What is the chemical composition of a soda-acid type fire extinguisher?

Which one of the following is used in soda-acid fire extinguishers?

Which of the following is used in fire alarm?

The most common chemicals used for cloud seeding are : 1. Silver iodide 2. Potassium iodide 3. Dry ice 4. Sodium Chloride Which of the above options is / are correct?

Which one of the following sodium compounds is used for softening hard water ?

Which one of the following types of medicines is used for treating indigestion?