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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?
Verified Answer
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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Most Upvoted Answer
Read the following passage and answer the questions.Sohan went door t...


Explanation:

Aqua regia:
Aqua regia is a highly corrosive mixture of nitric acid and hydrochloric acid in a 1:3 ratio. It is one of the few reagents that can dissolve gold and platinum.

Composition:
- Aqua regia is composed of nitric acid (HNO3) and hydrochloric acid (HCl) in a 1:3 ratio.
- The nitric acid oxidizes the metal to +3 ions, while the hydrochloric acid provides chloride ions that complex with the metal ions.

Ability to dissolve gold:
- Gold is a noble metal that does not easily react with most acids. However, aqua regia can dissolve gold due to its highly oxidizing nature.
- The nitric acid in aqua regia oxidizes the gold, forming gold ions (Au3+), which can then be complexed by the chloride ions from hydrochloric acid.

Application in gold refining:
- Aqua regia is commonly used in the gold refining industry to dissolve and separate gold from other metals.
- It is also used by fraudsters like Sohan in the passage to dissolve gold ornaments and reduce their weight.

Conclusion:
In the passage, Sohan used aqua regia to dissolve the gold bangles, making them sparkle like new but reducing their weight drastically. This deceptive practice highlights the importance of being cautious when dealing with unknown individuals offering such services.
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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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