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901.

Find the incorrect statement about EDTAA. It is anionic ligandB. It is a chelating ligandC. It is a flexidentate ligandD. Four coordinating sites are present in it

Answer» Correct Answer - D
Discussion
902.

A person having osteoporosis is suffering from lead poisoning. Ethlene diamine tetra acetic acid (EDTA) is administered for this condition. The best form of EDTA to be used for such administration is -A. EDTAB. tetrasodium saltC. disodium saltD. calcium dihydrogen salt

Answer» Correct Answer - D
Discussion
903.

EDTA has coordination numberA. 3B. 4C. 5D. 6

Answer» Correct Answer - D
Coordination number of the central atom or ion is determined by the number of sigma bonds formed by the ligand with the central atom or ion .
`therefore ` EDTA (Ethylene diaminetetraacetate ) has `CN =6`
`{:(""^(-)OOCH_(2)C" "CH_(2)COO^(-)),(" "" /"),( " "overset(..)N- CH_(2) -overset(..)N),(" /"" "),(""^(-)OOCH_(2)C" "CH_(2)COO^(-)),(" EDTA"):}`
Discussion
904.

Generally, a group of atoms can function as a ligand ifA. (a) They are positively charged ionsB. (b) They are free radicalsC. (c) They are either neutral molecules or negatively charged ionsD. (d) None of these

Answer» Correct Answer - C
Ligand must have the capacity to donate lone pair of electrons to form coordinate bond.
Discussion
905.

Coordination number of `Zn` in `ZnS` (zine blende) isA. (a) `6`B. (b) `4`C. (c) `8`D. (d) `12`

Answer» Correct Answer - B
`ZnS` structure shows the coordination number of `Zn` is `4`.
Discussion
906.

Which of the following has an optical isomer?A. `[Co(en)(NH_(3))_(2)]^(2+)`B. `[Co(H_(2)O)_(4)(en)]^(3+)`C. `[Co(en)_(2)(NH_(3))_(2)]^(3+)`D. `[Co(NH_(3))_(3)Cl]^(+)`

Answer» Correct Answer - C
Discussion
907.

In which of the following octahedral complexes of Co (at. no. 27), will the magnitude of `Delta_o` be the highest?A. `[Co(CN)_(6)]^(3-)`B. `[Co(C_(2) O_(4))_(3)]^(3-)`C. `[Co(H_(2)O)_(6)]^(3+)`D. `[Co(NH_(3))_(6)]^(3+)`

Answer» Correct Answer - A
CFSE ( crystal field splitting energy ) for octahedral complex , `Delta _(0) ` depands on the the strength of negative ligand . Spectrochemically, it has been found that the strength of splitting is as follows :
` CO gt underline ( CN^(-)) gt NO_(2)^(-) gt underline (NH_(3))gt py gt `
` NCS ^(-) H_(2) O gt O_(2) gt Ox^(2-) gt OH^(-) gt F^(-) gt `
` Cl ^(-) gt SCN^(-) gt S^(2-) gt Br^(-) gt I^(-)`
therefore , magnitude of ` Delta _(0) ` will be highest in case of ` [Co (CN)_(6) ]^(3-)`.
Discussion
908.

Arrage the following optical activity possible in (a) `[Co(H_(2)O)_(2)(NH_(3))_(3)CI]^(o+)` (b) `[Co(H_(2)O))_(4)CI_(2)]^(o+)]` (c ) `[Co(NH_(3))_(4)(NO_(2))CI]^(o+)` (d) `[Co(CN)_(5)NC]^(Θ)` .

Answer» Correct Answer - a
The complex (a) is of the type `[Ma_(2)b_(3)CI]^(n+-)` and hence shows optical isomerism other types do not show .
Discussion