Q.

Consider the  equilibrium reaction.Feaq3+yellow+SCNaq−colourless⇌FeSCNaq2+Deep red  . Find the correct statement from the following.

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a

Addition of aq ⋅H2C2O4 increases the intensity of red colour.

b

Addition of aq .KSCN decreases the intensity of red colour.

c

Addition of aq ⋅HgCl2 decreases the intensity of red colour.

d

Addition ofaq .FeCl3 decreases the intensity of red colour.

answer is C.

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Detailed Solution

H2C2O4 forms complex FeC2O433− with free Fe3+ there by shifts the  equilibrium to left. Addition of KSCN shifts the equilibrium to right.HgCl2 forms a complex HgSCN42−with free SCN-there by shifts the equilibrium to left. Addition of FeCl3shifts the equilibrium to right.
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Consider the  equilibrium reaction.Feaq3+yellow+SCNaq−colourless⇌FeSCNaq2+Deep red  . Find the correct statement from the following.