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:
A
Cs(NO3) and CsOH
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B
Zn(NO3)2 and ZnO
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C
AgNO3 and Ag2O
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D
Mg(NO3)2 and Mg(OH)2
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