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1) ___ NaNO 3 + ___ PbO ___ Pb(NO 3 ) 2 + ___ Na 2 O<br />
2) ___ AgI + ___ Fe 2 (CO 3 ) 3 ___ FeI 3 + ___ Ag 2 CO 3<br />
3) ___ C 2 H 4 O 2 + ___ O 2 ___ CO 2 + ___ H 2 O<br />
4) ___ ZnSO 4 + ___ Li 2 CO 3 ___ ZnCO 3 + ___ Li 2 SO 4<br />
5) ___ V 2 O 5 + ___ CaS ___ CaO + ___ V 2 S 5
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