Aluminium, Iron, Copper and Zinc are extracted from
- A.Bauxite, Magnetite, Malachite and Calamine respectively
- B.Magnetite, Bauxite, Malachite and Calamine respectively
- C.Calamine, Malachite, Magnetite and Bauxite respectively
- D.Malachite, Magnetite, Bauxite and Calamine respectively
Correct answer
Explanation
The correct answer is A, Bauxite, Magnetite, Malachite and Calamine respectively. Each metal here is paired with one of its best-known ores. Bauxite is hydrated aluminium oxide; alumina is refined from it and then broken down by electrolysis in the Hall-Héroult process. Magnetite (Fe3O4) is the magnetic ore of iron, while haematite (Fe2O3) is India's chief iron ore. Malachite is a green basic copper carbonate, though copper pyrites is the main commercial ore of copper. Calamine is zinc carbonate (ZnCO3), and zinc blende (ZnS) is the other main ore of zinc; the Zawar mines of Rajasthan are famous for it. Option B is wrong because it gives aluminium to magnetite and iron to bauxite. Option C is wrong because it runs the list backwards, pairing aluminium with calamine and zinc with bauxite. Option D is wrong because malachite is an ore of copper, not aluminium, and bauxite is not an ore of copper. Exam tip: "B-M-M-C" in order: Bauxite-Al, Magnetite-Fe, Malachite-Cu, Calamine-Zn.
Practice Questions
View allThe fact that the planets move around the Sun, not in circles but in ellipses, was first demonstrated by
- A.Galileo
- B.Martin Luther
- C.Johannes Kepler
- D.Copernicus
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In 1609 Kepler showed that the planets move around the Sun in elliptical orbits, with the Sun at one focus of the ellipse.
Read the full explanation →Which one of the following statements is correct?
- A.Urea is produced in liver.
- B.Urea is produced in blood.
- C.Urea is produced from digestion of starch.
- D.Urea is produced in lung and kidney.
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Liver cells turn the toxic ammonia released from the breakdown of amino acids into urea through the ornithine cycle, also called the urea cycle.
Read the full explanation →Which one of the following is the correct sequence of passage of light in a compound microscope?
- A.Condenser-Objective lens-Eyepiece-Body tube
- B.Objective lens-Condenser-Body tube-Eyepiece
- C.Condenser-Objective lens-Body tube-Eyepiece
- D.Eyepiece-Objective lens-Body tube-Mirror
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Light passes through the condenser to the specimen, is picked up by the objective lens, travels up the body tube and reaches the eye through the eyepiece.
Read the full explanation →Which one of the following statements regarding haemoglobin is correct?
- A.Haemoglobin present in RBC can carry only oxygen but not carbon dioxide.
- B.Haemoglobin of RBC can carry both oxygen and carbon dioxide.
- C.Haemoglobin of RBC can carry only carbon dioxide.
- D.Haemoglobin is only used for blood clotting and not for carrying gases.
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It binds oxygen at its iron-containing haem groups and carries some carbon dioxide on its protein chains. Each haemoglobin molecule has four polypeptide chains and four haem groups, and each haem iron can hold one oxygen molecule, forming oxyhaemoglobin in the lungs.
Read the full explanation →Which one of the following statements regarding histone proteins is correct?
- A.Histones are proteins that are present in mitochondrial membrane.
- B.Histones are proteins that are present in nucleus in association with DNA.
- C.Histones are proteins associated with lipids in the cytosol.
- D.Histones are proteins associated with carbohydrates in the cytosol.
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They are the proteins around which DNA winds to form chromatin in the nucleus of eukaryotic cells. Histones are small basic proteins, rich in the positively charged amino acids lysine and arginine, which attract the negatively charged phosphate groups of DNA.
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