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SPM Chemistry A xplosive Module (Chemistry A Ticket For “U”) RED ZONE [RZ]

39 Diagram 11 shows the set up of apparatus to investigate electrochemical corrosion on
iron
Rajah 11 menunjukan susunan radas untuk mengkaji pengaratan besi secara
Elektrokimia

Iron nail [Paku besi]
Jelly + Potassium hexacyanoferrate
(III)
Agar-agar + kalium
X metal
Logam X

Diagram 11 / Rajah 11

Which of the following metals is suitable as metal X to speed up the electrochemical
corrosion process of the iron nail?
Antara yang berikut logam yang paling sesuai sebagai X untuk mempercepatkan proses
pengaratan paku besi secara elekrokimia?

A Zinc C Aluminium
Zink Aluminium

B Copper D Magnesium
kuprum Magnesium

40 What is the oxidation number of copper in copper(II) sulphate, CuSO 4?
Apakah nombor pengoksidanan kuprum dalam kuprum(II) sulfat, CuSO 4?

A +1 C +3
B +2 D +4

41 Table 5 shows the potential differences of three simple voltaic cells.
Jadual 5 menunjukkan nilai beza keupayaan bagi tiga sel voltan ringkas

Metal pair Negative terminal Voltage (V)
Pasangan logam Terminal negatif Voltan (V)

Mg - Fe Mg 4.5
Pb - Cu Pb 0.3
Fe - Pb Fe 0.8
Mg - Cu Mg

Table 5 / Jadual 5

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