JEE Advanced Chemistry question

Select the correct statement(s) about oxides of d-block elements.

(A)MO type oxides have NaCl-type structureCorrect
(B)All oxides are thermodynamically stable, their heats of formation being negative ()Correct
(C)Oxides of the same metal in different oxidation state have different stabilitiesCorrect
(D)The oxides are basic in low oxidation states and acidic in high oxidation statesCorrect

Answer: (A),(B),(C),(D)

Solution

Monoxides such as TiO, VO, MnO, FeO, CoO and NiO adopt the rock-salt (NaCl-type) lattice (a). Transition-metal oxide formation from the elements is generally strongly exothermic, so for essentially all of them (b). Different oxidation-state oxides of the same metal (e.g. CrO,

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Question ID VK-159896