1.

The formula of the oxide of an element M is M_(2)O_(3) The first four ionisation energies of the element M can be in the order

Answer»

120 KCAL ,2780 kcal,400 kcal and5098 k cal
210 kcal ,150 kcal ,370 kcal and 590 kcal
70 kcal ,100kcal ,105 kcal and 120 kcal
560 kcal , 410 kcal ,320 and 290 kcal

ANSWER :A:C, B:d , C:b , D:Fe , Df:a


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