1
JEE Advanced 2014 Paper 1 Offline
Numerical
+4
-0
Among PbS, CuS, HgS, MnS, Ag2S, NiS, CoS, Bi2S3 nd SnS2 the total number of black coloured sulphides is
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2
IIT-JEE 2009 Paper 2 Offline
Numerical
+3
-1

The oxidation number of Mn in the product of alkaline oxidative fusion of MnO$$_2$$ is ___________.

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