Question

A gas that reacts with CaO and not with NaHCO3 is :

a. CO2
b. Cl2
c. O2
d. N2​

Answer 1

A gas that reacts with CaO and not with NaHCO3 is Cl2

CaO+Cl2 → CaOCl2

NaHCO3 + I2Cl2 → No reaction

Answer 2

A gas that reacts with CaO and not with NaHCO3 is a. CO2.

• The reaction of CaO with CO2 gives CaCO3 while CO2 does not react with NaHCO3 but on the decomposition of NaHCO3, CO2 is formed.
• Cl2 react with both CaO and NaHCO3.
• The reaction of Cl2 with NaHCO3 Is Cl2 + NaHCO3 = H2O + NaCl + CO2 + NaClO.
• O2 reacts with both CaO and NaHCO3.
• Reactions of O2 with NaHCO3 and CaO are NaHCo3 + O2 = Na2Co3 + Co2 + H2O and 2CaO + O2 = 2CaO2 respectively.
• The reaction of O2 with NaHCO3 and CaO is NaHCO3 + N2 = NaNO3 + C2H2 and CaO + N2 = Ca3N2 + O2 respectively.