Q15 / 90 · JEE Main 2021 (25 Jul Shift 2) · Chemistry

Given below are two statements :
Statement I : Chlorofluoro carbons breakdown by radiation in the visible energy region and release chlorine gas in the atmosphere which then reacts with stratospheric ozone.

Statement II : Atmospheric ozone reacts with nitric oxide to give nitrogen and oxygen gases, which add to the atmosphere.

For the above statements choose the correct answer from the options given below :

  • A
    Statement I is incorrect but statement II is true
  • Correct answer
    B
    Both statement I and II are false
  • C
    Statement I is correct but statement II is false
  • D
    Both statement I and II are correct

Solution

Statement I:

CFCs are broken down by powerful UV radiation and releases chlorine free radical which reacts with ozone and start chain reaction.

Figure

Statement II:
Atmosphere ozone reacts with nitric oxide to produce nitrogen dioxide and oxygen.

NO(g)+O3( g)→NO2( g)+O2( g)

Hence, the correct answer is option: 'B'.

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