Respuesta :
The third reaction will form a gaseous product, CO₂
KHCO₃ + HBr → KBr + H₂O + CO₂
KHCO₃ + HBr → KBr + H₂O + CO₂
The reaction that would result in formation of gaseous product is
KHCO3 + HBr ( third answer)
explanation
KHCO3 react with HBr to form KBr , CO2 and H2O according to the below equation.
KHCO3 + HBr → KBr + CO2 + H2O
CO2 ( carbon (IV) oxide) is the gas that is formed during reaction.
other reaction does not produce a a gas for example NaOH + HCl forms NaCl and H2O