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NECO Past Questions and Answers - Page 102

506.

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.

507.

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.

508.

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.

509.

The molar mass of a compound X is 56. its empirical formula is CH2. X is

A.

butene

B.

butyne

C.

ethene

D.

propene

E.

propyne

View answer & explanation

Correct answer is A

$(CH_{2})x = 56$

$(12 + 2)x = 56$

$14x = 56$

$x = \frac{56}{14}$

$x = 4$

Hence, the empirical formula is $(CH_{2}) \times 4$

= $C_{4}H_{8}$

510.

Which compound will have the lowest boiling point?

A.

CH₃OH

B.

CH₃COOH

C.

CH₃CHOH

D.

C₄H₁₀

E.

(CH₃)₃CH

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

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