Coordination CompoundHard

Question

Which of the following polymerisation isomers of the compound having empirical formula [Cr(NH3)3(NO2)3] has the lowest molecular mass?

Options

A.[Cr(NH3)4(NO2)2]+ [Cr(NH3)2(NO2)4]-
B.[Cr(NH3)6]3+[Cr(NO2)6]3-
C.[Cr(NH3)5(NO2)]2+[Cr(NH3)(NO2)5]2-
D.All

Solution

Polymerisation isomers of the compounds are a special case of coordination isomerism, in which the various isomers differ in formula weight from one another. As all have two chromium ions (+3), six ammonia molecules and  six NO2- ions, they will have same molecular masses.

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