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Question

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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Solution

The correct option is C AgNO3 and Ag2O

AgNO3+NH4OHNH4NO3+AgOH

2AgOHAg2O+H2O

Ag2O+2NH4OH2[Ag(NH3)2]OH(Soluble)+3H2O

CH2OH|(CHOH4)|CHOGlucose+Ag2ONH4OH−−−−COOH|(CHOH4)|COOHGlucose+2Ag)(silvermirror)

Hence option C is correct.

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