Question

Which of the following statements is incorrect?
(a) In equilibrium mixture of ice and water kept in perfectly
insulated flask, mass of ice 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 DH
value decreases as the temperature increases.

Answer 1

Answer:

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

Explanation:

(b)Fe3++SCN– ⇌ FeSCN2+(Red)

When oxalic acid is added to a solution containing iron nitrate and potassium thiocyanate, oxalic acid reacts with Fe3+ ions to form a stable complex ion [Fe(C2O4)3]3-, thus, decreasing the concentration of free Fe3+ ions which in mm decreases the intensity of red colour.

Fe3+ + SCN–⇌ [Fe(SCN)]2+ (Red).

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Answer 2

Hello Friend..!!

The answer of ur question is ...!!

Option.B

Thank you..!!