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MODULE • Chemistry Form 4

Objective Questions / Soalan Objektif

1 Which of the following is an electrolyte? C Copper electrode becomes Copper electrode becomes
Antara berikut, yang manakah adalah elektrolit? thicker thinner
A Glacial ethanoic acid Elektrod kuprum semakin tebal Elektrod kuprum semakin nipis
Asid etanoik glasial D Gas bubbles are released Copper electrode becomes
B Molten naphthalene Gelembung gas dibebaskan thicker
Naftalena lebur Elektrod kuprum semakin tebal
C Aqueous solution of zinc chloride
Larutan akueus zink klorida 4 The diagram below shows the set-up of apparatus of an
D Hydrogen chloride in methylbenzene electrolysis process.
Hidrogen klorida dalam metilbenzena Rajah di bawah menunjukkan sususnan radas untuk proses elektrolisis.

2 The diagram below shows the set-up of apparatus used
to electrolyse substance X. Electrolyte
Rajah di bawah menunjukkan susunan radas untuk elektrolisis Elektrolit
bahan X.
Carbon electrode P Q Carbon electrode
Elektrod karbon Elektrod karbon

Carbon electrodes
Elektrod karbon
Which of the following electrolytes produce oxygen gas at
electrode Q?
Substance X Antara elektrolit berikut, yang manakah membebaskan gas oksigen pada
Bahan X elektrod Q?
I 1.0 mol dm hydrochloric acid
–3
Heat Asid hidroklorik 1.0 mol dm
–3
Panaskan II 1.0 mol dm sulphuric acid
–3
Asid sulfurik 1.0 mol dm –3
Which of the following compounds can light up the bulb III 1.0 mol dm potassium iodide solution
–3
when used as substance X? Larutan kalium iodida 1.0 mol dm
–3
Antara berikut, yang manakah boleh menyalakan mentol apabila IV 1.0 mol dm nitric acid
–3
digunakan sebagai bahan X? Asid nitrik 1.0 mol dm –3
A Copper(II) nitrate / Kuprum(II) nitrat A I and II only / I dan II sahaja
B Lead(II) iodide / Plumbum(II) iodida B II and III only / II dan III sahaja
C Zinc carbonate / Zink karbonat C II and IV only / II dan IV sahaja
D Sodium carbonate / Natrium karbonat D II, III and IV only / II, III dan IV sahaja
3 The diagram below shows the set-up of apparatus for 5 The table below shows the observation of electrolysis of a
electrolysis of copper(II) sulphate solution. substance Q using carbon electrode.
Rajah di bawah menunjukkan susunan radas untuk elektrolisis larutan Jadual di bawah menunjukkan pemerhatian bagi elektrolisis bahan Q
kuprum(II) sulfat. menggunakan elektrod karbon.
Electrode Observation
Elektrod Pemerhatian
Anode A greenish-yellow gas released
Copper Copper electrode Y Anod Gas kuning kehijauan terbebas
electrode X Elektrod kuprum Y Cathode A colorless gas which burns with a ‘pop’
Elektrod Copper(II) Katod sound is released
kuprum X sulphate solution Gas tanpa warna terbakar dengan bunyi ‘pop’
Larutan kuprum(II) dibebaskan
sulfat
What can be observed at the electrodes X and Y after What is substance Q?
30 minutes? Apakah bahan Q?
–3
Apakah yang dapat diperhatikan pada elektrod X dan Y selepas 30 A 1.0 mol dm of hydrochloric acid.
–3
minit? Asid hidroklorik 1.0 mol dm .
B 1.0 mol dm of potassium nitrate solution.
–3
X Y Larutan natrium nitrat 1.0 mol dm .
–3
–3
A Copper electrode becomes Copper electrode becomes C 1.0 mol dm of copper(II) chloride solution.
–3
thinner thicker Larutan kuprum(II) klorida 1.0 mol dm .
–3
Elektrod kuprum semakin nipis Elektrod kuprum semakin tebal D 1.0 mol dm of magnesium bromide solution.
Larutan magnesium bromida 1.0 mol dm .
–3
B Copper electrode becomes Gas bubbles are released
thinner Gelembung gas dibebaskan
Elektrod kuprum semakin nipis
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