WBJEE 2021 Physics and Chemistry Solved Paper

CATEGORY - II (Q71 to Q75)

Carry 2 marks each and only one option is correct. In case of incorrect answer or any combination of more than one answer, ½ mark will be deducted.

Question : 74 of 80

Marks: +1, -0

5.75 mg of sodium vapour is converted to sodium ion. If the ionisation energy of sodium is 490 kJ mol‌–1 and atomic weight is 23 units, the amount of energy needed for this conversion will be

1.96 kJ
1960 kJ
122.5 kJ
0.1225 kJ

Validate

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