Which of the following is a precipitation reaction?
A) 2HBr(aq) + NiS(s) → NiBr2(aq) + H2S(g)
B) NH4I(aq) + NaOH(aq) → H2O(l) + NH3(g) + NaI(aq)
C) 2C4H6(g) + 11O2(g) → 8CO2(g) + 6H2O(g)
D) NO(g) + H2O(g) → NH3(g) + O2(g)
E) CrBr2(aq) + Na2CO3(aq) → CrCO3(s) + 2NaBr(aq)
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