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【简答题】
化合物A加入水中得白色沉淀B和无色溶液C。取溶液C与饱和H 2 S溶液作用生成棕黑色沉淀D，D不溶于NaOH溶液，能溶于盐酸。向溶液C中加入NaOH溶液有白色沉淀E生成，E不溶于NaOH溶液。向SnCl 2 溶液中加入过量NaOH溶液后滴加溶液C，有黑色沉淀F生成。向溶液C中加入AgNO 3 溶液有白色沉淀G生成，G不溶于硝酸易溶于氨水，试给出A，B，C，D，E，F和G的化学式。
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