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Question
Which of the following statements is incorrect?
Options
In equilibrium mixture of ice and water kept in perfectly insulated flask mass of ice and water does not change with time.
The intensity of red colour increases when oxalic acid is added to a solution containing iron (III) nitrate and potassium thiocyanate.
On addition of catalyst the equilibrium constant value is not affected.
Equilibrium constant for a reaction with negative ∆H value decreases as the temperature increases.
Solution
The intensity of red colour increases when oxalic acid is added to a solution containing iron (III) nitrate and potassium thiocyanate.
Explanation:
\[\ce{Fe^{3+} + SCN– ⇌ \underset{(Red)}{FeSCN^{2+}}}\]
When oxalic acid is added to a solution containing iron nitrate and potassium thiocyanate, oxalic acid reacts with \[\ce{Fe^{3+}}\] ions to form a stable complexion \[\ce{[Fe(C2O4)3]^{3-}}\], thus, decreasing the concentration of free Fe3+ ions which in mm decreases the intensity of red colour.
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