In the following equilibrium, Fe^3+ (yellow) + SCN(colorless) reacts with FeSCN^

ID: 1066244 • Letter: I

Question

In the following equilibrium,

Fe^3+ (yellow) + SCN(colorless) reacts with FeSCN^2+(red)

Adding AgNO3 to the test tube caused a lightening of the red color of the solution. This is due to:

A. Silver interacting with thiocyanate to form a precipitate

B. The nitrate anion interacting with iron to form FeNO3

C. Silver interactng with the iron (III) thiocyanate complex to form AgFeSCN^2+

D. Silver interacting with iron in a redox reaction

E. The nitrate anion interacting with thiocyanate to form a precipitate

Which choice is correct?

A. Silver interacting with thiocyanate to form a precipitate.

Ag+(aq) + SCN ------------> [AgSCN ]^+ (ppt)

Due to this reaction the colour of the solution is slowly fade away.

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