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-$I$	List-$II$
$(a)$ Chlorophyll	$(i)$ Ruthenium
$(b)$ Vitamin-$B_{12}$	$(ii)$ Platinum
$(c)$ Anticancer drug	$(iii)$ Cobalt
$(d)$ Grubbs catalyst	$(iv)$ Magnesium

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Match List-$I$ with List-$II$.

List-$I$ List-$II$

$(a)$ Chlorophyll $(i)$ Ruthenium

$(b)$ Vitamin-$B_{12}$ $(ii)$ Platinum

$(c)$ Anticancer drug $(iii)$ Cobalt

$(d)$ Grubbs catalyst $(iv)$ Magnesium

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