Consider the following reaction
Nitrite + acetic acid + thiourea $⟶ N_{2} + {S C N}^{-} + {2 H}_{2} O$
Formation of the product in the above reaction can be identified by :

{F e C l}_{3}

/dil.

H C l

when blood red colour appears

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{F e C l}_{3}

/dil.

H C l

when blue colour appears

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K_{2} {C r}_{2} O_{7}

H C l

when green colour appears

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{K M n O}_{4}

H C l

whne colourless solution is formed

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Solution

The correct option is A ${F e C l}_{3}$ /dil. $H C l$ when blood red colour appears
Fe(III) ion gives a blood red colouration with thiocyanate ions.
$F e C l_{3} + 3 N H_{4} S C N \to F e (S C N)_{3} r e d c o l o u r + 3 N H_{4} C l$

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H_{2} S

H C l

What is the colour change observed in dil. HCl solution when phenolphthalein is added to it?

H C l

N i t r i t e + a c e t i c a c i d + t h i o u r e a ⟶ N_{2} + S C N^{-} + 2 H_{2} O

H C l o r F e C l_{3}

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