1.

Which of the following is a chemical displacement reaction?

A. \[2Al+F{{e}_{2}}{{O}_{3}}\xrightarrow[{}]{heat}A{{l}_{2}}{{O}_{3}}+2Fe+Heat\]
B.                         \[2Na+C{{l}_{2}}\to 2\,NaCl\]
C.                         \[{{P}_{2}}{{O}_{5}}+3{{H}_{2}}O\xrightarrow{{}}2{{H}_{3}}P{{O}_{4}}\]
D.                         \[2\,PbS+3{{O}_{2}}\xrightarrow[{}]{heat}PbO+3S{{O}_{2}}\]
Answer» B.                         \[2Na+C{{l}_{2}}\to 2\,NaCl\]


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