KEAM 2013 Physics and Chemistry Paper

Question : 103 of 120

Marks: +1, -0

The colour of the solution/precipitate obtained in the elemental analysis of an organic compound and the molecule/ion responsible for the colour are given below. Choose the incorrectly matched pair

Prussian blue - Fe4[Fe(CN)6.‌x‌H2‌O]
Black - pbS
Violet colour - [Fe(CN)5‌NOS]4−
Blood red colour - [Fe(SCN)]2+
Yellow - (NH4)2MoO4

Validate

Element	Colour of solution/precipitate	Molecule ion formed
N	Prussian blue	Fe4[Fe(CN)6]3⋅XH2O
S	black	PbS
S	violet colour	[Fe(CN)5NOS]4
N and S	blood red colour	[Fe(SCN)]2+
P	yellow	(NH4)3PO4⋅12MoO3

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