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Questions and Answers
Which metal does not form MO oxides?
Which metal does not form MO oxides?
Which metal oxide has the highest oxidation number among Sc_{2}O_{3}, Mn_{2}O_{7}, Fe₂O, and V_{2}O_{5}?
Which metal oxide has the highest oxidation number among Sc_{2}O_{3}, Mn_{2}O_{7}, Fe₂O, and V_{2}O_{5}?
Which of the following metals exhibits a covalent green oxide?
Which of the following metals exhibits a covalent green oxide?
Which metal oxide is mainly acidic and gives HMnO upon reaction?
Which metal oxide is mainly acidic and gives HMnO upon reaction?
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Which metal's oxide is described as amphoteric but mainly acidic?
Which metal's oxide is described as amphoteric but mainly acidic?
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Which chromium compound is basic, according to the text?
Which chromium compound is basic, according to the text?
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Study Notes
Oxides and Oxoanions of Metals
- Metals, except scandium, form MO oxides, which are ionic, through reaction with oxygen at high temperatures.
- The highest oxidation number in the oxides coincides with the group number and is attained in Sc₂O₃ to Mn₂O₇.
- Beyond group 7, no higher oxides of iron above Fe₂O₃ are known.
Properties of Higher Oxides
- As the oxidation number of a metal increases, its ionic character decreases.
- Higher oxides, such as Mn₂O₇, CrO₃, and V₂O₅, have low melting points.
- These higher oxides exhibit acidic character, with Mn₂O₇ giving HMnO₄, and CrO₃ giving H₂CrO₄ and H₂Cr₂O₇.
- V₂O₅ is amphoteric, giving VO₄³⁻ and VO₂⁺ salts.
Vanadium Oxides
- V₂O₃ is basic, while V₂O₄ is less basic, and V₂O₅ is amphoteric.
- V₂O₄ dissolves in acids to give VO²⁺ salts.
- V₂O₅ reacts with alkalies to give VO₄³⁻ and with acids to give VO₂⁺ ions.
Chromium Oxides
- CrO is basic, while Cr₂O₃ is amphoteric.
- Potassium dichromate (K₂Cr₂O₇) is a significant chemical used in the leather industry and as an oxidant for preparing azo compounds.
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Description
This quiz covers the formation of oxides and oxoanions of metals, including the relationship between oxidation numbers and group numbers. It also includes information on the stability of oxocations.
