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 catalyst the equilibrium constant value is not affected.
(iv) Equilibrium constant for a reaction with negative ?H value decreases as the temperature increases.
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 catalyst the equilibrium constant value is not affected.
(iv) Equilibrium constant for a reaction with negative ?H value decreases as the temperature increases.
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1 Answer
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This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: option (ii)
The intensity of red colour increases when oxalic acid is added to a solution containing iron (III) nitrate and potassium thiocyanate.
Iron (III) nitrate and potassium thiocyanate react to give deep red coloration.
The reaction is:
Fe3 + aq + SCN−↔ [FeSCN]2 + aq
yellow deep red
Now, to this solution, if oxalic acid (H2C2O4) is added, then it reacts with Fe3+ ions to form the stable complex ion [Fe (C2O4)3]3−, thus decreasing the concentration of Fe3+ ions. In accordance with the Le-Chatelier's princi...more
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