Given `DeltaH` for the process `Li(g)rarrLi^(+3)(g) + 3e^(-)` is `19800kJ//"mole" & IE_(1)` for `Li` is `520` then `IE_(2) & IE_(1)` of `Li^(+)` are respectively (approx value) :-

Options

A. `11775,7505`
B. `19280,520`
C. `11775,19280`
D. data insufficient

Answer

A

Explanation

`(1)/(lambda)=R_(H)((1)/(n_(1)^(2))-(1)/n_(2)^(2))implies R_(H)((n_(2)^(2)-n_(1)^(2))/(n_(1)^(2)n_(2)^(2)))`
`lambda=((n_(2)^(2)n_(1)^(2))/(n_(2)^(2)-n_(1)^(2)))`
`1^(st)` line of lymen series `n_(2)=2, n_(1)=1`
`2^(nd)` line of lymen series `n_(2)=3,n_(1)=1`
`3^(rd)` line of series `n_(2)=4,n_(1)=1`