Oxidizing/reducing agents問題~~~~教下我.......唔該 ..

你想問點解有d酸有氧化性(例如濃硝酸和濃硫酸)? 通俗黎講係硝酸同硫酸有太多氧原子, 學術黎講係硝酸的氮和硫酸的硫的氧化數高. 因為氮和硫都有太多氧原子, 而氮和硫本身又唔係強的還原劑, 唔鐘意被過度氧化, 所以一有機會, 就會將氧推走, 將人地氧化. 本身酸根含氧太多o既酸先有咁o既性質(例如HNO3, H2SO4), 酸根含氧不多或無氧(例如H2SO3, HCl), 或酸根中心原子本身還原性較強(H2CO3)o既酸就冇咁o既性質. 氧化性跟酸鹼強度係無關. 所以alkali既可以係或唔係oxidizing agents, 睇翻OH-所配o既正離子, 如果係活潑金屬o既離子如Na+, 跟本冇氧化性, 如果係不活潑金屬o既離子如Cu2+, 咁就d咁多氧化性. 不過不活潑金屬o既氫氧化物多數沈澱, 不太會顯示氧化性.
rate of rusting係會隨離子增高而增快, 所以o係有水, 有酸或鹼o既情況下, 生銹會加快.

actually, the term acid refers to proton donar, according to Bronsted and Lowry's theory, or more precisely, refers to electron acceptors, according to Lewis' definition, so many molecules do not contain H atoms, but they ar still acids. consider when water is added to HNO3, water is a base while HNO3 is an acid, but if H2O is added to NH3, H2O acts as an acid.
but i think ur term acid refers to molecules hving H atoms, as u know, when reaction occurs, acids always produce hydrogen gas after reaction, as seen in the formula of acids, such as HCl or dilute H2SO4, the oxidation number of H here ar +1, after reaction, which means H2 is produced, the oxidation number of H is now 0, the acid itself undergoes reduction, while oxidising another reactant, so that's why acids ar always oxidising agents.
i think ordinary bases ar not oxidising agents.

no. only acids accelerate rusting, while alkalis inhibits rusting