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Standard XII
Chemistry
Question

92X238⟶A+2He4
The number of neutrons in element 'A' will be-
  1. 146
  2. 148
  3. 242
  4. 144

A
146
B
242
C
144
D
148
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Solution
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The correct option is D 144
No.of Neutrons = atomic mass -atomic number
No.of Neutrons in X is =238−92
=146.
No.of Neutrons in A is=146− no. of neutrons in He.
= 146- (4-2)
=146−2
=144.
So number of neutrons in A is 144.
So answer is D.

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