WAEC Chemistry Past Questions & Answers - Page 153

761.

When 100 cm³ of a saturated solution of KCIO₃ at 40^oC is evaporated, 14 g of the salt is recovered what is the solubility of KCIO₃ at 40^oC? [KCIO₃ = 122.5]

A.

11.42 mol dm^-3

B.

8.80 mol dm^-3

C.

1. 14 mol dm^-3

D.

0.88 mol dm^-3

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

762.

Consider the reaction represented by the question below: KOH_(aq) + HCI_(aq) → KCI_(aq) + H₂O_(l) What volume of 0.25 mol dm^-3 KOH would be required to completely neutralize 40 cm³ of 0.10 mol dm ^-3 HCI?

A.

40 cm³

B.

32cm³

C.

24cm³

D.

16cm³

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

763.

Which of the following compounds would dissolved in water to give a solution whose pH is less than 7?

A.

AI(NO₃)₃

B.

KNO₃

C.

N₂O

D.

NH₃

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

764.

An aqueous solution of CaCI₂ is

A.

acidic solution

B.

alkaline solution

C.

a buffer solution

D.

a neutral solution

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

765.

The colour of phenolphthalein indicator in dilute HNO is

A.

colourless

B.

orange

C.

pink

D.

purple

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

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