Q.

Calculate the total number of coloured compounds (white/colourless not included) out of the following
1) FeS             2)   FeS2                  3) MnOH2   

 4)  Fe4[Fe(CN)6]3  5) Cu2I2    6)  ZnS    7)  Ag2S2O3      8)  Ag2S
9) ZnO(Hot)    10)  CrO2Cl2   11) Cu2[Fe(CN)6]     12) Hg2CrO4 
13) KO3    14)KBr     15)  H2S
 

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answer is 9.

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