| Set \[1:A{{l}_{2}}{{O}_{3}}.x{{H}_{2}}O(s)\]and \[O{{H}^{-}}(aq)\] |
| Set \[2:A{{l}_{2}}{{O}_{3}}.x{{H}_{2}}O(s)\]and \[{{H}_{2}}O(l)\] |
| Set \[3:A{{l}_{2}}{{O}_{3}}.x{{H}_{2}}O(s)\]and \[{{H}^{+}}(aq)\] |
| Set \[4:A{{l}_{2}}{{O}_{3}}.x{{H}_{2}}O(s)\]and \[N{{H}_{3}}(aq)\] |
A) \[1 and 2\]
B) \[1 and 3\]
C) \[2 and 4\]
D) \[3 and 4\]
Correct Answer: B
Solution :
Aluminium oxide is amphoteric oxide because it shows the properties of the both acidic and basic oxides. It reacts with both acids and bases to form salt and water. \[A{{l}_{2}}{{O}_{3}}.x{{H}_{2}}O+2NaOH\xrightarrow[{}]{{}}NaAl{{O}_{2}}+{{H}_{2}}O\] \[A{{l}_{2}}{{O}_{3}}.x{{H}_{2}}O+HCl\xrightarrow[{}]{{}}AlC{{l}_{3}}+{{H}_{2}}O\]
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