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The ionisation enthalpy of He^(+) ion is...

The ionisation enthalpy of `He^(+)` ion is `19.60 xx 10^(-18)` J atom`""^(-1)`. The ionisation enthalpy of Li`""^(2+)` ion will be

A

`84.2 xx 10^(-18) "J atom"^(-1)`

B

`44.10 xx 10^(-18)"J atom"^(-1)`

C

`63.20 xx 10^(-18) "J atom"^(-1)`

D

`21.20 xx 10^(-18) "J atom"^(-1)`

Text Solution

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The correct Answer is:
B
Ionisation enthalpy of `Li^(2+) = (9)/(4) xx` ionisation enthalpy of `He^(+)`
`= (9)/(4) xx 19.60 xx 10^(-18)`
`= 44.1 xx 10^(-18) "J atom"^(-1)`
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