Which of the following reaction is a double displacement reaction?
А. C6H12O6 + 6O2 -- 6CO2 + 6H2O
B. 6 CO2 +6 H20 -- C6H1206 + 6O2
C. HCN + NaOH -- NaCN + H2O
D. Zn + 2HCL -- ZnCl2 + H2
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C. is a double displacement reaction.
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