水溶液中能大量共存的一组离子是( ) A.NH 、Ba2+、Br-、CO     

水溶液中能大量共存的一组离子是(  )

A.NH 、Ba2+、Br、CO       B.Cl、SO、Fe2+、H

C. K、Na、SO、MnO            D.Na、H、NO、HCO

答案

C [A项,Ba2+和CO因生成BaCO3沉淀而不能大量共存;B项,SO与H能结合生成弱电解质H2SO3而不能大量共存;C项,离子间互不反应,可以大量共存,正确;D项,H与HCO 能反应生成CO2和H2O而不能大量共存。]

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