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Question
The yellow colour shown by nitric acid can be removed by ______.
Options
adding magnesium powder
boiling the acid
passing ammonia through warm acid
passing air through warm acid
MCQ
Fill in the Blanks
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Solution
The yellow colour shown by nitric acid can be removed by passing air through warm acid.
Explanation:
Bubbling dry air or carbon dioxide through warm yellow nitric acid drives out the dissolved brown NO2 gas, making it colourless.
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