Given reasons for the following features of transition meatal chemistr – InterviewSolution

InterviewSolution

1.	Given reasons for the following features of transition meatal chemistry `:` (i) The lowest oxide of a transition metal ( say, chromium , atomic number 24 ) is basic whereas the highest oxide is usualy acidic. (ii) Transition metals sometimes exhibit very low oxidation states such as `+1` and 0.
Answer» (i) Lowest oxide of Cr is CrO which is basic. The highest oxide is `CrO_(3)` which is acidic. ( In between `Cr_(2)O_(3)` is amphoteric ). Higher the oxidation state of the metal, more easily it can accept electron and hence greater is the acidic character. (ii) ` + 1` oxidation state is shown by Cu because after loss of one electron, it acqires stable configuration of`3s^(10)`. Zero oxidation state is shown in forming metal carbonyls, e.g., `Ni(CO)_(4)` because`pi-` electrons donated by the ligands are accepted into the empty d orbitals.

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