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Upon long standing concetrated HNO(3)...

Upon long standing concetrated `HNO_(3)`

A

remains colourless, but gives out NO

B

turns yellow brown due to formation of `NO_(2)`

C

turns yellow brown due to the formation of `N_(2)O_(4)`

D

remains colourless, but gives `N_(2)O`

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The correct Answer is:
B
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