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IGCSE Chemistry Extended4.1.4—Metals or hydrogen are formed at theTopic Practice

4.1.4—Metals or hydrogen are formed at the

• State: metals or hydrogen are formed at the cathode and that non-metals (other than hydrogen) are formed at the anode

Question 10

[Maximum number: 1]

The diagram shows the electrolysis of concentrated hydrochloric acid and concentrated aqueous sodium chloride using carbon electrodes.

Question image
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At which electrodes is hydrogen produced?

A

electrode 1 only

B

electrodes 1 and 3

C

electrode 2 only

D

electrodes 2 and 4

Question 4(e)(iv)

[Maximum number: 1]

Hydrogen can be manufactured from methane by steam reforming.

CH4( g)+H2O( g)⇌CO( g)+3H2( g)\mathrm{CH}_{4}(\mathrm{~g})+\mathrm{H}_{2} \mathrm{O}(\mathrm{~g}) \rightleftharpoons \mathrm{CO}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g})

The reaction is carried out using a nickel catalyst at temperatures between 700∘C700^{\circ} \mathrm{C} and 1100∘C1100^{\circ} \mathrm{C} and using a pressure of one atmosphere.

The forward reaction is endothermic.

Hydrogen can also be manufactured by electrolysis. The electrolyte is concentrated aqueous sodium chloride. The electrodes are inert.

The products of electrolysis are hydrogen, chlorine and sodium hydroxide.

Where is hydrogen produced in the electrolytic cell?

Question 5(e)(i)

[Maximum number: 1]

Titanium is extracted from an ore called rutile. Rutile is an impure form of titanium(IV) oxide, TiO2\mathrm{TiO}_{2}.

Magnesium cannot be produced by electrolysis of aqueous magnesium chloride using inert electrodes.

Name the product formed at the negative electrode (cathode) during the electrolysis of aqueous magnesium chloride.

Question 7(f)(ii)

[Maximum number: 1]

Copper is refined (purified) by electrolysis. Nickel can be refined using a similar method.

Indicate, by writing N on the diagram, where nickel is produced.

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