Science
Oxides of aluminium and zinc are:
options
- Acidic
- Basic
- Amphoteric
- Neutral
Metals & Non-Metals
2 Likes
Answer
Amphoteric
Reason —
- When oxides of aluminium and zinc react with acids like HCl, they behave as bases and form salts such as aluminium chloride or zinc chloride.
Al2O3 + 6HCl → 2AlCl3 + 3H2O
ZnO + 2HCl → ZnCl2 + H2O
- When oxides of aluminium and zinc react with alkalis like NaOH, they behave as acids and form complex salts such as sodium aluminate or sodium zincate.
Al2O3 + 2NaOH → 2NaAlO2 + H2O
ZnO + 2NaOH → Na2ZnO2 + H2O
Because oxides of aluminium and zinc react with both acids and bases, these oxides are classified as amphoteric oxides.
Hence, Aluminium oxide (Al2O3) and zinc oxide (ZnO) both show amphoteric behaviour.
Answered By
3 Likes
Related Questions
Carbon compounds :
(a) are good conductors of electricity.
(b) are bad conductors of electricity.
(c) have strong forces of attraction between their molecules.
(d) have weak forces of attraction between their molecules.
The correct statements are:
options
- (a) and (b)
- (b) and (c)
- (b) and (d)
- (a) and (c)
Consider the following compounds :
FeSO4; CuSO4; CaSO4; Na2CO3
The compound having maximum number of water of crystallisation in its crystalline form in one molecule is :
options
- FeSO4
- CuSO4
- CaSO4
- Na2CO3
The reaction given below is a redox reaction because in this case :
MnO2 + 4HCl → MnCl2 + 2H2O + Cl2
options
- MnO2 is oxidised and HCl is reduced.
- HCl is oxidised.
- MnO2 is reduced.
- MnO2 is reduced and HCl is oxidised.
Consider the following statements :
(a) The sex of a child is determined by what it inherits from the mother.
(b) The sex of a child is determined by what it inherits from the father.
(c) The probability of having a male child is more than that of a female child.
(d) The sex of a child is determined at the time of fertilisation when male and female gametes fuse to form a zygote.
The correct statements are:
options
- (a) and (c)
- (b) and (d)
- (c) and (d)
- (a), (c) and (d)