Explanation: Copper is usually never found in a natural state. Copper is found in several ores across the world including sulfide ore which contains 0.5 – 2% of copper. It has to undergo several processes to attain purity.

Explanation: Crushing is one of the first things done in the extraction process of copper from its ore. Copper ore is crushed to a particular required size. Crushing is done to separate the particles to make it easier to obtain the pure material.

Explanation: The extraction of copper from its ores is done through several techniques that include roasting, refining, smelting, crushing etc. Dow’s process is done to obtain the substance magnesium, not copper.

Explanation: Copper is found in several ores. Some of the ores are chalcocite, cuprite, bornite, chalcopyrite etc. Magnesite and dolomite are not ores of copper, they are ores of the element magnesium.

Explanation: Sulfide ores are usually processed through the technique known as pyrometallurgy. Pyrometallurgy involves several processes like froth flotation, thickening, smelting, electrolysis etc.

Explanation: Copper is found in ores in the earth’s crust. Copper oxides are found in considerable amounts but do not have a high concentration. Typically, all copper ores contain less than 1% of copper.

Explanation: The above statement is correct. Oxide ores are typically processed using hydrometallurgy. Hydrometallurgy involves using water-based solutions to purify copper. This technique contains processes like solvent extraction etc.

Explanation: Smelting is done to eradicate unwanted materials like sulfur and gangue minerals to the fullest extent possible. The output of the smelting phase is called copper matte. It is a combination of sulfur, copper and iron.

Explanation: The amount of copper found in ores is different for different ores. There are also sulfide ores and oxide ores of copper. But, at the end of the extraction process, the copper obtained has a purity of around 99.9%.

Explanation: The above statement is incorrect. It is possible to recycle used copper goods by melting them and once again purifying them. The product that is obtained through this process can be used in making new commodities.