Question

Slow neutrons can bring about the fission of :

• A. ${}_{92}{U}^{235}$
• B. ${}_{82}{U}^{238}$
• C. ${}_{82}P{b}^{207}$
• D. ${}_{88}{U}^{226}$

Answer 1

The correct option is A ${}_{92}{U}^{235}$

Slow neutrons bring fission in U-235.
${}_{92}^{235}U{+}_0^{1}n{\to }_{54}^{142}Xe{+}_{38}^{90}Sr+4_0^{1}n+energy$
${}_{92}^{235}U{+}_0^{1}n{\to }_{56}^{141}Ba{+}_{36}^{94}Kr+3_0^{1}n+energy$
${}_{92}^{235}U{+}_0^{1}n{\to }_{55}^{144}Cs{+}_{37}^{90}Rb+2_0^{1}n+energy$