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What is the energy required to raise a molecule to a higher energy level?

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What is the energy required to raise a molecule to a higher energy level?

(a) Quantum

(b) Exothermic energy

(c) Work done

(d) None of the mentioned

This question was addressed to me during an online interview.

My question comes from Halogenation in portion Halogenation of Unit Processes

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Right option is (a) Quantum

The explanation is: The amount of energy required to raise a molecule to a higher energy level is called a quantum. One of the factors that make up a quantum is a true energy value given i.e. ergs and called Planck’s constant, but the formula for a quantum =    h X constant/wavelength ( cm ).

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