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Free Reactions of Group I Elements MCQs with Answers

68 Reactions of Group I 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 I elements have one valence electron, so their reactivity increases down the group as ionisation energy decreases. Their reactions with water, oxygen, hydrogen and halogens produce hydroxides, oxides, hydrides and halides, while the behaviour of lithium differs from the heavier metals because of its small ionic size.

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68 questions · page 4 of 4

61. A metal form strong base salts and stable carbonates. The metal is:

  • A. Transition metal
  • B. Alkali metal
  • C. Alkaline earth metal
  • D. None of above

Explanation: Group 1 elements, known as Alkali metals, fit the criteria of forming strong base salts and stable carbonates due to their low polarizing…

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Correct answer: Alkali metal

62. Reason for alkali metals to be soft is that

  • A. They are less metallic in nature
  • B. There is only one valency
  • C. They do not having tightly packed structures
  • D. They have high IE

Explanation: Alkali metals are soft because of their large atomic size and single valence electron, leading to weaker metallic bonds between atoms.

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Correct answer: They do not having tightly packed structures

63. When the nitrates of Na,Li,Ca and Sr were heated strongly in separate containers, all of them gave reddish brown colour except the nitrate of:

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

Explanation: LiNO₃ → gives Li₂O + NO₂ (brown gas) + O₂.ng.

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Correct answer: Li

64. Potassium is found in nature as carnallite, its composition is:

  • A. KAlSi3O8
  • B. KCl·MgCl2·6H2O
  • C. KCl
  • D. KCl·Al2O3·2H2O

Explanation: Carnallite is a hydrated potassium magnesium chloride mineral with the chemical formula KCl·MgCl2·6H2O.

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Correct answer: KCl·MgCl2·6H2O

65. Two atoms A and B have the electronic configuration given below:(x) IS22S12P63S1 (y) IS2 2S22P5 Which of the following compounds are they likely to form?

  • A. Xy
  • B. Xy2
  • C. X1y
  • D. Xy3

Explanation: The valence shell configuration of x indicates that it belongs to group I-A (the alkali metals) while the valence configuration of y…

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Correct answer: Xy

66. Lithium reacts with air to form:

  • A. Li2O
  • B. Li2N
  • C. Li2O2 + Li2CO3
  • D. Both (a) & (b)

Explanation: Lithium reacts with the oxygen in the air to form lithium oxide (Li2O) and with nitrogen to form lithium nitride (Li3N).

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Correct answer: Both (a) & (b)

67. Which element can form super oxides?

  • A. Cs
  • B. Rb
  • C. K
  • D. All of the above

Explanation: Alkali metals form oxides (O²⁻), peroxides (O₂²⁻), or superoxides (O₂⁻) depending on their size.Larger cations stabilize larger anions:Li…

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Correct answer: All of the above

68. Which of the following has a greater affinity for oxygen:

  • A. B
  • B. Na
  • C. K
  • D. Mg

Explanation: Boron (B) is more electronegative compared to the other elements listed (Na, K, and Mg).

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Correct answer: K
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