WAEC GCE Chemistry Practical Questions 2021 and Answers Update

WAEC GCE Chemistry Practical Questions 2021 and Answers Update.

WAEC GCE Chemistry Practical Questions 2021 – As the 2021 WAEC GCE Chemistry practical examination is fast approaching, we have provided you with Chemistry Practical WAEC GCE expo questions on our website. Read on…

In this article, I will be showing you past WAEC GCE Chemistry Practical random repeated questions for free. You will also understand how the questions are set and many more examination details. All you need to do is to stay focus and follow this guide.

The West African Examinations Council (WAEC) is an examination board that conducts the West African Senior School Certificate Examination, for University and Jamb entry examination in West Africa countries. In a year, over three million candidates registered for the exams coordinated by WAEC.

WAEC GCE Chemistry Practical Questions 2021

3ai)
SO2(g)
3aii)
A->To dry the gas
B->To detect the type of gas that was dried
3aiii)
A->P4O10
B->KMno4/Blue litmus paper
3bi)
-It is an acid that turns moist blue litmus paper red
-It is colourless and poisonous gas with an irritating smell
3bII)
The irritating smell
3bii)
Downward delivery
Chlorine gas (Cl2(g))
3ci)
I-T,U,V
II-X,Y,Z
3cii)
W
3ciii)
I-U
II-V

(2a)
Inference: SO3^2- suspected

(2b)
(i) Inference: insoluble salt

(ii) Inference: SO3^2- confirmed

(iii) Inference: Cu2 suspected
Cu2 confirmed

(iv) Obseravation:
-Blue gelatinous precipitate
-Precipitate dissolves

(2c)
(i) CuSO3
(ii) Copper (ii) trioxosulphate (iv)

1a)
i) TABULATE
burette reading/cm^3 ___ 1 ____ 2 _____ 3
final reading__________ 39.5 __ 29.80 __ 19.40
initial reading ______ 19.55 __ 10.50 ___ 0.0
volume of E used _____ 19.70 ___ 19.30 __ 19.40

ii) Na2CO3(aq)^2HNO3(aq) — 2NaNO3(aq) + CO2(g) + H2O(c)
average volume of E used = 19.70+19.30+19.40/3
=19.47cm^3

(1) A student adds a known mass of magnesium ribbon to 100 cm3 of dilute hydrochloric acid (an excess) in the apparatus shown below. Hydrogen gas is evolved. The time taken to collect 48 cm3 of gas at room temperature and pressure is measured.

(a) (i) Name apparatus A.
(ii) Name apparatus B.
(b) (i) Calculate the number of moles of hydrogen in the 48 cm3 of gas.
[1 mole of any gas occupies 24 000 cm3 at room temperature and pressure.]

(ii) Use the equation below to deduce the mass of magnesium used in the experiment to produce 48 cm3 of hydrogen at room temperature and pressure. [Ar: Mg, 24]
Mg + 2HCl MgCl2 + H2
(c) Give a test for hydrogen gas.

(d) What is the effect on the time taken to collect the same volume of gas if,
(i) large lumps of the same mass of magnesium are used instead of magnesium ribbon,
(ii) the reaction is carried out at a higher temperature?

2(a) A student investigates the electrolysis of aqueous copper(II) sulfate using graphite electrodes and the apparatus shown below.

(i) What is observed at electrode R?
(ii) Construct the equation for the reaction taking place at electrode R.
(iii) When graphite electrodes are used a colour change is seen in the solution. What is this colour change? Explain why it happens.
(iv) When graphite electrodes are used, a gas is evolved at one of the electrodes. Name the gas and give a test for the gas.
(v) If the graphite electrodes are replaced with copper electrodes, no colour change is seen on the electrolysis of the solution. Explain why.

(b) The student does more experiments using the apparatus in (a) with graphite electrodes
but, in each case, using a different electrolyte.
Complete the table below.

The details of the WAEC Chemistry practical drawings and answers will be made available to you candidates as soon as it is released. Keep following this page and make sure you bookmark this site for reference purposes.

DISCLAIMER! These are not real WAEC Chemistry Practical questions but likely repeated questions over the years to help candidate understand the nature of their examinations. Ensure to take note of every questions provided on this page.

If you need us to help you with updated questions and answers at the right time about this Examination, kindly provide us your phone number and email address in the comment box below. Also, feel free to ask any questions pertaining to this guide. 

What’s your take on this? We believe this article was interesting right, if yes, don’t hesitate to use our share button below to inform – friends and relations via Facebook and Twitter. 

CSN Team