31. Assertion: Whwn Iron-III Nitrate is mixed in potasium thiocyanate red colour appears and intensity of red colour decreases when oxalic acid is mixed. Reason: Solubility product of iorn thiocynate decreases due to presence of H+ ions

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F e^{3 +}

ions in an aq. solution gives deep red colouration with both sodium acetate (in excess) and ammonium thiocyanate (slightly acidic).
The deep red colouration obtained with ammonium thiocyanate gets decolourised on addition of solution containing

F^{-}

ions.
The deep Red colouration is due to the formation of :

F e^{3 +}

ions in an aq. solution gives deep red colouration with both sodium acetate (in excess) and ammonium thiocyanate (slightly acidic). The deep red colouration obtained with ammonium thiocyanate gets decolourised on addition of solution containing

F^{-}

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N H_{4} S C N

Tomatoes appear red in colour due to the presence of the pigment lycopene but at the early stage of a tomato ,it appears green in colour. How does the tomato get its red colour when it is ripe ?

F e^{3 +}

ions in an aqueous solution gives deep red colouration with both sodium acetate (in excess) and ammonium thiocyanate (slightly acidic). The deep red colouration obtained with ammonium thiocyanate gets decolourised on addition of solution containing

F^{-}

ions. Excess of

C H_{3} C O O N a

is added in the reaction with

F e^{3 +}

because :

Q. When green and red colours are mixed, the colour produced is :

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