Which of the following statements is incorrect

Options

A. In equilibrium mixture office and water kept in perfectly insulated flask mass ofice and water does not change with time.
B. The intensity of red colour increases when oxalic acid is added to a solution containing iron (III) nitrate and potassium thiocyanate.
C. On addition of catalyst the equilibrium constant value is not affected.
D. Equilibrium constant for a reaction with negative `triangleH` value decreases as the temperature increases.

Answer

B

Explanation

In the reaction `Fe^(3+)+SCN^(-) Leftrightarrow FeSCN^(2+)`
When oxalic acid is added it combines with `Fe^(3+)` ions, then, equilibrium shifts towards backward direction and intensity of red colour decreases.