Question

Assertion :The equilibrium constant is fixed and characteristic for any given chemical reaction at a specified temperature. Reason: The composition of the final equilibrium mixture at a particular temperature depends upon the starting amount of reactants.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

The position of equilibrium of any chemical

reaction is given by its equilibrium constant. For

the generalized reaction $A+B\rightleftharpoons C+D$ an

equilibrium constant can be defined in term of

the concentration of reactants (A and B) and

products (C and D) present at equilibrium (as

given below),

$K_{eq}=\frac{\left[C\right]\left[D\right]}{\left[A\right]\left[B\right]}$

The equilibrium constant is fixed and

characteristic for any given chemical reaction at a

specified temperature. It defines the composition

of the final equilibrium mixture of that reaction,

regardless of the starting amounts of reactants and

products. Conversely, one can calculate the equi-

librium constant for a given reaction at a given

temperature, if the equilibrium concentrations of

all its reactants and products are known.