Chemistry
Give reasons for the following:
Nitric acid finds application in the purification of gold.
Nitric Acid
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Answer
Crude gold contains Cu, Ag, Zn, Pb etc., as impurities which dissolve in HNO3 while gold is unaffected. Hence, nitric acid finds application in the purification of gold.
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Related Questions
Give reasons for the following:
The yellow colour of nitric acid obtained in the laboratory is removed by bubbling air through it.
Give reasons for the following:
Nitric acid is a stronger oxidising agent in the conc. state of the acid than in the dilute state.
Give reasons for the following:
Nitric acid affects the skin if it accidently falls on it, staining the skin yellow.
Answer the following questions pertaining to the brown ring test for nitric acid:
![Answer the following questions pertaining to the brown ring test for nitric acid. Name the chemical constituent of the brown ring Y. Which of the two solutions – iron [II] sulphate or conc. sulphuric acid, do X and Z represent. State why the unstable brown ring decomposes completely on disturbing the test tube. Give a reason why the brown ring does not settle down at the bottom of the test tube. Name the gas evolved when acidified iron [II] sulphate reacts with dilute nitric acid in the brown ring test. Study of Nitric Acid, Simplified Chemistry Dalal Solutions ICSE Class 10.](https://cdn1.knowledgeboat.com/img/scd10/brown-ring-test-simplified-chemistry-icse-class-10-649x1280.jpg)
- Name the chemical constituent of the brown ring 'Y'.
- Which of the two solutions – iron [II] sulphate or conc. sulphuric acid, do 'X' and 'Z' represent.
- State why the unstable brown ring decomposes completely on disturbing the test tube.
- Give a reason why the brown ring does not settle down at the bottom of the test tube.
- Name the gas evolved when acidified iron [II] sulphate reacts with dilute nitric acid in the brown ring test.