cameroon gce O level June 2024 chemistry 2
cameroon gce O level June 2024 chemistry 2
SECTION B
ANSWER ALL 2 questions in this section
6. A student was provided with three salts, X, Y and Z alongside with some laboratory equipment and the following
reagents; Aqueous sodium hydroxide, (NaOH(nq)), Aqueous Barium chloride, (BaCI 2(aq )), Dilute HCI(aq )
A series of tests were carried out as shown on the following table.
Study and complete the table.
TEST PROCEDURE OBSERVATION CONCLUSION
i) To 2cm * of solution X is added
5drops of NaOH(aq) and warmed
A colourless pungent gas is
evolved that turns damp red
litmus paper blue.
a.
(2 marks)
ii) A sample of X is strongly
heated in a test tube
A brown gas is evolved.
(2 marks)
i) To 2cmv of a solution of Y, is
added 2 drops of NaOH(;iq )
b. Fe’+ ions present ( 1 mark)
ii) To 2cm3 of a solution of Y, is
added 2drops of BaCI2(aq) followed
bydil HCI
SO;,2′ ions present (2 marks)
Z gives a brick red flame
colour
c. i) (3 marks)
ii) To 2cm * of a solution of Z,is
added 5drops of dil HCI without
heating
A gas is evolved which turns
lime water milky.
(2 marks)
SECTION C
ANSWER 2 QUESTIONS OUT OF 3. If you attempt more than 2 questions, only the first two will he
considered. Where appropriate, equations and diagrams should be used to illustrate your answer. Write your
answers on the sheets that follow Section C
8. a) List four factors which affect the rate of chemical reactions.
b) Using a suitable chemical reaction for each factor, describe how the factor affects the rate of the
chemical reactions.
(4, 16 marks)
9. a) Describe the extraction of Aluminium from a named ore.
b) State two uses of Aluminium, relating each use to its property.
(16, 4 marks)
Write short notes on each of the following equations. Your notes should include reaction type and
observations.
a) KBr2(aq ) + Cl2(g) —
b) CuO(S) + H2(g) —
c) CH2= CH2(g) + H2(g)
d) CH3CH2OH(aq) + CH3COOH(aq) ^ CH3COOCH2CH3(aq ) + H20(l)
10.
> 2K.C1(aq) + Br2(aq)
^ Cu(S) + H20(i)
>
,
CH3CH3(g)
