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p -Block elements - ll — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistryp -Block elements - ll1 Mark
MCQ
Assertion : Anhydrous $BaO_2$ is used for preparing $H_2O_2$.

Reason : Hydrated $BaO_2$ is not available.

  • A
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • ✓
    If the Assertion is correct but Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: C.
If the Assertion is correct but Reason is incorrect.
c
Oxygen can form $2 \mathrm{p} \pi-2 \mathrm{p} \pi$ multiple bond with itself due to its small size while sulphur cannot form multiple bond with itself as $3 \mathrm{p} \pi-3 \mathrm{p} \pi$ bond will be unstable due to large size of sulphur, but sulphur can form multiple bond with small size atom like $\mathrm{C}$ and $\mathrm{N}$.

$\text { eg. } \mathrm{S}=\mathrm{C}=\mathrm{S}$

$\mathrm{S}=\mathrm{C}=\mathrm{N} \leftrightarrow \mathrm{S}^{\odot}-\mathrm{C} \equiv{N}$

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