57. --- Would you like some wine? --- Yes. Just . A. little B. very little C. a little D. little bit 答案:C
已知反应:BeCl2+Na2BeO2+2H2O2NaCl+2Be(OH)2↓能完全进行,则下列推断正确的有
A.
BeCl2溶液的pH<7,将其蒸干,灼烧后的残留物Be(OH)2
B.
Na2BeO2溶液的pH<7将其蒸干,灼烧后的残留物BeO
C.
Be(OH)2既能溶于盐酸,又能溶于NaOH溶液
D.
BeCl2水溶液导电性强,故BeCl2一定为离子化合物