Black Salt

Chemistry Level 2

\[\ce{ MnO_2} \qquad \; \ce{KO_2} \qquad \; \ce{FeO} \qquad \; \ce{Bi_2S_3}\\ \ce{CuCrO_4} \qquad \; \ce{Pb_3O_4} \qquad \; \ce{Sb_2S_3} \qquad \;\ce{MnCO_3 }\]

How many of the salts above are black in colour?

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