cameroon gce A level June 2023 chemistry 1

cameroon gce A level June 2023 chemistry 1

cameroon gce A level June 2023 chemistry 1

Questions 1 – 36 (Thirty-six questions)
Directions: Each of the questions or incomplete
statements in this section is followed by four
suggested answers. Select the best answer in each
case.
1 . Give the name of the instrument used to
determine the structure of crystals.
A Mass spectrometer
B X-ray goniometer
C UV spectrometer
D IR spectrometer
The reaction of benzene with bromine in the
presence of iron(III) bromide is: –
A Nucleophilic substitution
B Electrophilic addition
C Rearrangement and elimination
D Electrophilic substitution
8.
2. Below are some properties of chlorine, bromine
and their compounds. Which property has a
smaller value for chlorine than bromine.
A Bond strength of hydrogen-halogen bond
^ molecules Strength ofof van theder element waals forces between
C First ionisation energy
^ ammonia Solubility of the silver halide in aqueous
9. The reaction between two species C and D was
investigated and the following data collected.
Initial
rate/ moldm-3*”1
Experiment [C] [D]
moldm 3 /moldm 3
1 0.15 0.15 1
2 0.30 0.15 4
3 0.15 0.30 2
The rate expression is given as
A Rate = k [C][D]
B Rate = k [C][D]2
C Rate = k [C]2[D]
D Rate = k [C]2[D]2
3. Given the following half equations
Cr3+(aq) + e’ ±5 Cr2+(aq) Ee = – 0.41 V
Cu2+(aq) + 2e‘ £? Cu(s) E0 = +0.34 V
Calculate the e.m.f of the cell formed when the
two half cells are coupled.
A +0.75 V
B -0.07 V
C +0.07 V
D -0.75 V
10. In the complex ion [Cr(en)2CI2]\ state the
coordination number and oxidation state of
chromium.
A 4 and + l
B 6 and +3
C 6 and + 1
D 4 and +3
4. The radioactive decay of fiNi has a half-life of
120 days. How long will it take for 1.2 g of nickel
to reduce to 0.30 g?
A 60 days
B 120 days
C 240 days
D 360 days
11 . How many lone pairs of electrons are in a
molecule of carbon monoxide (CO)?
A 1
B 2
C 3
5. Which reagent is used to distinguish between D 4
propan- l -ol and propan-2-ol?
A PCJ 5
B Thionyl chloride
C Ammoniacal silver nitrate
D ZnCI2/conc HCI
12. An element X has the following successive
ionization energies in kj mol-1
786, 1580, 3230, 4360, 16000, 20000, 23600
To which group in the Periodic Table does X
belong?
A group IV
B group III
C group II
D group V
6. Which of the terms below permits the use of +4
oxidation state by group IV elements in the
formation of compounds?
A Inert pair effect
B Catenation
C Hybridization
D Ionization