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【单选题】
已知Na 2 SO 4 和NaCl混合溶液中，Cl - 的物质的量浓度是Na + 的物质的量浓度的 倍，下列叙述中正确的是（ ）A.
Na 2 SO 4 和NaCl的物质的量之比为1 ：3
B.
溶液中一定有1molNa 2 SO 4 和3molNaCl
C.
所带电荷数SO 4 2- 是Na + 的 倍
D.
SO 4 2- 与Cl - 的物质的量之和等于Na + 的物质的量
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A.
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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