In the extraction of copper from copper pyrites, the ore is first concentrated by: MCQ with Answer and Explanation

In the extraction of copper from copper pyrites, the ore is first concentrated by:
A. Magnetic separation
B. Calcination
C. Froth flotation
D. Leaching
Answer: Option C
Solution (By JKExamLibrary)
Copper pyrites (CuFeS₂) is a sulfide ore, concentrated by froth flotation using pine oil and water. Then roasting, smelting, and refining.

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More chemistry Questions

Question #1
Which of the following reactions is an example of a Wurtz reaction?
A. CH3Cl + KOH(aq) -> CH3OH + KCl
B. 2CH3Cl + Zn -> C2H6 + ZnCl2
C. CH3Cl + KOH(alc) -> CH4 + KCl
D. CH3Cl + Na -> C2H6 + NaCl

Correct Answer: Option D


Explanation:
The Wurtz reaction involves the reaction of an alkyl halide with sodium metal in dry ether to form a higher alkane. For example, two molecules of methyl chloride react with two sodium atoms to form ethane (C2H6) and sodium chloride. It is primarily used to synthesize symmetrical alkanes with an even number of carbon atoms.

This question belongs to: Science chemistry
Question #2
The process of converting vegetable oils to solid fats (vanaspati) involves:
A. Saponification
B. Hydrogenation
C. Esterification
D. Fermentation

Correct Answer: Option B


Explanation:
Hydrogenation adds hydrogen to unsaturated vegetable oils in the presence of nickel catalyst at about 150°C, converting liquid oils (C=C bonds) to solid fats (vanaspati ghee) with higher melting points. Saponification makes soap. Esterification forms esters. Fermentation produces alcohol. Partial hydrogenation can produce trans fats, which are harmful. Complete hydrogenation yields saturated fats.

This question belongs to: Science chemistry
Question #3
Which acid is known as 'Aqua Fortis'?
A. Sulfuric acid
B. Acetic acid
C. Hydrochloric acid
D. Nitric acid

Correct Answer: Option D


Explanation:
Nitric acid (HNO3) is historically known as Aqua Fortis, which translates to 'strong water' in Latin. This name was given by early alchemists due to its ability to dissolve almost all metals, including silver, which was not dissolved by other known acids at the time.

This question belongs to: Science chemistry