I1, I2, I3 of an element are 176, 346 and 1850K.cals respectively. The molecular formula of its phosphate is

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M3PO4

MPO4

M2(PO4)3

M3(PO4)2

answer is D.

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Detailed Solution

Sudden jump in IP3 value indicates that the element is bivalent.Formula of metal phosphate is M+2 (PO4)-3 -------M3(PO4)2

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