Which of the following is an ore of aluminum? MCQ with Answer and Explanation

Which of the following is an ore of aluminum?
A. Bauxite
B. Haematite
C. Galena
D. Cinnabar
Answer: Option A
Solution (By JKExamLibrary)
Bauxite (Al₂O₃·2H₂O) is the primary ore of aluminum. Haematite (Fe₂O₃) is an ore of iron. Cinnabar (HgS) is an ore of mercury, and Galena (PbS) is an ore of lead. Bauxite is purified to alumina before being electrolyzed to extract pure aluminum metal.

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Practice More chemistry Questions

Question #1
Which fertilizer contains the highest percentage of nitrogen?
A. Urea
B. Ammonium sulfate
C. Sodium nitrate
D. DAP

Correct Answer: Option A


Explanation:
Urea (NH₂CONH₂) contains about 46% N. Ammonium sulfate ~21% N, sodium nitrate ~16% N, DAP ~18% N (and 46% P₂O₅). Urea is the most concentrated solid nitrogen fertilizer.

This question belongs to: Science chemistry
Question #2
The process in which a heavy nucleus splits into two lighter nuclei with the release of enormous energy is called:
A. Transmutation
B. Nuclear fission
C. Radioactive decay
D. Nuclear fusion

Correct Answer: Option B


Explanation:
Nuclear fission is a reaction in which the nucleus of a heavy atom (like Uranium-235 or Plutonium-239) splits into two or smaller, lighter nuclei when bombarded by a neutron, releasing a massive amount of energy and more neutrons, potentially causing a chain reaction.

This question belongs to: Science chemistry
Question #3
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 + Na -> C2H6 + NaCl
D. CH3Cl + KOH(alc) -> CH4 + KCl

Correct Answer: Option C


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