Which one of the following is a redox reaction?
A) 2Na( g) + Cl 2( g) → 2NaCl( s)
B) Ba 2+( aq) + SO 4 2−( aq) → BaSO 4( s)
C) K 2Cr 2O 7( aq) + 2KOH( aq) → 2K 2CrO 4( aq) + H 2O( l)
D) Na 2CO 3( s) + 2HCl( aq) → 2NaCl( aq) + CO 2( g) + H 2O( l)
E) H 2O( l) → H +( aq) + OH −( aq)
Correct Answer:
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