Amphoteric Oxides of Metals

Q.

The valencies of aluminium and chlorine in the compound $AlC{l}_3$ respectively are ______ and _____.

1. 3, 1

2. 1, 3

3. 1, 1

4. 3, 3

Q.

Zinc oxide reacts with $Ca{\left(OH\right)}_2$ and $H_{2}S{O}_4$, thus it is called ________.

1. Metallic oxide

2. Metal hydroxide

3. Rust

4. Amphoteric oxide

Q.

Metals react with water to form metal oxide and _______ .

1. Water Gas

2. Acid

3. Hydrogen Gas

4. Non-Metal Oxide

Q. are all metal oxides basic in nature?

Q.

Non-metals generally react with oxygen to form:

1. Acidic oxides.

2. Basic Oxides.

3. Amphoteric Oxides.

4. Neutral Oxides.

Q.

${Al}_2{O}_3$ + $6HCl$ $\to$ $2Al{Cl}_3$ + $3H_{2}O$

${Al}_2{O}_3$ + $2NaOH$ $\to$ $2NaAl{O}_2$ + $H_{2}O$

(Sodium aluminate)

From the above reactions, you can conclude that _______.

1. Aluminum oxide is amphoteric.

2. Base contains H⁺.

3. Water is in between acid and base.

4. Acid will give water.

Q. Although metals generally form basic oxides, which of the following metals form an amphoteric oxide?

1. $Na$
2. $Al$
3. $Cu$
4. $Ca$

Q. The oxide of sodium is ____________ in nature.

1. acidic
2. neutral
3. salty
4. basic