Successive ionization energies of an element X are 737.7 kJ/mole, 1450.7 kJ/mole, 10,500 kJ/mole respectively. What is the formula of the compound formed when it combines with a non-metal Y which has maximum number of unpaired electrons?
A
XY2
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B
X2Y3
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C
X3Y2
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D
X2Y
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Solution
The correct option is CX3Y2 The third IE is very high as compared to second IE. Thus the element achieves inert gas configuration after losing 2 electrons. Thus its valency is 2. Y is non metallic and has maximum unpaired electrons, thus its valency is 3. Hence X and Y from the compound X3Y2