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The addition of excess of aqueous HNO3 to a solution containing [Cu(NH3)4]2+ produces [1999]
- a)Cu+
- b)[Cu(H2O)4]2+
- c)Cu(OH)2
- d)Cu(NO3)2
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
The addition of excess of aqueous HNO3 to a solution containing [Cu(NH...
[Cu (NH3)4]2+ on addition of excess of aqneous HNO3 gives [Cu (H2O)4]2+
Most Upvoted Answer
The addition of excess of aqueous HNO3 to a solution containing [Cu(NH...
Explanation:
When excess of HNO3 is added to a solution containing [Cu(NH3)4]2+, the following reaction takes place:
[Cu(NH3)4]2+ + 4H2O + 4HNO3 → [Cu(H2O)4]2+ + 4NH4+ + 4NO3−
The addition of HNO3 causes the NH3 ligands to be replaced by H2O ligands. This is because HNO3 is a strong oxidizing agent and can oxidize NH3 to N2 gas. The Cu2+ ion has a strong affinity for NH3 ligands due to the presence of lone pair electrons on the nitrogen atoms. However, H2O ligands are weaker ligands than NH3 and are easily replaced in the presence of excess HNO3.
The product formed is [Cu(H2O)4]2+. This is because Cu2+ ion has a d9 electronic configuration, which means it has one unpaired electron in the d-orbitals. The presence of four H2O ligands in an octahedral arrangement around the Cu2+ ion results in the formation of a coloured complex. The colour of the complex depends on the nature of the ligands and the oxidation state of the metal ion.
Conclusion:
Therefore, the correct option is B) [Cu(H2O)4]2+ as this is the product formed when excess of aqueous HNO3 is added to a solution containing [Cu(NH3)4]2+.
When excess of HNO3 is added to a solution containing [Cu(NH3)4]2+, the following reaction takes place:
[Cu(NH3)4]2+ + 4H2O + 4HNO3 → [Cu(H2O)4]2+ + 4NH4+ + 4NO3−
The addition of HNO3 causes the NH3 ligands to be replaced by H2O ligands. This is because HNO3 is a strong oxidizing agent and can oxidize NH3 to N2 gas. The Cu2+ ion has a strong affinity for NH3 ligands due to the presence of lone pair electrons on the nitrogen atoms. However, H2O ligands are weaker ligands than NH3 and are easily replaced in the presence of excess HNO3.
The product formed is [Cu(H2O)4]2+. This is because Cu2+ ion has a d9 electronic configuration, which means it has one unpaired electron in the d-orbitals. The presence of four H2O ligands in an octahedral arrangement around the Cu2+ ion results in the formation of a coloured complex. The colour of the complex depends on the nature of the ligands and the oxidation state of the metal ion.
Conclusion:
Therefore, the correct option is B) [Cu(H2O)4]2+ as this is the product formed when excess of aqueous HNO3 is added to a solution containing [Cu(NH3)4]2+.
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The addition of excess of aqueous HNO3 to a solution containing [Cu(NH...
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The addition of excess of aqueous HNO3 to a solution containing [Cu(NH3)4]2+ produces [1999]a)Cu+b)[Cu(H2O)4]2+c)Cu(OH)2d)Cu(NO3)2Correct answer is option 'B'. Can you explain this answer? for Class 12 2025 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about The addition of excess of aqueous HNO3 to a solution containing [Cu(NH3)4]2+ produces [1999]a)Cu+b)[Cu(H2O)4]2+c)Cu(OH)2d)Cu(NO3)2Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The addition of excess of aqueous HNO3 to a solution containing [Cu(NH3)4]2+ produces [1999]a)Cu+b)[Cu(H2O)4]2+c)Cu(OH)2d)Cu(NO3)2Correct answer is option 'B'. Can you explain this answer?.
The addition of excess of aqueous HNO3 to a solution containing [Cu(NH3)4]2+ produces [1999]a)Cu+b)[Cu(H2O)4]2+c)Cu(OH)2d)Cu(NO3)2Correct answer is option 'B'. Can you explain this answer? for Class 12 2025 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about The addition of excess of aqueous HNO3 to a solution containing [Cu(NH3)4]2+ produces [1999]a)Cu+b)[Cu(H2O)4]2+c)Cu(OH)2d)Cu(NO3)2Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The addition of excess of aqueous HNO3 to a solution containing [Cu(NH3)4]2+ produces [1999]a)Cu+b)[Cu(H2O)4]2+c)Cu(OH)2d)Cu(NO3)2Correct answer is option 'B'. Can you explain this answer?.
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