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

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.

Q.

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.

Q.

Given below are some statements contrasting Hydrometallurgy and pyrometallurgy. Which of the following are the advantages of Hydrometallurgy (leaching)?