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Q.

The ionization enthalpy of hydrogen atom is  1.312  ×  106  J mol−1. The energy required to excite the electron in the atom from n = 1 to n = 2 is

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a

8.51  ×  105  J mol−1

b

6.56  ×  105  J mol−1

c

7.56  ×  105  J mol−1

d

9.84  ×  105  J mol−1

answer is D.

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Detailed Solution

En=-E1n2ΔE=E2−E1=-E122 + E112       =−1.312  ×  10622 +1.312 ×  106       =9.84  ×  105  J  mol−1
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The ionization enthalpy of hydrogen atom is  1.312  ×  106  J mol−1. The energy required to excite the electron in the atom from n = 1 to n = 2 is