Question

A,B,C are 3 elements forming apart of compound in oxidation states of 2,5,-2.what could bethe compound

Answer 1

Putting values of O.S. of A, B and C in all the given compounds , the compound giving sum of O.S. as zero will be the real compound. For A3(BC4)2A3(BC4)2

(+2)×3+2×[+5+4×(−2)](+2)×3+2×[+5+4×(-2)]

=6+2×[−3]=6−6=0