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The ionization enthalpy of hydrogen atom is $1.312 \times 10^6 Jmol^{-1}$. The energy required to excite the electron in the atom from n = 1 to n = 2 is


( A ) $6.56 \times10^5 Jmol^{-1}$
( B ) $8.51\times 10^5 Jmol^{-1}$
( C ) $7.56\times10^5 Jmol^{-1}$
( D ) $9.84\times 10^5 Jmol^{-1}$

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