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प्रश्न
Metal oxides generally react with acids, but few oxides of metal also react with bases. Such metallic oxides are:
- MgO
- ZnO
- Al2O3
- Cao
पर्याय
I and II
II and III
III and IV
I and IV
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उत्तर
II and III
Explanation:
Some metal oxides, such as aluminium oxide, zinc oxide shows both acidic as well as basic behaviour. Such metal oxides that react with both acids and bases to produce salt and water are known as amphoteric oxides.
Aluminium oxide reacts with base as follows:
\[\ce{Al2O3 + 2NaOH -> \underset{(Sodium aluminate)}{2NaAlO2} + H2O}\]
ZnO is an oxide that can react with base, as shown by the equation given below:
\[\ce{ZnO + 2NaoH -> Na2ZnO2 + H2O}\]
संबंधित प्रश्न
Name two metals which will displace hydrogen from dilute acids, and two metals which will not.
What are amphoteric oxides?
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- Which reaction is shown in the figure?
- Which gas is evolved in the reaction?
- Give an example of reactants that rapidly show this reaction. Give equations.
- Give an example of reactants that do not react rapidly.
- In what condition will reactants of (c) part react? Give equation.
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| Metal | Gas Evolved |
| Copper | Yes |
| Iron | Yes |
| Magnesium | No |
| Zinc | Yes |
Select the correct observation(s) and give chemical equation(s) of the reaction involved.
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