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).

How many of given statements are true for lanthanums? 1. The common o

1.	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).
Answer» Solution :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.