eng Ansari Education and Research Society Journal of Ultra Scientist of Physical Sciences April 2021 33 4 30 41 http://dx.doi.org/10.22147/jusps-A/330401 1543 article V.R. KULLI 1 B. CHALUVARAJU 2 T.V. ASHA 2 Department of Mathematics Gulbarga University, Gulbarga 585106 (India) Department of Mathematics, Bangalore University, Jnana Bharathi Campus, Bangalore-560 056 (India) <p>Chemical graph theory is a branch of graph theory whose focus of interest is to finding topological indices of chemical graphs which correlate well with chemical properties of the chemical molecules. In this paper, we compute the Nirmala index, first and second inverse Nirmala indices for some chemical networks like silicate networks, chain silicate networks, hexagonal networks, oxide networks and honeycomb networks along with their comparative analysis.</p> https://www.ultrascientist.org/paper/1543/ Nirmala index first and second inverse Nirmala indices, chemical networks. Mathematics Subject Classification: 05C09, 05C92, 92E10.