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In the following question, a statement o...

In the following question, a statement of assertion is followed by a statement of reason . Mark the correct choice.
Assertion : ` [Cu(NH_(3))_(4)]^(2+)` is coloured while ` [Cu(CN)_(4)]^(3-)` is colourless .
Reason : ` [Cu(NH_(3))_(4)]^(2+)` has ` dsp^(2)` hydridisation

A

Both assertion and reason are true and reason is the correct explanation of assertion .

B

Both assertion and reason are true but reason . Is not the correct explanation of assertion.

C

Assertion is true but reason is false.

D

Both assertion and reason are false.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we will analyze both the assertion and the reason provided. ### Step-by-Step Solution: 1. **Understanding the Assertion**: - The assertion states that `[Cu(NH₃)₄]²⁺` is colored while `[Cu(CN)₄]³⁻` is colorless. - To evaluate this, we need to consider the oxidation states and electronic configurations of copper in both complexes. 2. **Analyzing `[Cu(NH₃)₄]²⁺`**: - Ammonia (NH₃) is a neutral ligand, so the oxidation state of copper in this complex is +2. - The electron configuration of copper is [Ar] 3d¹⁰ 4s¹. For Cu²⁺, it becomes 3d⁹ (since it loses two electrons). - In the 3d⁹ configuration, there is one unpaired electron, which allows for d-d transitions when light is absorbed, resulting in a colored complex. 3. **Analyzing `[Cu(CN)₄]³⁻`**: - Cyanide (CN⁻) is a strong field ligand, and here, the oxidation state of copper is +1 (since CN⁻ has a -1 charge and the overall charge is -3). - The electron configuration for Cu⁺ is 3d¹⁰ (it loses one 4s electron). - With a fully filled 3d¹⁰ configuration, there are no unpaired electrons, meaning there are no d-d transitions possible. Thus, this complex is colorless. 4. **Understanding the Reason**: - The reason states that `[Cu(NH₃)₄]²⁺` has dsp² hybridization. - However, for `[Cu(NH₃)₄]²⁺`, the hybridization is actually sp³ due to the four ammonia ligands forming a tetrahedral arrangement around the copper ion. 5. **Conclusion**: - The assertion is true: `[Cu(NH₃)₄]²⁺` is colored and `[Cu(CN)₄]³⁻` is colorless. - The reason is false because the hybridization of `[Cu(NH₃)₄]²⁺` is not dsp² but rather sp³. ### Final Answer: - The correct choice is that the assertion is true, but the reason is false.
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