Which of the following statements is incorrect?

 (i) In equilibrium mixture of ice and water kept in perfectly insulated flask mass of ice and water does not change with time.

(ii) The intensity of red colour increases when oxalic acid is added to a solution containing iron (III) nitrate and potassium thiocyanate.

 (iii) On addition of a catalyst the equilibrium constant value is not affected,

(iv) Equilibrium constant for a reaction with negative ΔH value decreases as the temperature increases.

Answers (1)

Ans. (ii) The intensity of red colour increases when oxalic acid is added to a solution containing iron (III) nitrate and potassium thiocyanate.

Explanation: Oxalic Acid which is H_{2}C_{2}O_{4} reacts with the Fe^{3+} ions forming  a stable complexion that is [Fe(C_{2}O_{4})_{3}]^{3-}  thereby decreasing the concentration of free Fe^{3+}  ions and because of which concentration of  [Fe(SCN)]^{2+} decreases and thus the intensity of red colour decreases.

 

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