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When an atom undergoes $β^{+}$ decay,

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a neutron changes into proton

a proton changes into neutron

a neutron changes into an antiproton

a proton changes into an antineutron

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Correct option is B

A nucleus contains protons and neutrons with no antiprotons and antineutrons. Hence answer can be either (b) or (d). Due to conservation of spin answer is (b)

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When an atom undergoes β+decay,

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When an atom undergoes $β^{+}$ decay,