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Q65) Oxidation state of the metal ion in the complex [fe(CN)6]3- is [ AMU 1997]




SOLUTION


Answer: (a)


Q66) Which one of the following shows maximum paramagnetic character?




SOLUTION

Only Cr have three unpaired electrons hence paramagnetic
Answer: (a)


Q67) in which of the following compound transition metal has zero oxidation state? [ CBSE PMT 1999]



SOLUTION

fe oxidation state is zero as Co is neutral molecule
Answer:(d)



Q68) The complex ion which has no 'd' electrons in the central metal atom is (At No Cr=24, Mn=25, Fe=26, Co=27] [ IIT screening test 2001]



SOLUTION

Oxidation number of Mn in [MnO4]- is +7 which is achived bu losing all 3d5 and 4s2 electrons
Answer: (a)


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