MCQ
Fehling solution is
- AAmmoniacal cuprous chloride solution
- BAcidified copper sulphate solution
- ✓Copper sulphate and sodium hydroxide $+$ Rochelle salt
- DNone of these
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$Ag$ , $Ni$ , $Cr$


$(i)$ Manganese exhibits $+7$ oxidation state in its oxide.
$(ii)$ Ruthenium and Osmium exhibit $+8$ oxidation in their oxides.
$(iii)$ $Sc$ shows $+4$ oxidation state which is oxidizing in nature.
$(iv)$ $Cr$ shows oxidising nature in $+6$ oxidation state.
