Iron salt used in blue prints is:

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(B) The process of blueprinting involves the use of light-sensitive iron salts. Specifically,ferric ammonium oxalate or ferric oxalate,$Fe_2(C_2O_4)_3

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$Fe_2(C_2O_4)_3$

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(B) The process of blueprinting involves the use of light-sensitive iron salts. Specifically,ferric ammonium oxalate or ferric oxalate,$Fe_2(C_2O_4)_3$,is used as the light-sensitive component. When exposed to light,the $Fe^{3+}$ ions are reduced to $Fe^{2+}$ ions,which then react with potassium ferricyanide to form a deep blue pigment known as Prussian blue,$Fe_4[Fe(CN)_6]_3$. Therefore,the iron salt used in blue prints is $Fe_2(C_2O_4)_3$.

List-$I$ (Compound)	List-$II$ (Colour)
$A$. $Fe_4[Fe(CN)_6]_3 \cdot xH_2O$	$I$. Violet
$B$. $[Fe(CN)_5NOS]^{4-}$	$II$. Blood Red
$C$. $[Fe(SCN)]^{2+}$	$III$. Prussian Blue
$D$. $(NH_4)_3PO_4 \cdot 12MoO_3$	$IV$. Yellow

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