Question

In Column I consider each process just before and just after it occurs. Initial system is isolated from all other bodies. Consider all product particles (even those having rest mass zero) in the system. Match the system in Column I with the result they produce in Column II

Answer 1

$A$ ${}_{92}^{238}U{\to }_{90}^{234}Th{+}_2^{4}He$

#Proton is conserved.

#Momentum is always conserved in absence of external force.

#Since reaction is spontaneous so mass is converted into energy.

#Charge is always conserved

So,$\left(A\right)\to \left(2\right),\left(3\right),\left(4\right)$

$B$ ${}_{92}^{238}U{\to }_{90}^{234}Th{+}_2^{4}He$

#Proton is conserved.

#Momentum is always conserved in absence of external force.

#Since reaction is spontaneous so mass is converted into energy.

#Charge is always conserved

So,$\left(B\right)\to \left(2\right),\left(3\right),\left(4\right)$

$C$ ${}_{92}^{238}U{\to }_{90}^{234}Th{+}_2^{4}He$

#Proton is conserved.

#Momentum is always conserved in absence of external force.

#Since reaction is spontaneous so mass is converted into energy.

#Charge is always conserved

So,$\left(C\right)\to \left(2\right),\left(3\right),\left(4\right)$

$D$ In ${\beta }^{-}$ decay proton increases by +1

Here, other atom is not given so $\left(2\right)$ will not be the answer.

So,$\left(D\right)\to \left(1\right),\left(3\right),\left(4\right)$