下列有关物质性质的比较顺序中，不正确的是
A．微粒半径：K+＞Na+＞Mg2+＞Al3+
B．热稳定性：HF>HCl>HBr>HI
C．还原性：Li > Na > K > Rb
D．酸性：HClO4＞H2SO4＞H3PO4＞H2SiO3
答案：C
的原子核外均有
个电子，但核电核数依次增加，核对核外电子的引力逐渐增加，微粒半径依次减小，故A正确；
气态氢化物的热稳定性取决于非金属性，非金属性越强，稳定性越强。
的非金属性依次减弱，因而其气态氢化物热稳定性HF>HCl>HBr>HI，故B正确；
的原子核最外层均只有一个电子，在化学反应中都易失去而变为正一价阳离子，但随着核电荷数增加，核对最外层电子的引力逐渐减小，失去电子的增强，故其还原性
，故C错；
元素的氧化性越强，对应的最高价氧化性酸的酸性越强，所以酸性：HClO4＞H2SO4＞H3PO4＞H2SiO3，故D正确
故正确答案为C
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