Amphoteric Oxides of Metals

Q. Question 6
What are amphoteric oxides? Give two examples of amphoteric oxides.

Q.

Which substance is formed when aluminium reacts with oxygen?

1. ${Al}_2{O}_3$

2. $AlO$

3. ${Al}_{2}O$

4. $Al{O}_3$

Q.

What are amphoteric oxides?

Q.

Write equation for the action of zinc oxide on sodium hydroxide.

Q.

Metal oxides which react with both acids as well as bases, to produce salt and water are known as ___.

Q.

What name is given to those metal oxides which show basic as well as acidic behaviour?

Q.

$\mathrm{SnO}$ is called an amphoteric Oxide. Give an explanation for it.

Q.

Why is ZnO called an amphoteric oxide? Name another amphoteric oxide?

Q.

Name two metals which from amphoteric oxides.

Q. Which of the following oxides is amphoteric in nature?

1. 
   Carbon monoxide
2. 
   Magnesium oxide
3. 
   Zinc oxide
4. 
   Sodium oxide

Q. Which of the following metals form amphoteric oxide?

1. Aluminium
2. Iron
3. Copper
4. Silver

Q.

Zinc oxide reacts with both NaOH and HCl, thus it is called ________.

1. Acidic oxide

2. Basic oxide

3. Amphoteric oxide

4. None of these

Q.

(a) What are amphoteric oxides? Give two examples of amphoteric oxides.
(b) Choose the acidic oxides, basic oxides and neutral oxides from the following:
$N{a}_{2}O:C{O}_2;CO;S{O}_2;MgO;N_{2}O;H_{2}O.$
(c) Which of the following are amphoteric oxides:
$MgO,ZnO,P_2{O}_3,A{l}_2{O}_3,N{O}_2$

Q. What do you understand by amphoteric oxide? Give the balanced equations for the reaction with three different amphoteric oxides with a caustic alkali. Write your observation if any.

Q.

What happens when aluminium is heated at ${800}^{0}C$?

Statement 1: Aluminium reacts with air to form chlorides.

Statement 2: On heating aluminium at ${800}^{0}C$, it burns to form its oxides and nitrides.

1. Statement 1 and statement 2 are true.

2. Statement 1 and statement 2 are false.

3. Statement 1 is true and statement 2 is false.

4. Statement 1 is false and statement 2 is true.

Q.

Out of the following oxides, the amphoteric oxide is :
(a) $F{e}_2{O}_3$ (b) $A{l}_2{O}_3$ (c) $P_2{O}_3$ (d) $N_{2}O$

Q.

State what do you observe when moist blue litmus paper is placed in a gas jar of Hydrogen chloride.

Q.

Assertion: Metal oxides are basic in nature.

Reason: Metal oxides neutralise the effect of acids and release water, similar to the reaction of a base with an acid.

1. Both assertion and reason are true and the reason is the correct explanation of assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of assertion.
3. Only assertion is correct.
4. Only reason is correct.

Q.

Zinc oxide is a metallic oxide . Which of the following term best describes the nature of zinc oxide:
(a) an acidic oxide (b) a basic oxide (c) an amphoteric oxide (d) a neutral oxide

Q.

The metals which can produce amphoteric oxides are:
(a) Sodium and aluminium (b) zinc and potassium (c) calcium and sodium (d) aluminium and zinc

Q.

(a) What do you understand by amphoteric oxide ? (b) Give the balanced equations for the reaction with two different amphoteric oxides with a caustic alkali. (c) Name the products formed.

Q. Which of the following metals forms amphoteric oxide?

1. Copper
2. Silver
3. Iron
4. Aluminium

Q. is a metal which reacts with oxygen gas to form an amphoteric oxide.

1. Potassium
2. Calcium
3. Aluminium

Q.

Aluminium reacts with steam to form

1. Aluminium hydroxide

2. Aluminium dioxide

3. Aluminium oxide

Q.

Metal A burns in air, on heating, to form an oxide \(A_2O_3\). \(A_2O_3\) can react with hydrochloric acid as well as sodium hydroxide solution to form the corresponding salts and water.

(a) What is the nature of oxide \(A_2O_3\)?

(b) Name one metal like A.

(c) Which gas is produced when a metal like A is added

to dilute sulphuric acid?

Q.

Give an example of amphoteric oxide.

Q.

Which of the following metals form amphoteric oxide?

1. Sodium

2. Silver

3. Aluminium

4. Iron

Q.

Choose the most appropriate answer from

$[S{O}_2,Si{O}_2,A{l}_2{O}_3,CO,MgO,N{a}_{2}O]$

(a) A covalent oxide of a metalloid.

(b) An oxide which when dissolved in water form acid.

(c) A basic oxide.

(d) An amphoteric oxide.

Q.

Aluminium oxide reacts with hot concentrated solution of sodium hydroxide to form:

1. sodium aluminate

2. aluminium hydroxide

3. aluminium hydride

4. sodium aluminate hydroxide

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. Acid will give water.

2. Base contains H⁺.

3. Water is in between acid and base.

4. Aluminum oxide is amphoteric.