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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
s Block Elements

NTA Abhyas 2020 · Chemistry · s Block Elements

The ionization energies of Li and Na are 520kJmol^ - 1 and 495kJ...

The ionization energies of Li\text{Li} and Na\text{Na} are 520kJmol−1\text{520}\text{kJ}mol^{- 1} and \text{495}\text{kJ}{\text{mol}^{- 1} respectively. The energy required to convert all the atoms present in 7mg\text{7}\text{mg} of Li\text{Li} vapours and 23mg\text{23}\text{mg} of sodium vapours to their respective gaseous cations respectively are:

Options

  1. A52 J, 49.5 J
  2. B520 J, 495 J
  3. C49.5 J, 52 J
  4. D495 J, 520 J

Correct answer

B. 520 J, 495 J

Step-by-step solution

For 1 mole Li i.e. 7 g will absorb 520 kJ heat
So for 7 mg lithium heat absorbed will be 520 J
Similarly for sodium
1 mole Na i.e. 23 g will absorb 495 kJ Heat
So for 23 mg sodium heat absorbed will be 520 J
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