Thenard's blue is:

CHEMISTRY · Single correct · CBSE · Chemistry · d- and f-Block Elements · d- and f-Block Elements

Problem

Thenard's blue is: (1) CoAl2O4\text{CoAl}_2\text{O}_4 (2) Fe4[Fe(CN)6]3\text{Fe}_4[\text{Fe}(\text{CN})_6]_3 (3) K2Fe[Fe(CN)6]\text{K}_2\text{Fe}[\text{Fe}(\text{CN})_6] (4) [Cu(NH3)4](OH)2[\text{Cu}(\text{NH}_3)_4](\text{OH})_2

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