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The ionisation energy of hydrogen atom is 13.6 eV, the ionisation energy of a singly ionsed helium atom would be (a) 13.6 eV

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The ionisation energy of hydrogen atom is 13.6 eV, the ionisation energy of a singly ionsed helium atom would be 

(a) 13.6 eV 

(b) 27.2 eV 

(c) 6.8 eV 

(d) 54.4 eV

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(d) 54.4 eV

\(E^1_2\) = (2)2 E1 = 4 x 13.6 = 54.4 eV.

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