Check WAEC GCE Chemistry Practical Repeated Questions 2017

Check WAEC GCE Chemistry Practical Repeated Questions 2017

Check WAEC GCE Chemistry Practical Repeated Questions 2017

 

Check WAEC GCE Chemistry Practical Repeated QuestionsCheck WAEC GCE Chemistry Practical Repeated Questions 2017

Check WAEC GCE Chemistry Practical Repeated Questions:….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.

Check WAEC GCE Chemistry Practical Repeated Questions 2017

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 gelatineous 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

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