JEE Main 2014 · 9 Apr · Shift 1 · Chemistry Q47

ChemistrySingle correct+4 / -1Question 47 of 90

In the following sets of reactants which two sets best exhibit the amphoteric character of $\ce{Al2O3.xH2O}$ ?

Set 1 : $\ce{Al2O3.xH2O(s)}$ and $\ce{OH-(aq)}$

Set 2 : $\ce{Al2O3.xH2O(s)}$ and $\ce{H2O(l)}$

Set 3 : $\ce{Al2O3.xH2O(s)}$ and $\ce{H+(aq)}$

Set 4 : $\ce{Al2O3.xH2O(s)}$ and $\ce{NH3(aq)}$

1 and 2

1 and 3

2 and 4

3 and 4

Answer and worked solution

Official answer: B

Amphoteric means it reacts with both bases and acids:

JEE Main 2014 · 9 Apr · Shift 1, Chemistry question 47