Consider the following statements, (I) La`(OH)_(3)` is the least basic – InterviewSolution

InterviewSolution

1.	Consider the following statements, (I) La`(OH)_(3)` is the least basic among hydroxides of lanthanides. (II) `Zr^(4+) and Hf^(4+)` possess almost the same ionic radii (III) `Ce^(4+)` can act as an oxidising agent. Which of the above is/are true?A. I and IIIB. II and IIIC. Only IID. I and II
Answer» Correct Answer - B The basic character of hydroxide decreases from `La(OH)_(3) to Lu(OH)_(3)`.Due to smaller size of Lu, the Lu-OH bond attains more covalent character while `Zr^(4+) and Hf(4+)` has same ionic radii and `Ce^(4+)` is an oxidising agent.

Discussion

No Comment Found

Related InterviewSolutions

Lanthanide series start from the elements with atomic numberA. 27 to 71B. 58 to 71C. 56 to 70D. 60 to 74
The correct order of ionic radii of `Y^(3+), La ^(3+), Eu ^(3+) and Lu ^(3+)` isA. `Y^(3+) lt Lu ^(3+) lt Eu ^(3+) lt La ^(3+)`B. `La ^(3+) lt Eu ^(3+) lt Lu ^(3+) lt Y^(3+)`C. `Lu ^(3+), lt Eu ^(3+) lt La ^(3+) lt Y ^(3+)`D. `Y ^(3+) lt La ^(3+)lt Lu ^(3+) lt Eu^(3+)`
Lanthanide contraction is due to increase inA. iionic radiiB. shielding of 4f electronsC. effective nuclear chargeD. size of 4f orbitals
Lanthanide contraction is related toA. valence electronB. ionic radiiC. densitiesD. nuclear mass of various membere of the series
The steady decrease in atomic size in lanthanide series is called lanthanide confraction and in all amounts toA. 150 PmB. `10 Pm`C. `20 Pm`D. `40 Pm`
Lanthanide contraction is due to increase inA. shielding of 4f electronsB. effective nuclear chargeC. atomic numberD. size of 4f orbital
Lanthanide contraction due toA. poor shielding of 5f orbitalsB. poor shielding of 3f orbitalsC. prerfect shielding of 4f orbitalsD. poor shielding of 4f orbitals
The lanthanide contraction is responsible for the fact thatA. Zr and Yb have same sizeB. Zr and Nb have same oxidation sateC. Zr and Hf have same radiusD. Zr and Zn have same oxidation state
The most characteristic oxidation state of lanthanide isA. `+2`B. `+3`C. `+4`D. `+6`
Name a member of lanthanide series which is well known to exhibit `+4` oxidation state `,`A. CeB. LaC. LuD. Pr