Q29 of 70 Page 109

Transition elements form binary compounds with halogens. Which of the following elements will form MF3 type compounds?

Cr and Co form compounds of the form MF3. Fluorine stabilizes CoF3 due to high lattice energy and CrF3 due to high bond enthalpy.

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Which of the following lanthanoids show +2 oxidation state besides the characteristic oxidation state +3 of lanthanoids?

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Which of the following ions show higher spin only magnetic moment value?

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Which of the following will not act as oxidising agents?

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Although +3 is the characteristic oxidation state for lanthanoids but cerium also shows +4 oxidation state because ___________.