Which of the following reactions led to the discovery of neutrons?
A
6C14+1p1→7N14+0n1
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B
4Be9+2He4→6C12+0n1
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C
5B11+1D2→6C11+0n1
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D
4Be8+2He4→6C11+0n1
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Solution
The correct option is C4Be9+2He4→6C12+0n1 Rutherford suggested that in an atom, there must be present the third type of fundamental particle which is electrically neutral and he proposed the name, neutron.
Chadwick bombarded Be with α - particles. The reaction which led to discovery of neutrons is as follows: