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JEE Advanced 2014 Paper 1

Section: Chemistry
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Question : 31 of 60
 
Marks: +1, -0
Among PbS, CuS, HgS, MnS, Ag‌2S, NiS, CoS, Bi‌2S‌3 and SnS‌2, the total number of BLACK coloured sulphides is
[JEE Adv 2014 P1]
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