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NECO Past Questions and Answers - Page 94

466.

Ethene decolourises acidified potassium tetraoxomanganate(VII) solution. Which gas will decolourise bromine water?

A.

CH₄

B.

C₂H₆

C.

C₃H₆

D.

C₃H₈

E.

C₆H₆

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

467.

Which method is used for the purification of copper from its ore?

A.

distillation

B.

electrochemical

C.

electrolysis

D.

neutralization

E.

reduction

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

468.

What is the concentration (in mol dm³) of a solution containing 28 g of potassium hydroxide per 100 cm³ of solution? (K=39; H=1; 0=16)

A.

0.01

B.

0.05

C.

0.1

D.

0.5

E.

2.8

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

469.

At s.t.p, a mole of chlorine occupies 22.4dm³. If the temperature is changed to 35°C and the pressure to 750mHg the of the new volume will be [Cl = 35.5]

A.

$^{\text{760 x 22.4 x 308}} \text{750 x 273x 35.5} dm^3$

B.

$^{\text{760 x 22.4 x 308}} \text{750 x 273}^x dm^3$

C.

$^{\text{750 x 22.4 x 35.5}} \text{760 x 273dm3}$

D.

$^{\text{760 x 22.4 x 35.5}} \text{750x22.3x273}$

E.

$^{\text{760 x 22.4 x 35.5}} \text{750 x 308dm3}$

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

470.

How many Faradays of electricity are required to liberate 9g of aluminium? [Al = 27]

A.

0.1

B.

0.3

C.

1

D.

2.7

E.

3

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

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