Find the number of amphoteric oxide(s) from the following
$N i O, A l_{2} O_{3}, B_{2} O_{3}, P b O_{2}, Z n O, M g O$ .

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Solution

The trend is from strongly basic oxides on the left-hand side to strongly acidic ones on the right, via an amphoteric oxide (aluminium oxide) in the middle in the periodic table.

An amphoteric oxide is one which shows both acidic and basic properties. This trend applies only to the highest oxides of the individual elements in the highest oxidation states for those elements. The pattern is less clear for other oxides.

Non-metal oxide acidity is defined in terms of the acidic solutions formed in reactions with water—for example, sulphur trioxide reacts with water to forms sulfuric acid.

Weakly acidic : $B_{2} O_{3}$
Acidic: $N i O$
Amphoteric : $A l_{2} O_{3}, Z n O$
Basic : $M g O, P b O_{2}$
Hence, two oxides are amphoteric in nature.

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Similar questions

Q. Classify the following oxides into acidic, basic and amphoteric.

C a O

M g O

C O_{2}

S O_{3}

N a_{2} O

Z n O

A l_{2} O_{3}

F e_{2} O_{3}

(a) What are amphoteric oxides? Give two examples of amphoteric oxides.
(b) Choose the acidic oxides, basic oxides and neutral oxides from the following:
$N a_{2} O : C O_{2}; C O; S O_{2}; M g O; N_{2} O; H_{2} O .$
(c) Which of the following are amphoteric oxides:
$M g O, Z n O, P_{2} O_{3}, A l_{2} O_{3}, N O_{2}$

Q. (a) Classify following oxides as neutral, acidic, basic or amphoteric:

C O, B_{2} O_{3}, S i O_{2}, C O_{2}, A l_{2} O_{3}, P b O_{2}, T l_{2} O_{3}

(b) Write suitable chemical equations to show their nature.

Q. Which one of the following is an amphoteric oxide?

B_{2} O_{3}, A l_{2} O_{3}

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) $N_{2} O$

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Find the number of amphoteric oxide(s) from the followingNiO,Al2O3,B2O3,PbO2,ZnO,MgO.

Find the number of amphoteric oxide(s) from the following
$N i O, A l_{2} O_{3}, B_{2} O_{3}, P b O_{2}, Z n O, M g O$ .