1.

A metal complex having the composition Cr (NH_(3))_(4)Cl_(2) Br has been isolated in two forms A and B. The form A reacts with AgNO_(3) to give a white precipitate readily soluble in dilute aqueous ammonia whereas B gives a pale yellow precipitate soluble in concentrated ammonia. The spin only value of the magnetic moment of the complex is

Answer»

`sqrt(3)` B.M.
`sqrt(8)` B.M.
`sqrt(15)` B.M.
Zero

Solution :As there are three unpaired ELECTRONS, spin magnetic moment `(MU)`
=`sqrt(N(n+2))` B.M.
`=sqrt(3xx5)` B.M. = `sqrt(15)`


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