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JEE Main · 2015 · 04 Apr 2015 · Offline · p-Block Elements

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Assertion : Nitrogen and Oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen.
Reason : The reaction between nitrogen and oxygen requires high temperature.
  1. (A)Both assertion and reason are correct, but the reason is not the correct explanation for the assertion
  2. (B)The assertion is incorrect, but the reason is correct
  3. (C)Both the assertion and reason are incorrect
  4. (D)Both assertion and reason are correct, and the reason is the correct explanation for the assertion✓ Correct

Answer: (D)

Solution

Both statements stand on their own, and one explains the other. It is true that atmospheric nitrogen and oxygen sit side by side without combining under ordinary conditions, and the reason is the formidable triple bond, whose roughly kJ/mol must be supplied before any reaction can start -- which is why oxides of nitrogen form only in lightning or hot engines. Since that high-temperature requirement is precisely what keeps the two gases inert together, the reason correctly explains the assertion.

JEE Main · 2015 · 04 Apr 2015 · Offline · Single correct option

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