R、W、X、Y、Z为原子序数依次递增的同一短周期元素,m、n均为正整

RWXYZ为原子序数依次递增的同一短周期元素,mn均为正整数,下列说法正确的是( )

A.离子半径:Rn+>W(n+1)+>Zm-

B.若Y的最高价氧化物对应的水化物HnYOm为强酸,则X的氢化物沸点一定比Y的氢化物的沸点低

C.若X的气态氢化物能使湿润的石蕊试纸变蓝,则标准状况下,18g Y的氢化物的体积为2.24 L

D.若R(OH)n为弱电解质,则W(OH)n+1可与KOH溶液反应

答案

D

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