MCQ Solution: D and F Block Elements
Aqueous solution of a metallic nitrate X reacts with NH4OH to form Y which dissolves in excess NH4OH. The resulting complex is reduced by acetaldehyde to deposit the metal. X and Y, respectively, are:
1) Cs(NO3) and CsOH
2) Zn(NO3)2 and ZnO
3) AgNO3 and Ag2O
4) Mg(NO3) and Mg(OH)2
Solution
$$AgNO_3+NH_4OH\rightarrow NH_4NO_3+AgOH$$
$$2AgOH\rightarrow Ag_2O+H_2O$$
$$Ag_2O+2NH_4OH\rightarrow \underset{(Soluble)}{2[Ag(NH_3)_2]OH}+3H_2O$$
$$\overset{\overset{CH_2OH}{|}}{\underset{Glucos}{\underset{CHO}{\underset{|}{(CHOH_4)}}}}+Ag_2O \xrightarrow[]{NH_4OH}$$$$\overset{\overset{COOH}{|}}{\underset{Glucos}{\underset{COOH}{\underset{|}{(CHOH_4)}}}}+\underset{(silver\,mirror}{2Ag)}$$
$$AgNO_3+NH_4OH\rightarrow NH_4NO_3+AgOH$$
$$2AgOH\rightarrow Ag_2O+H_2O$$
$$Ag_2O+2NH_4OH\rightarrow \underset{(Soluble)}{2[Ag(NH_3)_2]OH}+3H_2O$$
$$\overset{\overset{CH_2OH}{|}}{\underset{Glucos}{\underset{CHO}{\underset{|}{(CHOH_4)}}}}+Ag_2O \xrightarrow[]{NH_4OH}$$$$\overset{\overset{COOH}{|}}{\underset{Glucos}{\underset{COOH}{\underset{|}{(CHOH_4)}}}}+\underset{(silver\,mirror}{2Ag)}$$
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