused at the rate of 15 cm₃ per second.

What is the 42. relative molecular mass of X.

A.

5

B.

12

C.

18

D.

45

E.

50

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

132.

Faraday s first law of electrolysis can be expressed mathematically as

A.

m=I/it

B.

mαit

C.

Q=it

D.

QαI/it

E.

Qαit

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

133.

An experiment to test the conductance of 0,1 M solutions of the substances listed below was perform.
I ammonia
II ammonium chloride
III ethanoic acid
IV sodium ethanoate
Which pair of substances show the least conductance?

A.

I and II

B.

I and III

C.

I and IV

D.

II and III

E.

II and IV

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

134.

The best way to distinguish between Na₂CO₃and NaHCO₂ is by.

A.

adding an acid.

B.

adding an alkali.

C.

dissolving in water.

D.

exposing to air.

E.

heating

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

135.

The Kinetic theory can NOT be used to explain

A.

allotropy

B.

Brownian movement.

C.

diffusion

D.

Tyndal effect.

E.

vaporization

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

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