Which of the following compounds does not have similarity in its structural aspect?

CHEMISTRY · Single correct · CBSE · Chemistry · Acids, Bases and Salts · Acids, Bases and Salts

Problem

Which of the following compounds does not have similarity in its structural aspect? (1)

FeSO_4 \cdot 7H_2O

(2)

Na_2CO_3 \cdot 7H_2O

(3)

MgSO_4 \cdot 7H_2O

(4)

ZnSO_4 \cdot 7H_2O