How many of given statements are true for lanthanums ?
(1) The common oxidation state of all lanthanides is +3.
(2) All lantanides belongs to group III of modern periodic table.
(3) All lanthanides belongs to seventh period of periodic table.
(4) The radius for all lanthanides cations(M +3 ) decrease from Ce +3 to Lu +3 .
(5) The basic character of hydroxide increases on moving from Ce(OH) 3 to Lu(OH) 3 .
(6) All lanthanides are metals.
(7) The reducing power of lanthanides decreases from Ce to Lu.
(8) Lanthanides reacts with cold water to liberate H 2 .
Text Solution
Verified by ExpertsA
6
Sol. (1) All lanthanides exhibits +3 O.N. but few also exhibit +2 and +4 O.N.
(2) Correct
(3) Incorrect as all belongs to 6 th period.
(4) True due to lanthanide contraction.
(5) Incorrect as basicing decreases from Ce(OH) 3 to Lu(OH) 3 becomes of fazans rule.
(6) Correct
(7) Correct
(8) All lanthanides have –ve S.R.P. hence all releases hydrogen.
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