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Q.

Substance                                        Colour impartedFerric oxide                                          YellowChromic oxide                                      GreenCobalt oxide                                          BlueSelenium metal                                     RedManganese oxide                                PurpleCuprous oxide                                     RedCadmium sulphide                              YellowNickel oxide                                        Black                Cobalt oxide                                        Black Manganese oxide                               Blue How many of the compounds and they colors are mis-matched

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answer is 1.

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Detailed Solution

All are correct , Manganese oxide -Black
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