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JEE Main 20249 AprilEvening Shift
Exam
JEE Main
Year
2024
Date
9 April
Shift
Evening Shift
Subject
Chemistry
Chapter
d and f Block Elements

JEE Main 2024 · 9 April · Evening Shift · Chemistry · d and f Block Elements

Give below are two statements: Statement I : The higher oxidation...

Give 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 :

Options

  1. ABoth Statement I and Statement II are true
  2. BStatement I is false but Statement II is true
  3. CBoth Statement I and Statement II are false
  4. DStatement I is true but Statement II is false

Correct answer

A. Both Statement I and Statement II are true

Step-by-step solution

On moving down the group in transition elements, stability of higher oxidation state increases, due to increase in effective nuclear charge. ⇒ECu+2/Cu∘=0.34 V⇒EH+/H2∘=0SRP:Cu2+>H+\begin{aligned} & \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}^{+}\end{aligned} Cu can't liberate hydrogen gas from weak acid.
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