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  • How can red colour in following equilibrium be increased? <img alt="Fe^{3+}\left ( aq \right )+SCN^{-}\left ( aq \right )\rightleftharpoons \left [ Fe\left ( SCN \right ) \right ]^{2+}\le

How can red colour in following equilibrium be increased?

Fe^{3+}\left ( aq \right )+SCN^{-}\left ( aq \right )\rightleftharpoons \left [ Fe\left ( SCN \right ) \right ]^{2+}\left ( aq \right )

 

Option: 1

By adding H_{2}C_{2}O_{4}
 


Option: 2

By adding potassium thiocyanate
 


Option: 3

By adding aq. HgCl_{2}
 


Option: 4

Both (1) and (2)


Answers (1)

best_answer

Answer (3)

\\Fe^{3+}\left ( aq \right )+SCN^{-}\left ( aq \right )\rightleftharpoons \left [ Fe\left ( SCN \right ) \right ]^{2+}\left ( aq \right )\\\; \; \; Yellow\; \; \; \; \; \; \; \; \; \; Colourless\; \; \; \; \; \; \; \; \; deep \; red

Addition of Effect
(1) H_{2}C_{2}O_{4} Fe^{3+}is removed as \left [ Fe\left ( C_{2}O_{4} \right )_{3} \right ]^{3-}
(2) Potassium thiocyanate (KSCN) More SCN^{-}
(3) aq.\; HgCl_{2} SCN^{-} is removed as \left [ Hg\left ( SCN \right )_{4} \right ]^{2-}

 

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