9. Hydrometallurgy is used for reduction of which of the following : (a) gold (b) copper Givr reason

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Q. Assertion :Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by more electropositive metal. Reason: Copper is extracted by hydrometallurgy.

Q. Which of the following statements is correct?
(i) Copper is extracted by hydrometallurgy from low-grade ores.
(ii) In the electrolytic reduction of alumina, graphite is acting as an anode and steel vessel with the lining of carbon acts as an anode.
(iii) In Hall-Heroult process, aluminium is obtained at anode and CO and

C O_{2}

are produced at the cathode.

Q. STATEMENT-1: Extraction of zinc from sphalerite ore involves the roasting followed by reduction with coke.
STATEMENT-2 : Zinc can be commercially extracted by hydrometallurgy.

Assertion:- An alloy of gold with copper or silver is used to make ornaments.

Reason:- Pure gold is soft due to which it cannot be not used to make ornaments.

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