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4. d and f- block elements — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry4. d and f- block elements1 Mark
MCQ
Given below are two statements :

Statement $I$ : The higher oxidation states are more stable down the group among transition elements unlike p-block elements.

Statement $II$ : Copper can not liberate hydrogen from weak acids.

In the light of the above statements, choose the correct answer from the options given below :

  • A
     Both Statement $I$ and Statement $II$ are false
  • B
     Statement $I$ is false but Statement $II$ is true
  • ✓
    Both Statement $I$ and Statement $II$ are true
  • D
     Statement $I$ is true but Statement $II$ is false
✓

Answer

Correct option: C.
Both Statement $I$ and Statement $II$ are true
c
On moving down the group in transition elements, stability of higher oxidation state increases, due to increase in effective nuclear charge.

$ \Rightarrow \mathrm{E}_{\mathrm{Cu}^{+2} / \mathrm{Cu}}^{\circ}=0.34 \mathrm{~V} $

$ \Rightarrow \mathrm{E}_{\mathrm{H}^{+} / \mathrm{H}_2}^{\circ}=0 $

$ \mathrm{SRP}: \mathrm{Cu}^{2+}>\mathrm{H}^{+}$

$\mathrm{Cu}$ can't liberate hydrogen gas from weak acid.

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