1.

If M is the element of actinoid series, the degree of complex formation decreases in the order

Answer»

`M^(4+) GT M^(3+) gt MO_(2)^(2+) gt MO_(2)^(+)`
`MO_(2)^(+) gt MO_(2)^(2+) gt M^(3+) gt M^(4+)`
`M^(4+) gt MO_(2)^(+) gt M^(3+) gt MO_(2)^(+)`
`MO_(2)^(3+) gt MO_(2)^(+) gt M^(4+) gt M^(3+)`

ANSWER :B


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