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Metals and Their Compounds

200 MCQ questions with answers and explanations · page 3 of 8

Test yourself▶ 25 question test▶ 50 question test

Q51. Cryolite is added in the electrolysis of alumina because

  1. Ato increase electrical conductivity
  2. BTo reduce the carbon content of alumina
  3. CTo reduce the anode effect
  4. DTo separate impurities from alumina
Show answer & explanation

Answer: B) To reduce the carbon content of alumina

Q52. Which of the following salts is found in the highest quantity in human bones?

  1. Amagnesium chloride
  2. Bcalcium carbonate
  3. Ccalcium phosphate
  4. Dsodium chloride
Show answer & explanation

Answer: C) calcium phosphate

Q53. Calcium fluoride is added to calcium chloride in the extraction of calcium metal because

  1. Ait lowers the melting point
  2. Bit acts as a desiccant
  3. CIt acts as an oxidizer
  4. DMakes calcium chloride an electrolyte.
Show answer & explanation

Answer: A) it lowers the melting point

Q54. The chemical formula of Plaster of Paris is

  1. ACaSO⁴ 5H²O
  2. B2CaSO⁴ H²O
  3. C(CaSO⁴)² 2H ²O
  4. DCaSO⁴MgO
Show answer & explanation

Answer: B) 2CaSO⁴ H²O

Q55. Which one of the following is the chemical formula of gypsum, a constituent of cement?

  1. ACa²SiO⁴
  2. BCaSO⁴ 2H ²O
  3. CCaO
  4. DCaSO⁴ 3H ²O
Show answer & explanation

Answer: B) CaSO⁴ 2H ²O

Q56. 'Chalk' and 'marble' are different forms of which of the following?

  1. ACalcium Hydrogen Carbonate
  2. Bcalcium carbonate
  3. CCalcium Acetate
  4. Dsodium carbonate
Show answer & explanation

Answer: B) calcium carbonate

Q57. Which of the following is the primary constituent of 'pearl'?

  1. Acalcium sulfate
  2. Bcalcium carbonate
  3. Cpotassium sulphate
  4. Dcalcium peroxide
Show answer & explanation

Answer: B) calcium carbonate

Q58. The chemical formula of quick lime is

  1. ACaO
  2. BCa(OH)²
  3. CCaCO³
  4. DCaCl²
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Answer: A) CaO

Q59. Which of the following is 'marble'?

  1. ACaCO³
  2. BCaSO⁴
  3. CMgCO³
  4. DCaHCO³
Show answer & explanation

Answer: A) CaCO³

Q60. Bleaching powder is

  1. ACaOCI
  2. BCaOCl²
  3. CCaOCl³
  4. DCaOC⁴
Show answer & explanation

Answer: B) CaOCl²

Q61. Dolomite is the ore of which of the following metals?

  1. Astrontium
  2. Bpotassium
  3. Caluminum
  4. DCalcium
Show answer & explanation

Answer: D) Calcium

Q62. What is the chemical name of quicklime?

  1. Acalcium chloride
  2. Bcalcium oxide
  3. Ccalcium hydroxide
  4. Dcalcium carbonate
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Answer: B) calcium oxide

Q63. The reaction of quicklime (CaO) with water to form slaked lime (Ca(OH)²) is an example of what?

  1. Adisplacement reaction
  2. Bendothermic reaction
  3. Cdecomposition reaction
  4. Dexothermic reaction
Show answer & explanation

Answer: D) exothermic reaction

Q64. What is used as bandages in surgery?

  1. Acalcium sulphate
  2. Bcalcium chloride
  3. Caluminum sulfate
  4. Dcalcium phosphate
Show answer & explanation

Answer: A) calcium sulphate

Q65. The chemical name of plaster of Paris is

  1. Acalcium chloride
  2. BCalcium Nitrate
  3. CCalcium Sulfate Hydrate
  4. Dnone of these
Show answer & explanation

Answer: C) Calcium Sulfate Hydrate

Q66. Plaster of Paris is made of

  1. Amarble
  2. Bcement
  3. CGypsum
  4. Dlimestone
Show answer & explanation

Answer: C) Gypsum

Q67. The chemical name of bleaching powder is

  1. Acalcium oxychloride
  2. Bsodium bicarbonate
  3. Ccalcium hydroxide
  4. Dcalcium carbonate
Show answer & explanation

Answer: A) calcium oxychloride

Q68. The popular name of calcium sulphate used by doctors, painters, craftsmen etc. is

  1. Alime of soda
  2. Bpotassium permanganate
  3. CGypsum
  4. Dplaster of Paris
Show answer & explanation

Answer: D) plaster of Paris

Q69. What is asbestos made of?

  1. Acalcium and magnesium
  2. Bcopper, zinc and manganese
  3. CLead and iron
  4. DCalcium and Zinc
Show answer & explanation

Answer: A) calcium and magnesium

Q70. Bleaching powder is prepared by passing through which of the following?

  1. Achlorine from slaked lime
  2. Boxygen from slaked lime
  3. CCO² from the touch of extinguished
  4. Dchlorine from quicklime
Show answer & explanation

Answer: A) chlorine from slaked lime

Q71. The 'Heinzclever method' is the commercial method of production of?

  1. Acaustic soda
  2. Bnitric acid
  3. CSulphuric end
  4. Dbleaching powder
Show answer & explanation

Answer: D) bleaching powder

Q72. Which statement is false for 'bleaching powder'?

  1. AIt is more soluble in water
  2. BIt is a light yellow powder
  3. CIt is an oxidizing agent.
  4. DIt releases chlorine when reacted with dilute acids.
Show answer & explanation

Answer: A) It is more soluble in water

Q73. Leaving bleaching powder open for a long time reduces its activity. Why does this happen?

  1. Areacts with CO² to release CI²
  2. Breacts with CO² to release O²
  3. Creacts with CO² to release CH⁴
  4. Dnone of these
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Answer: A) reacts with CO² to release CI²

Q74. Which of the following statements is correct about bleaching powder and DDT?

  1. ABoth are inorganic compounds. Both contain chlorine compounds.
  2. BBoth are organic compounds
  3. CBoth contain chlorine compounds.
  4. DBoth contain calcium compounds.
Show answer & explanation

Answer: C) Both contain chlorine compounds.

Q75. Which of the following is not an ore of iron?

  1. ACuprite
  2. BHematite
  3. CMagnetite
  4. DSiderite
Show answer & explanation

Answer: A) Cuprite

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