Other than the X-ray difference , how could be the following pairs of isomers be distinguished from one another by : `[Cr(NH_(3))_(6)][Cr(NO_(2))_(6)] and [Cr(NH_(3))_(4)(NO_(2))_(2)][Cr(NH_(3))_(2)(NO_(2))_(4)]`A. cryoscopic methodB. measurement of molar conductanceC. measuring magnetic momentD. observing their colours.

Other than the X-ray difference , how could be the following pairs of

1.	Other than the X-ray difference , how could be the following pairs of isomers be distinguished from one another by : `[Cr(NH_(3))_(6)][Cr(NO_(2))_(6)] and [Cr(NH_(3))_(4)(NO_(2))_(2)][Cr(NH_(3))_(2)(NO_(2))_(4)]`A. cryoscopic methodB. measurement of molar conductanceC. measuring magnetic momentD. observing their colours.
Answer» Correct Answer - B (1) `[Cr(NH_(3))_(6)]^(3+) [Cr(NO_(2))_(6)]^(3-) and [Cr(NH_(3))_(4)(NO_(2))_(2)]^(+)[Cr(NH_(3))_(2)(NO_(2))_(4)]^(-)` have same number of ions, so cryoscopic method can not be used. (2) Molar conductance depends on the number of ions as well as on the charge on the complexes. `[Cr(NH_(3))_(6)]^(3+) [Cr(NO_(2))_(6)]^(3-) and [Cr(NH_(3))_(4)(NO_(2))_(2)]^(+)[Cr(NH_(3))_(2)(NO_(2))_(4)]^(-)` have same number of ions but different electrical charges. (3) Both complexes have same number of unpaired electrons, so mesuring magntic moments methods can not be used. (4) They have similar colour because of the similar conditions.

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