Which one of the following alkali metals forms only normal oxide when it reacts with O2 ?
Correct answer: A. Lithium
- A. Lithium
- B. Sodium
- C. Potassium
- D. Rubidium
Explanation
Lithium reacts with oxygen mainly to form the normal oxide, Li2O. The larger alkali metals form peroxides or superoxides because their larger cations can stabilize these larger oxide ions. Students may choose sodium because it is also commonly associated with oxides, but sodium forms mainly sodium peroxide in excess oxygen.
Last updated
About Reactions of Group I Elements
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.
Practise s-Block and p-Block Elements
1,359 free s-Block and p-Block Elements MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
A elements are named as alkali metals because_______________?
A metal form strong base salts and stable carbonates. The metal is:
Alkali and alkaline earth metals impart colours when heated over the burner, it is due to?
Ammonia may be prepared by heating ammonium chloride with_______________?
Ammonia may be prepared by heating ammonium chloride with: