Which of the following statements is incorrect?

Options

A. In equilibrium mixture of ice and water kept in perfectly insulated flask mass of ice and water do not change with time.
B. the intensity of red colur 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. equilibrim constant for a reaction with negative `DeltaH` value dcreases as the temperature increases.

Explanation

The statement is incorrect. The reaction taking place in solution is :
`Fe^(3+) (aq) + 3 SCN^(-) (aq) hArr Fe (SCN)_(3)`
Red colour
Oxalic acid `(H_(2)C_(2)O_(4))` reacts with `Fe^(3+) (aq)` present in solution to from complex `Fe (SCN)_(3)`. AS a result the concentration of `Fe^(3+)` ions in the solution decreases and the intensity of red colour decreases.