Question

The following reaction is at equilibrium,

$40.5$ $K_{c}$

$N_{2}$

In the above reaction, colour intensity of red colour can be increased by

• A. Addition of KSCN
• B. Addition of oxalic acid which reacts with $3H_{2}$ ions
• C. Addition of $2N_{2} + 6H_{2}$ions which react with $4NH_{3}$ions
• D. Red colour intensity cannot be changed.

Answer 1

Answer: (A)

Addition of KSCN

Answer 2

: Addition of KSCN increases the colour intensity of the solution as it shifts the equilibrium to right. Addition of reagents like oxalic acid or $Hg^{2 +}$ions which remove $Fe^{3 +}$ or $SCN^{-}$ ions shifts the equilibrium to the left and colour intensity decreases.