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One of the reactions below is not correctly balanced. Which one?

/in /by

One of the reactions below is not correctly balanced. Which one?

A.2NH3 + 7O2 → 2NO2 + 3H2O
B. 2NaHCO3 → Na2CO3 + H2O + CO
C.Cr2(SO4)3 + 6KOH → 2Cr(OH)3 + 3 K2SO4
D. 2Cr + 6HCl → 2CrCl3 + 3H2
E.none of the above

 
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