Question Detail

CHM 102 Sblock elements Objective Question
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Question

When Group 1 metals react with oxygen, which of the following statements about the products formed by Lithium, Sodium, and Potassium is correct?
Options
A Lithium forms a peroxide (Li₂O₂), Sodium forms a simple oxide (Na₂O), and Potassium forms a superoxide (KO₂).
B Lithium forms a simple oxide (Li₂O), Sodium forms a peroxide (Na₂O₂), and Potassium forms a superoxide (KO₂).
Correct Answer
C Lithium forms a simple oxide (Li₂O), Sodium forms a simple oxide (Na₂O), and Potassium forms a peroxide (K₂O₂).
D All three elements form only simple oxides when reacted with oxygen.
Correct Answer

Option B is the correct answer.

Detailed Explanation

Page 8 explicitly states: 'Lithium and sodium form simple oxides which contain the common O²⁻ ion.' and 'Sodium and potassium form peroxides containing the more complicated O₂²⁻ ion.' and 'Potassium, rubidium and caesium form superoxides O₂⁻'. Therefore, Lithium forms Li₂O, Sodium forms Na₂O₂ (in excess oxygen, as per page 7, and explicitly on page 8 for peroxides), and Potassium forms KO₂.

Hint

Review the 'Formation of oxides, peroxides and superoxides' section on page 8, noting the specific type of oxide formed by each metal.

Question Info

Course: CHM 102
Topic: Sblock elements
Type: Objective
Difficulty: Not specified
Question 1795 of 1999
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