At a site low grade copper ores are available, and zinc and iron scraps are also available. Which of the two scraps would be more suitable for reducing the leached copper ore and why?

Q. Which reducing agent is employed to get copper from the leached low grade copper ore?

Q. $S_1:$ In electrolytic refining, the impurities from the blister copper deposits anode mud which contains antimony, selenium, tellurium, silver, gold and platinum. (from copper pyrites)
$S_2:$ The low grade ore of copper is leached with acid and is then treated with scrap iron or $H_2$ to get copper.
$S_3:$ Siderite, curpite and argentite are oxide ores.
$S_4:$ Zone refining is very useful for producing semiconductor and other metals of very high purity, e.g., germanium, silicon, boron, gallium and indium.
Which of the following option is correct.
(T: True, F: False)

Q. Assertion :Copper sulfate can also be produced by slowly leaching low grade copper ore in air. Reason: Bacteria may be used to hasten the process.

Q.

How is leaching carried out in case of low grade copper ores?

Q. What is the process of leaching in case of low grade copper ores?