Kuiz Kimia Tingkatan 5 Bab 1 Set 3

SELAMAT DATANG Kuiz Kimia Tingkatan 5 Bab 1 Set 3

KUIZ INI MENGANDUNGI 10 SOALAN

In the electrolysis of a DILUTE aqueous solution of copper(II) chloride (CuCl2) using inert electrodes, what is produced at the anode?

Hydrogen gas

Chlorine gas

Copper metal

Oxygen gas

None

Why is cryolite (Na3AlF6) added to aluminum oxide (Al2O3) during the industrial extraction of aluminum?

To lower the melting point of aluminum oxide.

To increase the reactivity of aluminum

To prevent the carbon anodes from oxidizing

To act as the main electrolyte for the process.

None

The process of purifying impure copper via electrolysis involves setting up a cell. How are the electrodes and electrolyte arranged?

Anode: Carbon; Cathode: Impure copper; Electrolyte: CuSO4(ak)

Anode: Impure copper; Cathode: Pure copper; Electrolyte: NaCl(ak)

Anode: Pure copper; Cathode: Impure copper; Electrolyte: CuSO4(ak)

Anode: Impure copper; Cathode: Pure copper; Electrolyte: CuSO4(ak)

None

In the context of rusting, sacrificial protection involves connecting iron to another metal. For this to work, the other metal must be:

more electropositive (more reactive) than iron

a very good electrical insulator

less electropositive (less reactive) than iron.

the same electropositivity as iron.

None

What is the primary function of a salt bridge in a Daniell cell?

To mix the two electrolyte solutions

To act as the site of oxidation or reduction

To allow electrons to flow between the two half-cells

To allow ions to flow between the half-cells to maintain electrical neutrality.

None

Which of the following defines an oxidation reaction in terms of hydrogen transfer?

A substance loses electrons

A substance gains hydrogen.

A substance loses hydrogen

A substance gains oxygen.

None

Which of these halogens is the strongest oxidizing agent?

Iodine (I2)

Astatine (At2)

Bromine (Br2)

Chlorine (Cl2)

None

What is the correct IUPAC name for the compound Cu2O?

Copper oxide

Dicopper monoxide

Copper(II) oxide

Copper(I) oxide

None

In the reaction Zn(p)+CuSO4(ak)→ZnSO4(ak)+ Cu(p), what is the role of the zinc metal, Zn?

It is the substance that is reduced

It is a spectator ion.

It is the reducing agent.

It is the oxidizing agent.

None

10.

If you want to electroplate a steel key with silver, which of the following setups is correct?

The key is the cathode, a silver bar is the anode, and the electrolyte is sodium chloride.

The key is the anode, a carbon rod is the cathode, and the electrolyte is silver nitrate.

The key is the anode, a silver bar is the cathode, and the electrolyte is silver nitrate.

The key is the cathode, a silver bar is the anode, and the electrolyte is silver nitrate.

None

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