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对下列实验过程的评价，正确的是（ ）

A.某固体中加入稀盐酸，产生了无色气体，证明该固体一定含CO₃^2-

B.某溶液中滴加氯化钡溶液，生成不溶于稀硝酸的白色沉淀，该溶液中一定含有SO₄^2-

C.某无色溶液中滴入酚酞试液显红色，该溶液不一定是碱溶液

D.验证烧碱中是否含Cl^-,先加足量稀硝酸，再加硝酸银溶液，有白色沉淀出现，证明含Cl^-