Which of the following chemicals are vastly used in gunpowder of fireworks?

1. Silver nitrate and charcoal

2 Silver nitrate and sulphur

3. Potassium sulphate and Phosphorous

4. Potassium nitrate, sulphur and charcoal

5 None of the above/More than one of the above.

I know this is a lot but please help.

1. Potassium Sulfate and Barium Nitrate.

2. Hydrochloric Acid and Silver Nitrate.

3. Hydrochloric acid and Potassium Hydroxide.

4. Silver (I) Nitrate and Copper (II) Chloride

5. Silver (I) Nitrate and Potassium (II) Chloride

6. Sodium Sulfide and Copper (II) Chloride

7. Sodium Sulfate and lead (II) Nitrate

Decide whether a precipitate will form when the following solutions are mixed. If a precipitate forms, write a net ionic equation for the reaction.

(a) potassium nitrate and magnesium sulfate

(b) silver nitrate and potassium carbonate

(c) ammonium carbonate and cobalt(III) chloride

(d) sodium phosphate and barium hydroxide

(e) barium nitrate and potassium hydroxide

Decide whether a precipitate will form when the following solutions are mixed. If a precipitate forms, write a net ionic equation for the reaction

a. potassium nitrate and magnesium sulfate

b. silver nitrate and potassium carbonate

c. ammonium carbonate and cobalt(III) chloride

d. sodium phosphate and barium hydroxide

e. barium nitrate and potassium hydroxide