Exams › JEE Main › Chemistry

In the following sets of reactants which two sets best exhibit the amphoteric character of Al2O3·xH2O ? Set I Al2O3·xH2O(s) + OH−(aq) Set II Al2O3·xH2O(s) + H2O(l) Set III Al2O3·xH2O(s) + H+(aq) Set IV Al2O3·xH2O(s) + NH3(aq)

1. 2 and 4
2. 1 and 2
3. 1 and 3
4. 3 and 4

Correct answer: 1 and 3

Solution

Al2O3·xH2O can act as both an acid and a base, which is the definition of amphoteric behavior. In Set I, it reacts with hydroxide ions (acting as an acid), and in Set III, it reacts with hydrogen ions (acting as a base), demonstrating its ability to interact with both types of reactants.

Related JEE Main Chemistry questions

• Which of the following arrangements shows the decreasing order of acidic nature?
• Which of the following sequences correctly arranges Al₂O₃, SiO₂, P₂O₃ and SO₂ in increasing acid strength?
• Which one of the following oxides shows amphoteric behaviour?
• In boric acid (H₃BO₃), the hybridisation states of the boron atom and the oxygen atoms are, respectively,
• A xenon fluoride compound contains 53.5% xenon by mass. What oxidation state does xenon have in this compound?
• For a cement of good quality, what should be the approximate ratios of the following? I. Silica to alumina II. CaO to the combined oxides of SiO2, Al2O3 and Fe2O3

⚔️ Practice JEE Main Chemistry free + battle 1v1 →