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Standard XII
Chemistry
Characteristics of Chemical Equilibrium
Question

Attainment of equilibrium in a coloured gaseous reversible reaction is detected by the constancy of:
  1. colour
  2. density
  3. pressure
  4. all the above properties of the mixture

A
pressure
B
all the above properties of the mixture
C
colour
D
density
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Solution
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The intensity of color represents the concentration of either reactant or product. Thus when in a colored gaseous reversible reaction, the color has attained constant intensity, the concentrations of reactants and products have reached equilibrium values. In other words, an equilibrium is attained.

Hence, the correct option is A.

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