Question

zinc sulphate formulae by criss cross method

Answer 1

$zn {}^{2 + } \: \: \: \: \: \: so {}^{ - 2} 4$


-2 and +2 will cancel each other and we get

ZnSO4


Thanks

Answer 2

Valency of zinc = 2
Valency of sulphate = -2
Formulae of zinc sulphate = ZnSO4