1.

A neuclear transformation is denoted by `X (n,a) _(3)^(7)Li` Which of the following is the neucleus of electron X?A. `._(6)^(12)C`B. `._(5)^(10)B`C. `._(5)^(9)B`D. `._(4)^(11)Be`

Answer» Correct Answer - B
`._(Z)^(A)X+._(0)^(1)n rarr ._(3)^(7)Li+._(2)^(4)He`
It implies that
`A+1=7+4 rArr A=10`
and `Z +0=3+2 rArr Z =5`
Thus, it is Boron `._(5)^(10) B`


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