State PCS PYQPrelims 2025

UPPCS · প্রশ্ন 7

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 using the code given below.

  1. Neither 1 nor 2
  2. Only 1
  3. Only 2
  4. Both 1 and 2
উত্তর দেখান ও ব্যাখ্যা

উত্তর: (D) Both 1 and 2

ব্যাখ্যা

Baking soda is NaHCO3; soda-acid fire extinguishers use it to release CO2 when mixed with acid.