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NEETChemistryChemical Equilibrium

What causes the brown color of NO 2 gas to decrease in intensity at low temperatures?

Options

  1. AThe brown color of NO 2 gas is temperature-independent.
  2. BThe forward reaction at low temperatures results in the formation of N 2 O 4 , which is colorless.
  3. CThe reverse reaction at low temperatures consumes NO 2 , causing the color to fade.
  4. DThe brown color becomes more intense at low temperatures.

Correct answer

B. The forward reaction at low temperatures results in the formation of N 2 O 4 , which is colorless.

Step-by-step solution

At low temperatures, the forward reaction of forming N 2 O 4 occurs, which is colorless, leading to a decrease in the intensity of the brown color of NO 2 gas.

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