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Free Reactions of Group II Elements MCQs with Answers

56 Reactions of Group II Elements MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.

Group II reactions cover the behaviour of beryllium, magnesium, calcium, strontium and barium with water, oxygen, halogens, acids and nitrogen. The trends in reactivity, hydroxide solubility and basicity, along with the thermal decomposition of carbonates and nitrates, depend on increasing atomic size down the group.

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56 questions · page 3 of 3

41. The solubility of alkaline earth metal:

  • A. Decreases down the group
  • B. Increases down the group
  • C. Remains constant throughout the group
  • D. First increases then decreases down the group

Explanation: The solubility of the carbonates and the sulfates decreases rapidly down the group because hydration energies decrease with increasing…

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Correct answer: Increases down the group

42. The general name of ore CaSO4.2H2O is:

  • A. Gypsum
  • B. Dolomite
  • C. Calcite
  • D. Plaster of Paris

Explanation: Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4.2H2O. Thus, option A is correct.

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Correct answer: Gypsum

43. Magnesium reacts with hydrogen at high pressure in the presence of catalyst _ forming magnesium hydride.

  • A. Dolomite.
  • B. Mgl2
  • C. Mg3N2
  • D. Epsom salt

Explanation: In 1951 preparation from the elements was first reported involving direct hydrogenation of Mg metal at high pressure and temperature (200…

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Correct answer: Mgl2

44. Which of the following does not react with water?

  • A. Li
  • B. Na
  • C. Mg
  • D. Be

Explanation: d) Be (Beryllium): This is the correct option. Beryllium does not react with water.

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Correct answer: Be

45. CaO forms fertilize slag by reacting with:

  • A. P2O5
  • B. Fe2O3
  • C. Silica
  • D. FO

Explanation: a) P2O5 (Phosphorus Pentoxide): This is the correct option. Calcium oxide (CaO) reacts with phosphorus pentoxide (P2O5) to form calcium…

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Correct answer: P2O5

46. Which metal occurs as skeletal material in egg shells?

  • A. Calcium
  • B. Barium
  • C. Beryllium
  • D. Strontium

Explanation: Explanation:Calcium is found in egg shells, sea shells, teeth, and bones.

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Correct answer: Calcium

47. At which condition are hydrides of alkaline earth metals formed:

  • A. At high pressure
  • B. At room temperature
  • C. At high temperature
  • D. None of the above

Explanation: Explanation:Molten alkaline earth metal reacts with hydrogen at high pressure and in presence of catalyst forming hydrides.

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Correct answer: At high pressure

48. Asbestos is hydrated _ magnesium silicate.

  • A. Calcium
  • B. Aluminium
  • C. Barium
  • D. Iron

Explanation: Explanation:The correct answer is calcium because asbestos is a term used to describe a group of six naturally occurring fibrous minerals…

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Correct answer: Iron

49. Down the group acid-base behaviour of metallic oxides of group 2 elements changes to:

  • A. More basic
  • B. No change
  • C. Less basic
  • D. More acidic

Explanation: Group II metal oxides become more basic as you go down the column. As the electronegativities of the metals decrease down the group, hence…

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Correct answer: More basic

50. When magnesium reacts with steam what would be the end product?

  • A. Mg (OH)
  • B. MgO
  • C. MgO 10H2O
  • D. MgO2

Explanation: Metals react with water under different conditions and produce metal oxide or hydroxide and liberate hydrogen gas.

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Correct answer: MgO

51. Which metal imparts green color to bunsen flame?

  • A. Na
  • B. Ca
  • C. Sr
  • D. Ba

Explanation: A flame test is an analytical procedure used by chemists to detect the presence of particular metal ions, based on the color of the flame…

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Correct answer: Ba

52. Beryllium, a member of alkaline earth metal, is almost as hard as:

  • A. calcium
  • B. Potassium
  • C. iron
  • D. magnesium

Explanation: The Mohs scale of mineral hardness is used to compare the scratch resistance of different minerals.

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Correct answer: iron

53. Refratory bricks used for furnace lining are formed by mixing and drying:

  • A. MgO and clay
  • B. MgCO3 and clay
  • C. MgSO4 and clay
  • D. MgCO3 and CaCO3

Explanation: Refractory materials can withstand high temperatures. Refractory bricks are used in lining furnaces, kilns, fireboxes, and fireplaces.

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Correct answer: MgO and clay

54. Conc. HCI is added to a metal salt and then subjected to flame test on platinum wire. It Imparts crimson color to the flame. Which metal salt it is?

  • A. Sodium
  • B. Potassium
  • C. Strontium
  • D. Calcium

Explanation: The correct answer is Strontium because it imparts a crimson red color to the flame when subjected to a flame test.

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Correct answer: Strontium

55. A dilute hydrochloric acid is added to a flask containing time stone a gas is produced which is dissolved in time water in a test tube a white precipitate is formed the precipitate is of:

  • A. CaSO4
  • B. CaCO3
  • C. CaCl2
  • D. MgCO3

Explanation: In this reaction, dilute hydrochloric acid reacts with a carbonate compound, releasing carbon dioxide gas (CO2).

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Correct answer: CaCO3

56. The cation that distort the electron cloud of NO3− ion more and facilitates its decomposition is:

  • A. Li+
  • B. Mg2+
  • C. Cs+
  • D. Be2+

Explanation: Polarizability refers to the ability of a cation to distort the electron cloud of an anion in an ionic compound and the anionic cloud is…

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Correct answer: Be2+
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