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【简答题】
某种常见的晶体A，与盐酸反应产生无刺激性气味的气体B。将B通入澄清石灰水中，石 灰水变浑浊。若在A的溶液中加氢氧化钡溶液，则析出白色沉淀C和无色气体D；D可以使湿润的红色石蕊试纸变蓝。加热固体A，可生成水、B和D，而且B和D的物质的量之比为1∶1。根据以上事实可以判断出A是__________，B是__________，C是__________。加热固体A生成水、B和D的化学方程式是__________。
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