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【单选题】
下列除去杂质的方法正确的是( )A.
除去N 2 中的少量O 2 ：通过灼热的CuO粉末，收集气体
B.
除去CaO中的少量CaCO 3 ：加入足量的稀盐酸，充分反应
C.
除去KCl溶液中的少量MgCl 2 ：加入适量NaOH溶液，过滤
D.
除去Cu(NO 3 ) 2 溶液中的少量AgNO 3 ：加入足量铜粉，充分反应后过滤
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