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

CBSE BoardEnglish MediumSTD 12 ScienceChemistryp -Block elements - ll1 Mark
MCQ
Below are two statements. One is labeled as Assertion $(A)$ and the other as Reason $(R):$

Assertion $(A):$ $​\mathrm{H}_2 \mathrm{Te}$ is more acidic than $\mathrm{H}_2 \mathrm{~S}$.

Reason $(R):$  The bond dissociation enthalpy of $\mathrm{H}_2 \mathrm{Te}$ is less than that of $\mathrm{H}_2 \mathrm{~S}$.

In the context of the above statements, choose the correct answer from the following options:

  • A
    Both $A$ and $R$ are true, but $R$ is not the correct explanation of $A.$

     

  • ✓
    Both $A$ and $R$ are true, and $R$ is the correct explanation of $A.$
  • C
    $A$ is false, but $R$ is true.
  • D
    $A $ is true, but $R$ is false

     

✓

Answer

Correct option: B.
Both $A$ and $R$ are true, and $R$ is the correct explanation of $A.$
b
Due to lower Bond dissociation enthalpy of $\mathrm{H}_2 \mathrm{Te}$ it ionizes to give $\mathrm{H}^{+}$more easily than $\mathrm{H}_2 \mathrm{~S}$.

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