Which of the following is an amphoteric oxide ?

M g O

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A l_{2} O_{3}

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S i O_{2}

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P_{2} O_{5}

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Solution

The correct option is D $A l_{2} O_{3}$
$A l_{2} O_{3}$ is an amphoteric oxide.
Al dissolves in dil or conc HCl or $H_{2} S O_{4}$ and slowly liberates hydrogen gas.
$2 A l + 6 H C l + 12 H_{2} O \to 2 [A l (H_{2} O)_{6}] C l_{3} + 3 H_{2}$
Al dissolves in NaOH or KOH to form meta aluminate with the evolution of hydrogen gas. $2 A l + 2 N a O H + 2 H_{2} O \to 2 N a A l O_{2} + 3 H_{2} ↑$

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Similar questions

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

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

Choose the most appropriate answer from the following list of oxides which fit the descriptions. Each answer may be used only once:

[S O_{2}, S i O_{2}, A l_{2} O_{3}, M g O, C O, N a_{2} O]

(i) A basic oxide
(ii) An oxide which dissolves in water forming an acid.
(iii) An amphoteric oxide
(iv) A covalent oxide of a metalload.

Q. 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

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:
$M g O, Z n O, P_{2} O_{3}, A l_{2} O_{3}, N O_{2}$

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Which of the following is an amphoteric oxide ?

The correct option is D Al2O3Al2O3 is an amphoteric oxide.Al dissolves in dil or conc HCl or H2SO4 and slowly liberates hydrogen gas.2Al+6HCl+12H2O→2[Al(H2O)6]Cl3+3H2Al dissolves in NaOH or KOH to form meta aluminate with the evolution of hydrogen gas. 2Al+2NaOH+2H2O→2NaAlO2+3H2↑