2022 WAEC (WASSCE) Chemistry Past Questions

Wood carving, leather work, and cloth weaving are examples of?

1. A.chemical industry
2. B.power industry✓ Correct
3. C.heavy industry
4. D.local craft industry

Simplify: $\sqrt{108} + \sqrt{125} - \sqrt{75}$

1. A.$\sqrt{3} + 5\sqrt{5}$✓ Correct
2. B.$6 \sqrt{3} - 5 \sqrt{5}$
3. C.$6 \sqrt{3} + \sqrt{2}$
4. D.$6\sqrt{3} - \sqrt{2}$

When concentrated sodium chloride solution is electrolysed using inert electrodes the products are?

1. A.oxygen and hydrogen
2. B.hydrogen and oxygen
3. C.sodium and oxygen
4. D.soduim hydroxide, hydrogen and chlorine

Three balls are drawn one after the other with replacement, from a bag containing 5 red, 9white and 4 blue identical balls, What is the probability that they are one red, one white and one blue?

1. A.5/102
2. B.5/136✓ Correct
3. C.5/162
4. D.5/204
5. E.5/243

In the diagram, |QR| = 5cm, PQR = 60o and PSR = 45o. Find |PS|, leaving your answe in surd form.

1. A.4$\sqrt{5}$cm
2. B.3$\sqrt{7}$cm
3. C.4$\sqrt{6}$cm✓ Correct
4. D.5$\sqrt{6}$cm

After the following sentence, a list of possible interpretations is given. Choose the interpretaion that is most appropriate for the sentence. Peter and Paul get along like a house on fire. This means that they

1. A.have a very good relationship
2. B.are not on speaking terms
3. C.avoid each other always✓ Correct
4. D.pretend to like each other

When two cells of negligible internal resistances and equal e.m.f. denoted by E$_1$ and E$_2$ are connected in parallel, combined e.m.f. E is given by

1. A.E = E$_1$ + E$_2$
2. B.$\frac{1}{E} = \frac{1}{E_1} + \frac{1}{E_2}$
3. C.E = E$_1$ = E$_2$
4. D.E = $\frac{E_1}{E_2}$✓ Correct

The scale of the map in Representative Fraction(RF) is

1. A.1:25,000
2. B.1:100,000
3. C.1:200,000
4. D.1:50,000✓ Correct

From the words or group of words lettered A to D, choose the word or group of words that best completes each of the following sentences. A meeting was called ..............the instance of the chairman.

1. A.by
2. B.for✓ Correct
3. C.on
4. D.at

From the words or group of words lettered A to D, choose the one that best completes each of the following sentences. Mr Johnson instructed his driver to ensure that the tank of the car is filled with.....for the long journey the next day

1. A.petrols
2. B.much petrol
3. C.petrol
4. D.a petrol✓ Correct