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Assertion: A photon of energy 12 eV can break three molecules of A2 into atoms which has bond dissociation energy of 4 e V/molecule.
Reason : Total energy is conserved and interaction is always one to one between photon and molecule.

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Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are true but (R) is not the correct explanation of (A)

(A) is true but (R) is false

Both (A) and (R) are false

answer is D.

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Detailed Solution

A photon with an energy of $12 eV$ can only split one molecule of $A_{2}$ into atoms because the interaction between a photon and a molecule is always one to one. The remaining $8 eV$ energy becomes the kinetic energy of the atoms.

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