Nature has chosen Zn(ll) ion at the active site of many-hydrolytic enzymes because
A. Zn(II) is a poor Lewis acid
B. Zn(ll) does not have chemically accessible redox states
C. Zn(ll) forms both four and higher coordination complexes
D. Zn(ll) forms weak complexes with oxygen donor ligands
Answer: Option D
This Question Belongs to Engineering Chemistry >> Transition Elements
A. Lu3+, Yb3+, Dy3+, Eu3+
B. Eu3+, Dy3+, Yb3+, Lu3+
C. Dy3+, Yb3+, Eu3+, Lu3+
D. Yb3+, Dy3+, Lu3+ , Eu3+
A. D4h and (C2v and C2h)
B. Td and (C2v and D4h)
C. D4h and (C2v and D4h)
D. Td and (C2v and C4v)
The complex that exists as a pair of enantiomers is
A. trans-[CO(H2NCH2CH2NH2)2Cl2]+
B. cis-[Co(NH3)4Cl2]+
C. [Pt(PPh3)(Cl)(Br)(CH3)]-
D. [Co(H2NCH2CH2NH2)3]3+
The complex formed in the brown ring test for nitrates is
A. [Fe(H2O)5NO]3+
B. [Fe(H2O)5NO]2+
C. [Fe(H2O)4(NO)]2+
D. [Fe(H2O)4(NO)]3+
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