Class 12 Exam > Class 12 Questions > The compound formed by dissolving gold and pl... Start Learning for Free
The compound formed by dissolving gold and platinum in aqua-regia is
- a)[AuCI4]3- and [PtCl6]2-
- b)[AuCI4]- and [PtCI6]4-
- c)[AuCI4]- and [PtCI6]2-
- d)[AuCI4]- and [PtCI4]2-
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
The compound formed by dissolving gold and platinum in aqua-regia isa)...
Most Upvoted Answer
The compound formed by dissolving gold and platinum in aqua-regia isa)...
Understanding Aqua Regia
Aqua regia is a powerful acidic solution, typically a mixture of hydrochloric acid (HCl) and nitric acid (HNO3). It is renowned for its ability to dissolve noble metals like gold and platinum.
Formation of Complex Ions
When gold (Au) and platinum (Pt) are dissolved in aqua regia, they form complex ions:
- Gold typically forms the tetrachloroaurate ion: [AuCl4]-
- Platinum forms the hexachloroplatinate ion: [PtCl6]2-
Why Option C is Correct
The correct answer is option C, which states that the compounds formed are [AuCl4]- and [PtCl6]2-. Here’s why:
- Gold Complex: Au reacts with chloride ions in the solution to form the negatively charged tetrachloroaurate ion [AuCl4]-.
- Platinum Complex: Similarly, platinum in aqua regia forms the hexachloroplatinate ion [PtCl6]2-, which has a 2- charge due to the coordination of six chloride ions.
Comparison with Other Options
- Option A: Incorrect, as [PtCl6]2- is accurate, but [AuCl4]3- is not a valid oxidation state for gold in this context.
- Option B: Incorrect, as [PtCl6]4- does not exist; platinum does not form a 4- charged complex in this reaction.
- Option D: Incorrect, [PtCl4]2- is not formed; platinum forms a hexachloride complex rather than a tetrachloride.
Conclusion
In summary, when gold and platinum dissolve in aqua regia, they produce the stable complexes [AuCl4]- and [PtCl6]2-, making option C the correct choice.
Aqua regia is a powerful acidic solution, typically a mixture of hydrochloric acid (HCl) and nitric acid (HNO3). It is renowned for its ability to dissolve noble metals like gold and platinum.
Formation of Complex Ions
When gold (Au) and platinum (Pt) are dissolved in aqua regia, they form complex ions:
- Gold typically forms the tetrachloroaurate ion: [AuCl4]-
- Platinum forms the hexachloroplatinate ion: [PtCl6]2-
Why Option C is Correct
The correct answer is option C, which states that the compounds formed are [AuCl4]- and [PtCl6]2-. Here’s why:
- Gold Complex: Au reacts with chloride ions in the solution to form the negatively charged tetrachloroaurate ion [AuCl4]-.
- Platinum Complex: Similarly, platinum in aqua regia forms the hexachloroplatinate ion [PtCl6]2-, which has a 2- charge due to the coordination of six chloride ions.
Comparison with Other Options
- Option A: Incorrect, as [PtCl6]2- is accurate, but [AuCl4]3- is not a valid oxidation state for gold in this context.
- Option B: Incorrect, as [PtCl6]4- does not exist; platinum does not form a 4- charged complex in this reaction.
- Option D: Incorrect, [PtCl4]2- is not formed; platinum forms a hexachloride complex rather than a tetrachloride.
Conclusion
In summary, when gold and platinum dissolve in aqua regia, they produce the stable complexes [AuCl4]- and [PtCl6]2-, making option C the correct choice.
 | Explore Courses for Class 12 exam |  |
Top Courses for Class 12View all
Top Courses for Class 12
Question Description
The compound formed by dissolving gold and platinum in aqua-regia isa)[AuCI4]3-and [PtCl6]2-b)[AuCI4]-and [PtCI6]4-c)[AuCI4]-and [PtCI6]2-d)[AuCI4]-and [PtCI4]2-Correct answer is option 'C'. Can you explain this answer? for Class 12 2026 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about The compound formed by dissolving gold and platinum in aqua-regia isa)[AuCI4]3-and [PtCl6]2-b)[AuCI4]-and [PtCI6]4-c)[AuCI4]-and [PtCI6]2-d)[AuCI4]-and [PtCI4]2-Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 12 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The compound formed by dissolving gold and platinum in aqua-regia isa)[AuCI4]3-and [PtCl6]2-b)[AuCI4]-and [PtCI6]4-c)[AuCI4]-and [PtCI6]2-d)[AuCI4]-and [PtCI4]2-Correct answer is option 'C'. Can you explain this answer?.
The compound formed by dissolving gold and platinum in aqua-regia isa)[AuCI4]3-and [PtCl6]2-b)[AuCI4]-and [PtCI6]4-c)[AuCI4]-and [PtCI6]2-d)[AuCI4]-and [PtCI4]2-Correct answer is option 'C'. Can you explain this answer? for Class 12 2026 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about The compound formed by dissolving gold and platinum in aqua-regia isa)[AuCI4]3-and [PtCl6]2-b)[AuCI4]-and [PtCI6]4-c)[AuCI4]-and [PtCI6]2-d)[AuCI4]-and [PtCI4]2-Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 12 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The compound formed by dissolving gold and platinum in aqua-regia isa)[AuCI4]3-and [PtCl6]2-b)[AuCI4]-and [PtCI6]4-c)[AuCI4]-and [PtCI6]2-d)[AuCI4]-and [PtCI4]2-Correct answer is option 'C'. Can you explain this answer?.
Solutions for The compound formed by dissolving gold and platinum in aqua-regia isa)[AuCI4]3-and [PtCl6]2-b)[AuCI4]-and [PtCI6]4-c)[AuCI4]-and [PtCI6]2-d)[AuCI4]-and [PtCI4]2-Correct answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12. Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free.
Here you can find the meaning of The compound formed by dissolving gold and platinum in aqua-regia isa)[AuCI4]3-and [PtCl6]2-b)[AuCI4]-and [PtCI6]4-c)[AuCI4]-and [PtCI6]2-d)[AuCI4]-and [PtCI4]2-Correct answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of The compound formed by dissolving gold and platinum in aqua-regia isa)[AuCI4]3-and [PtCl6]2-b)[AuCI4]-and [PtCI6]4-c)[AuCI4]-and [PtCI6]2-d)[AuCI4]-and [PtCI4]2-Correct answer is option 'C'. Can you explain this answer?, a detailed solution for The compound formed by dissolving gold and platinum in aqua-regia isa)[AuCI4]3-and [PtCl6]2-b)[AuCI4]-and [PtCI6]4-c)[AuCI4]-and [PtCI6]2-d)[AuCI4]-and [PtCI4]2-Correct answer is option 'C'. Can you explain this answer? has been provided alongside types of The compound formed by dissolving gold and platinum in aqua-regia isa)[AuCI4]3-and [PtCl6]2-b)[AuCI4]-and [PtCI6]4-c)[AuCI4]-and [PtCI6]2-d)[AuCI4]-and [PtCI4]2-Correct answer is option 'C'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice The compound formed by dissolving gold and platinum in aqua-regia isa)[AuCI4]3-and [PtCl6]2-b)[AuCI4]-and [PtCI6]4-c)[AuCI4]-and [PtCI6]2-d)[AuCI4]-and [PtCI4]2-Correct answer is option 'C'. Can you explain this answer? tests, examples and also practice Class 12 tests.
| Explore Courses for Class 12 exam | |
Top Courses for Class 12
Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
