Metals Reaction with Oxygen (Burnt in Air)

Q.

Give reasons for the following:

The reaction of Iron (III) oxide$\left[{\mathrm{Fe}}_2{\mathrm{O}}_3\right]$ with heated Aluminium is used to join cracked machine parts.

Q.

Give an example of a noble metal.

Q. Silver and gold do not react with oxygen even at a very high temperature and are called ___.

1. noble metals
2. inert metals
3. Either a or b
4. None of these

Q.

Compound X and aluminium are used to join railway tracks.

(a) Identify the compound X

(b) Name the reaction

(c) Write down its reaction.

Q.

Which metal oxide, when heated produces a silvery-white mirror on the side of the test tube?

Q.

Complete the following reaction :

$$\begin{gathered} \mathrm{FeO}+{\mathrm{O}}_2\stackrel{}{\to }\mathrm{\_\_\_\_\_\_\_\_} \\ \left(\mathrm{brown}\right) \end{gathered}$$

Q.

What is formed when hot copper reacts with oxygen in air?

1. Alloy

2. Metalloid

3. Oxide

4. Degradation

Q. Choose the correct pair based on the state of the given metals at normal room temperature.

1. Mercury
2. Carbon
3. Gas
4. Helium
5. Solid
6. Liquid

Q.

Metals react with oxygen in air to form _________.

1. Carbonates

2. Oxides

3. Sulphides

4. Nitrates

Q.

A metal X reacts with oxygen to form a compound which possess high melting point. The compound is also soluble in water. The element X is:

1. Calcium
2. Carbon
3. Silicon
4. Sulphur

Q. Choose the correct pair based on the state of the given metals at normal room temperature.

Q. If steel is heated to a temperature well below red heat and is then cooled slowly, the process is called

1. Hardening
2. Softening
3. Annealing
4. Tempering

Q.

Which substance is formed when aluminium reacts with oxygen?

1. Al₂O₃

2. AlO₃

3. AlO

4. Al₂O