Which of the following substances are blue?

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

Problem

Which of the following substances are blue? (1) Fe(BO2)2\text{Fe}(\text{BO}_2)_2 (2) CoAl2O4\text{CoAl}_2\text{O}_4 (3) Co(BO2)2\text{Co}(\text{BO}_2)_2 (4) NaCoPO4\text{NaCoPO}_4

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