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A free neutron decays into a proton but a free proton does not decay into neutron. This is because

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neutron is a composite particle made of a proton and an electron

neutron has larger rest mass than proton

proton is a charged particle

neutron is an uncharged particle

answer is D.

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Detailed Solution

A neutron decays into proton, electron and antineutrino and this decay is possible only because neutron has a slightly larger rest mass when compared to a proton.

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