Single correct option
On heating, sodium hydrogen carbonate (baking soda) decomposes to give
- A. sodium oxide, carbon dioxide and hydrogen
- B. sodium hydroxide and carbon dioxide
- C. sodium carbonate and oxygen
- D. sodium carbonate, carbon dioxide and water
Show answer and solution
Answer: (D) sodium carbonate, carbon dioxide and water
2NaHCO3 on heating gives Na2CO3 + H2O + CO2. The released carbon dioxide makes cakes and bread rise, which is why baking soda is used in baking powder. The other options either show impossible products such as hydrogen, or leave out water, or add oxygen which is not formed.
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