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单选题
下面物质中既能从溶液中制取也能用游离元素直接合成的是( ).
A
FeS
B
CuS
C
NH4SO42-
D
H2SO4
参考答案
参考解析
解析:
A项,FeS可用铁、硫化合得到,也能用FeSO4溶液与Na2S复分解反应得到;B项,CuS可用铜盐与H2S或Na2S反应制备,但铜单质与硫单质反应只能得到Cu2S;CD两项,NH4SO42-与硫酸均只能从溶液中制取.
A项,FeS可用铁、硫化合得到,也能用FeSO4溶液与Na2S复分解反应得到;B项,CuS可用铜盐与H2S或Na2S反应制备,但铜单质与硫单质反应只能得到Cu2S;CD两项,NH4SO42-与硫酸均只能从溶液中制取.
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