Question:

When Uranium is bombarded with neutrons, it undergoes fission. The fission reaction can be written as :
\({}_{92}\mathrm{U}^{235} + {}_{0}n^{1} \rightarrow {}_{56}\mathrm{Ba}^{141} + {}_{36}\mathrm{Kr}^{92} + 3x + Q\) (energy) where three particles named \(x\) are produced and energy Q is released. What is the name of the particle \(x\) ?

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Balance mass number and atomic number on both sides to find the mass number and charge of x.
Updated On: Oct 31, 2026
  • electron
  • \(\alpha\)-particle
  • neutron
  • neutrino
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The Correct Option is C

Solution and Explanation

Mass number: LHS \(= 235 + 1 = 236\). RHS \(= 141 + 92 + 3A = 233 + 3A\). So \(3A = 3\Rightarrow A = 1\).
Atomic number: LHS \(= 92 + 0 = 92\). RHS \(= 56 + 36 + 3Z = 92 + 3Z\). So \(Z = 0\).
A particle with A = 1 and Z = 0 is a neutron, \({}_0n^1\).
Answer: (3) neutron
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