JEE Main 2021 — Structure Of Atom Question with Solution
From: JEE Main 2021 (Online) 25th February Evening Shift
Question
Electromagnetic radiation of wavelength 663 nm is just sufficient to ionise the atom of metal A. The ionization enegy of metal A in kJ mol1 is __________. (Rounded off to the nearest integer)
[h = 6.63 1034 Js, c = 3.00 108 ms1, NA = 6.02 1023 mol1]
[h = 6.63 1034 Js, c = 3.00 108 ms1, NA = 6.02 1023 mol1]
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Show full solutionCorrect answer: 180.6
Correct answer
180.6
Step-by-step explanation
Energy of EMR = IE of the metal (A)
atom1 mol1
J mol1 [ = 663 nm = 663 109 m]
= 180600 J mol1 = 180.6 kJ mol1 181 kJ mol1
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