The chemical formula for cesium peroxide is
A) CsOH
B) CsO2.
C) Cs20.
D) Cs202.
The correct answer and explanation is :
The correct answer is:
D) Cs₂O₂ (Cesium Peroxide)
Explanation:
- Understanding Peroxides:
- A peroxide is a compound containing the peroxide ion (O₂²⁻), which consists of two oxygen atoms bonded together with an overall charge of -2.
- Alkaline and alkaline earth metals can form peroxides when reacting with oxygen.
- Cesium’s Chemical Properties:
- Cesium (Cs) is an alkali metal (Group 1 on the periodic table).
- Alkali metals readily react with oxygen to form different types of oxides, including normal oxides (O²⁻), peroxides (O₂²⁻), and superoxides (O₂⁻).
- Cesium is highly reactive and tends to form peroxides or superoxides rather than simple oxides.
- Formation of Cesium Peroxide:
- When cesium reacts with oxygen, it can form cesium peroxide (Cs₂O₂), where two cesium (Cs⁺) ions balance the charge of one peroxide ion (O₂²⁻).
- The reaction is as follows: [
2Cs + O_2 \rightarrow Cs_2O_2
]
- Eliminating Incorrect Answers:
- (A) CsOH: This is cesium hydroxide, not a peroxide.
- (B) CsO₂: This would represent cesium superoxide, but the question asks for peroxide.
- (C) Cs₂O: This is cesium oxide, which contains the oxide ion (O²⁻), not the peroxide ion (O₂²⁻).
- (D) Cs₂O₂: This correctly represents cesium peroxide, which contains the peroxide ion.
Conclusion:
Cesium forms Cs₂O₂ when it reacts with oxygen, making option D the correct answer.