Colour of compounds occurs due to phenomenon of polarisation, charge transfer, d-d transition and H.O.M.O.-L.U.M.O. transition. Most of the transition metal complex compound are coloured either due to

Question

Colour of compounds occurs due to phenomenon of polarisation, charge transfer, 
d-d transition and H.O.M.O.-L.U.M.O. transition. Most of the transition metal 
complex compound are coloured either due to d-d electron transition or charge 
transfer and ionic compounds are coloured due to polarisation of anion.

Prashant Kotian · Accepted Answer

Correct answer: B. Step 1: Understand that the potential energy of a bonding system reaches a minimum at the optimum internuclear distance (bond length), balancing attractions and repulsions. Step 2: If the internuclear distance is decreased below this optimum distance, the nuclei and core electron clouds are forced too close together. Step 3: This leads to a massive, steep increase in potential energy due to the sharp increase in electrostatic repulsions between the positively charged nuclei and between the negatively charged electron clouds.

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