Metals Reaction with Acid

Q.

Sulphur is used as gunpowder, matchbox and fireworks.

1. True

2. False

Q. The striking surface of a matchbox is mainly made up of ________.

1. argon
2. sodium
3. phosphorus
4. potassium

Q. What is the main chemical component present in striking surface of a matchbox?

1. Potassium chlorate
2. Potassium
3. Graphite
4. Phosphorus

Q.

In modern matches, what needs to be rubbed on what to ignite the match?

1. Sulphur

2. Potassium Chlorate

3. Both Potassium Chlorate and Sulphur

4. Nitrogen

Q.

What do we understand by flammability of substance?

1. Ability to burn in the presence of CO₂

2. Ability to burn in the presence of O₃

3. Ability to burn in the presence of O₂

4. Ability to burn in the presence of N₂

Q. A noble metal is one which is inert and does not react with acids like $HCl,HN{O}_3,H_{2}S{O}_4$. Select an option with a set of two noble metals.

1. Gold (Au); Silver (Ag)
2. Gold (Au); Platinum (Pt)
3. Silver (Ag); Platinum (Pt)
4. Gold (Au); Iron (Fe)

Q. We can see the flames of fire.Now these flames should be made up of something.What are the type(s) of atoms that make a flame of fire?

Q.

Definition (produces hydroxyl ions on dissolution in water)

Al(OH)₃ 🡪