Chemistry - Complete s-block Question with Solution | TestHub
ChemistryComplete s-blocks-block IAMedium2 minQB
ChemistryMediuminteger
Observe the following thermal decomposition behavior of the compound:
METAL PEROXIDE METAL OXIDE + O₂ (dioxygen)
How many of the following compounds give dioxygen gas more easily than Cs₂O₂ on heating?
BaO₂ , K₂O₂ , Na₂O₂ , CaO₂ , Li₂O₂ , MgO₂
Answer:
6
Solution:
The thermal stability of peroxides decreases down a group and increases across a period. Cs₂O₂ is the least stable among alkali metal peroxides. All given peroxides (BaO₂, K₂O₂, Na₂O₂, CaO₂, Li₂O₂, MgO₂) are less stable than Cs₂O₂ and thus decompose more easily to give O₂. Therefore, 6 compounds.
Stream:JEESubject:ChemistryTopic:Complete s-blockSubtopic:s-block IA
⏱ 2mℹ️ Source: QB
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