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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
Give two examples of amphoteric oxides.
Name two metals which will displace hydrogen from dilute acids, and two metals which will not.
What are amphoteric oxides?
Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?
When a metal X is treated with cold water, it gives a basic salt Y with molecular formula XOH (Molecular mass = 40) and liberates a gas Z which easily catches fire. Identify X, Y and Z and also write the reaction involved.
The metal which produces hydrogen gas on reaction with dilute hydrochloric acid as well as sodium hydroxide solution is ______.
Zinc sulphate forms a colourless solution in water. Will you observe any colour on adding copper turning in it?
Answer the questions based on the figure below:
- Which experiment setup is demonstrated in the figure?
- What do you conclude after the reactions? Name reaction.
Select the appropriate state symbols of the products given as X and Y in the following chemical equation by choosing the correct option from table given below:
\[\ce{Zn_{(s)} + H_2SO_{4(l)} ->ZnSO_{4(X)} + H_{2(Y)}}\]
On adding dilute sulphuric acid to a test tube containing a metal ‘X’, a colourless gas is produced when a burning match stick is brought near it. Which of the following correctly represents the metal ‘X’?
