With reference to 'Baking Soda', which of the following statements is/are correct?1.It is Sodium hydrogen carbonate.2.It is used in fire extinguishers.Select the correct answer from the code given below:

1. A

   Only 2

   Only 2. The NaHCO3 formula limb is also keyed.

2. B

   Neither 1 nor 2

   Neither. Both NCERT uses hold.

3. C

   Both 1 and 2

   Both 1 and 2. Baking soda is sodium hydrogen carbonate (NaHCO3). It is used in soda-acid fire extinguishers.

4. D

   Only 1

   Only 1. The extinguisher use is also keyed.

Summary. Official key is (c) both. Baking soda is NaHCO3 and it is used in fire extinguishers. Also note: Washing soda — Na2CO3·10H2O — different salt; Heat — NaHCO3 gives CO2 on heating; baking and extinguishers; Antacid — Mild; another NCERT use; Solvay — Industrial NaHCO3 / Na2CO3 route.