Advertisements
Advertisements
Question
Metal oxides generally react with acids, but few oxides of metal also react with bases. Such metallic oxides are:
- MgO
- ZnO
- Al2O3
- Cao
Options
I and II
II and III
III and IV
I and IV
Advertisements
Solution
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:
\[\ce{ZnO + 2NaoH -> Na2ZnO2 + H2O}\]
RELATED QUESTIONS
Give two examples of amphoteric oxides.
Name two metals which will displace hydrogen from dilute acids, and two metals which will not.
Diamond : electric insulator : : _______ : electric conductor
Which of the following metals liberate hydrogen with 5% HNO3?
(i) Cu
(ii) Zn
(iii) Mn
(iv) Mg
Which one of the following metals does not react with cold as well as hot water?
Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?
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?
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:
\[\ce{Zn_{(s)} + H_2SO_{4(l)} ->ZnSO_{4(X)} + H_{2(Y)}}\]
Write a chemical equation showing the ionic products formed on dissolving potassium hydroxide in water.
