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Read the following passage and answer the questions.
Sohan went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was sad but after a futile argument, the man beat a hasty retreat.
Which of the following is used for dissolution of gold?
- a)Hydrochloric acid
- b)Sulphuric acid
- c)Nitric acid
- d)Aqua regia
Correct answer is option 'D'. Can you explain this answer?
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Read the following passage and answer the questions.Sohan went door t...
Aqua Regia is a mixture of concentrated HNO3 and concentrated HCl. It is used for dissolution of gold.
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Read the following passage and answer the questions.Sohan went door t...
Answer:
Introduction:
In the given passage, Sohan, posing as a goldsmith, deceived an unsuspecting lady by promising to restore the shine of her old and dull gold bangles. However, he used a solution that not only made the bangles sparkle but also drastically reduced their weight. The lady was left disappointed and Sohan quickly retreated after a futile argument.
Dissolution of Gold:
The solution used by Sohan to dissolve gold is aqua regia.
Explanation:
1. Dissolving Gold:
- Aqua regia is a highly corrosive mixture of concentrated nitric acid (HNO3) and concentrated hydrochloric acid (HCl).
- It is called "aqua regia," which means "royal water," because it can dissolve noble metals like gold and platinum.
2. Composition of Aqua Regia:
- Aqua regia is prepared by mixing concentrated nitric acid and concentrated hydrochloric acid in a specific ratio, usually 1:3 or 1:4.
- The mixture combines the oxidizing properties of nitric acid with the chloride ions from hydrochloric acid, creating a potent solvent.
3. Dissolving Gold with Aqua Regia:
- Gold is a noble metal, which means it is resistant to corrosion or oxidation by most acids.
- However, aqua regia is capable of dissolving gold due to the presence of both nitric acid and hydrochloric acid.
- The nitric acid in aqua regia acts as an oxidizing agent, converting metallic gold (Au) into soluble gold ions (Au3+).
- The hydrochloric acid provides chloride ions (Cl-) that form complexes with the gold ions, preventing them from precipitating and keeping them in solution.
Conclusion:
In the given passage, Sohan used aqua regia to dissolve the gold bangles, which resulted in their sparkling appearance but also caused a significant reduction in their weight. Aqua regia is a powerful solvent due to the combination of concentrated nitric acid and concentrated hydrochloric acid, enabling it to dissolve noble metals like gold.
Introduction:
In the given passage, Sohan, posing as a goldsmith, deceived an unsuspecting lady by promising to restore the shine of her old and dull gold bangles. However, he used a solution that not only made the bangles sparkle but also drastically reduced their weight. The lady was left disappointed and Sohan quickly retreated after a futile argument.
Dissolution of Gold:
The solution used by Sohan to dissolve gold is aqua regia.
Explanation:
1. Dissolving Gold:
- Aqua regia is a highly corrosive mixture of concentrated nitric acid (HNO3) and concentrated hydrochloric acid (HCl).
- It is called "aqua regia," which means "royal water," because it can dissolve noble metals like gold and platinum.
2. Composition of Aqua Regia:
- Aqua regia is prepared by mixing concentrated nitric acid and concentrated hydrochloric acid in a specific ratio, usually 1:3 or 1:4.
- The mixture combines the oxidizing properties of nitric acid with the chloride ions from hydrochloric acid, creating a potent solvent.
3. Dissolving Gold with Aqua Regia:
- Gold is a noble metal, which means it is resistant to corrosion or oxidation by most acids.
- However, aqua regia is capable of dissolving gold due to the presence of both nitric acid and hydrochloric acid.
- The nitric acid in aqua regia acts as an oxidizing agent, converting metallic gold (Au) into soluble gold ions (Au3+).
- The hydrochloric acid provides chloride ions (Cl-) that form complexes with the gold ions, preventing them from precipitating and keeping them in solution.
Conclusion:
In the given passage, Sohan used aqua regia to dissolve the gold bangles, which resulted in their sparkling appearance but also caused a significant reduction in their weight. Aqua regia is a powerful solvent due to the combination of concentrated nitric acid and concentrated hydrochloric acid, enabling it to dissolve noble metals like gold.
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Read the following passage and answer the questions.Sohan went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was sad but after a futile argument, the man beat a hasty retreat.Which of the following is used for dissolution of gold?a)Hydrochloric acidb)Sulphuric acidc)Nitric acidd)Aqua regiaCorrect answer is option 'D'. Can you explain this answer?
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Read the following passage and answer the questions.Sohan went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was sad but after a futile argument, the man beat a hasty retreat.Which of the following is used for dissolution of gold?a)Hydrochloric acidb)Sulphuric acidc)Nitric acidd)Aqua regiaCorrect answer is option 'D'. Can you explain this answer? for Class 10 2024 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about Read the following passage and answer the questions.Sohan went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was sad but after a futile argument, the man beat a hasty retreat.Which of the following is used for dissolution of gold?a)Hydrochloric acidb)Sulphuric acidc)Nitric acidd)Aqua regiaCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 10 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Read the following passage and answer the questions.Sohan went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was sad but after a futile argument, the man beat a hasty retreat.Which of the following is used for dissolution of gold?a)Hydrochloric acidb)Sulphuric acidc)Nitric acidd)Aqua regiaCorrect answer is option 'D'. Can you explain this answer?.
Read the following passage and answer the questions.Sohan went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was sad but after a futile argument, the man beat a hasty retreat.Which of the following is used for dissolution of gold?a)Hydrochloric acidb)Sulphuric acidc)Nitric acidd)Aqua regiaCorrect answer is option 'D'. Can you explain this answer? for Class 10 2024 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about Read the following passage and answer the questions.Sohan went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was sad but after a futile argument, the man beat a hasty retreat.Which of the following is used for dissolution of gold?a)Hydrochloric acidb)Sulphuric acidc)Nitric acidd)Aqua regiaCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 10 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Read the following passage and answer the questions.Sohan went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was sad but after a futile argument, the man beat a hasty retreat.Which of the following is used for dissolution of gold?a)Hydrochloric acidb)Sulphuric acidc)Nitric acidd)Aqua regiaCorrect answer is option 'D'. Can you explain this answer?.
Solutions for Read the following passage and answer the questions.Sohan went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was sad but after a futile argument, the man beat a hasty retreat.Which of the following is used for dissolution of gold?a)Hydrochloric acidb)Sulphuric acidc)Nitric acidd)Aqua regiaCorrect answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 10.
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