The point group of \(\mathrm{CO_{3}^{2-}}\) is :
D3h
The carbonate ion is trigonal planar: carbon is sp2 hybridised and, through resonance, all three C–O bonds are identical (bond order 4/3) with O–C–O angles of 120°.
Symmetry elements: a C3 principal axis through C perpendicular to the plane; three C2 axes in the plane, each along a C–O bond; a horizontal mirror plane σh (the molecular plane); three vertical planes σv, each containing the C3 axis and one C–O bond; and an S3 improper axis.
A principal Cn axis with n perpendicular C2 axes and a σh defines the Dnh group; here n = 3, so the point group is D3h, the same as BF3 and NO3–.
C3h lacks the perpendicular C2 axes, and C3v (e.g. NH3) lacks both the C2 axes and σh, so neither describes the planar ion.
Therefore the carbonate ion belongs to D3h.
Hence, D3h.
Important Questions from Mixed Topic (MH-SET)
.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
Every OS has a ................ or .......... which primarily resides in the main memory of the computer to perform some of the basic functions of the OS.
(i) Kernel
(ii) Interface
(iii) Nucleus
(iv) Compiler
Codes:
Which of the following are referred to as low level language?
(i) Machine language
(ii) Assembly language
(iii) High level language
(iv) Natural language
Codes:
Match the following:
List I List II (a) New York Public Library (i) Shelv AR (b) Miami University Augmented Research Group (ii) Smart library (c) Oula University Library (iii) Wolf Walk (d) North Carolina State University (iv) Find the future Codes:
Which part of the QR code represents the encoded data?
