JEE Main 2016 Chemistry question

The reaction of zinc with dilute and concentrated nitric acid, respectively, produces:

(1)NO and
(2) and
(3) and Correct
(4) and NO

Answer: (3)

Solution

Nitric acid is reduced to different products depending on how concentrated it is, and the more dilute the acid the *further* the nitrogen is reduced. With **dilute** , zinc (an active metal) reduces nitrogen all the way to the state, giving nitrous oxide:

4Zn + 10HNO_3(dil) →

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Question ID VK-115454