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Metals and Their Compounds

200 MCQ questions with answers and explanations · page 2 of 8

Test yourself▶ 25 question test▶ 50 question test

Q26. Sodium carbonate is commonly known as

  1. Abaking soda
  2. BWashing soda (washing soda)
  3. CCaustic Soda
  4. DCaustic potash
Show answer & explanation

Answer: B) Washing soda (washing soda)

Q27. Table salt becomes wet during the rainy season because

  1. ASodium chloride is a hygroscopic
  2. BSodium chloride is a diffusible substance
  3. CSodium chloride contains some amount of sodium iodide.
  4. DSodium chloride contains adhesive impurities like MgCI².
Show answer & explanation

Answer: D) Sodium chloride contains adhesive impurities like MgCI².

Q28. Iodized salt contains—

  1. Afree iodine
  2. BCalcium Iodide
  3. CMagnesium Iodide
  4. Dpotassium iodide
Show answer & explanation

Answer: D) potassium iodide

Q29. Common salt (NaCl) is not used as a raw material for the preparation of which of the following compounds?

  1. Ableaching powder
  2. Bbaking soda
  3. Cplaster of paris
  4. Dwashing soda
Show answer & explanation

Answer: C) plaster of paris

Q30. The chemical substance used as a fixative in photography is

  1. Asodium thiosulfate
  2. Bammonium molybdate
  3. Csodium tetrathionate
  4. DBorax
Show answer & explanation

Answer: A) sodium thiosulfate

Q31. With which substance is human blood mixed and stored in blood cells?

  1. Asodium nitrate and dextrate
  2. Bsodium and oxygen
  3. Coxygen and chlorine
  4. Dpotassium and calcium chloride
Show answer & explanation

Answer: A) sodium nitrate and dextrate

Q32. Magnesium metal is mainly extracted from which ore?

  1. AMagnesite
  2. BDolomite
  3. CCarnallite
  4. DKiemerite
Show answer & explanation

Answer: C) Carnallite

Q33. Which of the following metals burns in nitrogen?

  1. Asodium
  2. BCalcium
  3. CMagnesium
  4. DPlatinum
Show answer & explanation

Answer: C) Magnesium

Q34. What is the main ingredient of the antacid being marketed as milk of magnesia?

  1. AMgCl²
  2. BMgCO³
  3. CMg(OH)²
  4. DMgSO⁴
Show answer & explanation

Answer: C) Mg(OH)²

Q35. Which of the following is present in chlorophyll molecule?

  1. AMn
  2. BMg
  3. CFe
  4. DK
Show answer & explanation

Answer: B) Mg

Q36. The chemical formula of Epsom Salt is

  1. AZnSO⁴7H²O
  2. BNa²S0⁴ 10H²O
  3. CNa²CO³ 10H²O
  4. DMgSO⁴7H²O
Show answer & explanation

Answer: D) MgSO⁴7H²O

Q37. The base used as an ant acid is-

  1. Acalcium hydroxide
  2. BVarium Hydroxide
  3. Cmagnesium hydroxide
  4. Dsilver hydroxide
Show answer & explanation

Answer: C) magnesium hydroxide

Q38. Which aluminum salt is commonly used to stop bleeding?

  1. Aannium chloride
  2. Baluminum nitrate
  3. CAmmonium Sulphate
  4. DPotash alum
Show answer & explanation

Answer: D) Potash alum

Q39. Which of the following compounds is used in making fireproof cloth?

  1. Asodium sulphate
  2. BMagnesium Sulfate
  3. Caluminum sulfate
  4. Dferrous sulfate
Show answer & explanation

Answer: C) aluminum sulfate

Q40. Bauxite ore is—

  1. Aof iron
  2. Bof aluminum
  3. Ccopper
  4. DOf gold
Show answer & explanation

Answer: B) of aluminum

Q41. Aluminium metal is extracted from bauxite by—

  1. Aby fractional distillation
  2. Bby electrolysis
  3. Cby sublimation
  4. Dchromatographically
Show answer & explanation

Answer: B) by electrolysis

Q42. Which of the following metals is most abundant in the Earth's crust?

  1. Aaluminum
  2. BIron
  3. CMagnesium
  4. Dsodium
Show answer & explanation

Answer: A) aluminum

Q43. Although the amount of aluminium in the earth's crust is greater than that of iron, yet aluminium is more expensive than iron because

  1. AAluminum is more commonly used than iron.
  2. BAluminum forms more alloys than iron.
  3. CThe demand for aluminum appliances is higher than that of iron appliances.
  4. DMetallic methods of producing aluminum are more expensive than those for iron.
Show answer & explanation

Answer: D) Metallic methods of producing aluminum are more expensive than those for iron.

Q44. Aluminium is obtained by electrolysis of pure Al2O3 dissolved in

  1. ABauxite
  2. BCryolite
  3. Cfeldspar
  4. DAlumina
Show answer & explanation

Answer: B) Cryolite

Q45. Which of the following statements regarding aluminium is not correct?

  1. AAluminum hydroxide is amphoteric in nature.
  2. BAluminum exists in the free state in nature.
  3. CThe demand for aluminum appliances is higher than that of iron appliances.
  4. DMetallic methods of producing aluminum are more expensive than those for iron.
Show answer & explanation

Answer: B) Aluminum exists in the free state in nature.

Q46. Which metal is protected by its own oxide?

  1. AIron
  2. Bsilver
  3. CSleep
  4. Daluminum
Show answer & explanation

Answer: D) aluminum

Q47. Which metal is used to make airplanes and rockets?

  1. ALimit
  2. Baluminum
  3. COut
  4. DCopper
Show answer & explanation

Answer: B) aluminum

Q48. Common alum is

  1. AK²SO⁴ AL²(SO)⁴ 24H²O
  2. BK²SO⁴ Al,² SO³)⁴ 21H²O
  3. CK²SO⁴ AL²(SO⁴) ³18H²0
  4. DK²SO⁴ Fe ²(90⁴)³ 24H²0
Show answer & explanation

Answer: A) K²SO⁴ AL²(SO)⁴ 24H²O

Q49. The chemical name of bauxite is

  1. Aaluminum oxide
  2. BAluminum chloride
  3. CAmmonium Sulphate
  4. DHydrated Alumina
Show answer & explanation

Answer: D) Hydrated Alumina

Q50. Potash alum is useful in water purification because it

  1. Akills microbes
  2. BIt removes the hardness of water
  3. CIt precipitates colloidal solutions
  4. DIt keeps the water soft
Show answer & explanation

Answer: C) It precipitates colloidal solutions

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