Q1 / 90 · JEE Main 2024 (09 Apr Shift 2) · Chemistry

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 :

  • Correct answer
    A
    Both Statement I and Statement II are true
  • B
    Statement I is false but Statement II is true
  • C
    Both Statement I and Statement II are false
  • D
    Statement I is true but Statement II is false

Solution

On moving down the group in transition elements, stability of higher oxidation state increases, due to increase in effective nuclear charge. $\begin{aligned} & \Rightarrow \mathrm{E}_{\mathrm{Cu}^{+2} / \mathrm{Cu}}^{\circ}=0.34 \mathrm{~V} \\ & \Rightarrow \mathrm{E}_{\mathrm{H}^{+} / \mathrm{H}_2}^{\circ}=0 \\ & \mathrm{SRP}: \mathrm{Cu}^{2+}>\mathrm{H}^{+}\end{aligned}$ Cu can't liberate hydrogen gas from weak acid.

Hence, the correct answer is option: 'A'.

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