1.

The compound CsAuCl_3 is found to be diamagnetic. Gold (Au) in this compound is in (there could be a covalent bond between two gold atoms)

Answer»

AU oxidation state only
Au(II) oxidation state only
Au(I) and Au(III) oxidation states
None of these

Solution :Au(Z=79), `[XE]^(54) 4F^(14) 5d^(10) 6s^(1)`. As `CsAuCl_(3)` is diamagnetic . It could not CONSIST of simple (Au(II)) ions because Au(II) has an oddnumber of electrons. Similarly, Au(0) is alos ruled out. Calculation of oxidation state of Au indicates that it can either be Au(II) or an equimolar mixture of Au(I) and (III). therefore, correct answer is C. the actual structure consists of an equal number of `[AuCl_(2)]^(-)` ions and `[AlCl_(4)]^(-)` ions each balanced by `Cs^(+)` ion.


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