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- (a) How does the metallic character of an element correlate with the acidity of its oxide? (b) What trends, if any, exist in ox-ide basicity across a period and down a group?Some metal oxides, such as Sc2O3, do not react with purewater, but they do react when the solution becomes eitheracidic or basic. Do you expect Sc2O3 to react when the solutionbecomes acidic or when it becomes basic? Write a balancedchemical equation to support your answer.Describe the trend in acid – base behaviour of the Period 3 oxides based on the above reactions, moving from left to right across the Period. Describe the nature of oxides in period 3?
- When solid CrO3is dissolved in water, the solution is or-ange rather than the yellow of H2CrO4. How does this observa-tion indicate that CrO3is an acidic oxide?What is valence-state electronegativity? Explain the changein acidity of the oxides of Mn with changing O.N. of the metal.Calculate the pH for a 0.200 M KClO2 aqueous solution. (Ka for HClO2 is 1.1× × 10–2).
- Arrange the following hydrides in the order of acidic strength and justify theorder: PH3, AsH3, NH3 and BiH3.Nickel and copper ores are generally sulfides, whereasaluminum ore is an oxide. Explain this observation on thebasis of the hard/soft acid/base concept.Is the interaction between an ammonia ligand and a metal cation a Lewis acid–baseinteraction? If so, which species acts as the Lewis acid?
- The value of Ka for nitrous acid 1HNO22 at 25 °C is given in Appendix D. (a) Write the chemical equation for the equilibrium that corresponds to Ka.Would you expect an aqueous solution of manganese (VII) oxide to have a ph greater or less than 7.0? Justify your answerRank the following oxides in order of increasing acidity inwater: Sb₂O₃, Bi₂O₃, P₄O₁₀, Sb₂O₅.