Aluminum dissolves in mineral acids and aqueous alkalis and thus shows amphoteric character. A piece of aluminum foil is treated with dilute hydrochloric acid or dilute sodium hydroxide solution in a test tube and on bringing a burning match stick near the mouth of the test tube, a pop sound indicates the evolution of hydrogen gas. The same activity when performed with concentrated nitric acid, reaction doesn't proceed. Explain the reason.
Aluminum dissolves in mineral acids and aqueous alkalis and thus shows amphoteric character. A piece of aluminum foil is treated with dilute hydrochloric acid or dilute sodium hydroxide solution in a test tube and on bringing a burning match stick near the mouth of the test tube, a pop sound indicates the evolution of hydrogen gas. The same activity when performed with concentrated nitric acid, reaction doesn't proceed. Explain the reason.
Aluminum is amphoteric in nature, it reacts with acid and base to give salt and $\mathrm{H}_{2}$ gas. It burns with pop sound.
$2 \mathrm{Al}+6 \mathrm{HCl} \rightarrow 2 \mathrm{AlCl}_{3}+3 \mathrm{H}_{2}$
$2 \mathrm{Al}+\mathrm{NaOH}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow 2 \mathrm{NaAlO}_{2}+3 \mathrm{H}_{2}$
When $\mathrm{Al}$ reacts with conc. $\mathrm{HNO}_{3}$, a thin layer of $\mathrm{Al}_{2} \mathrm{O}_{3}$ on the surface of $\mathrm{Al}$ metal which protect further reaction. This layer is called protective layer.
$2 \mathrm{Al}+6 \mathrm{HNO}_{3} \rightarrow \mathrm{Al}_{2} \mathrm{O}_{3}+6 \mathrm{NO}_{2}+3 \mathrm{H}_{2} \mathrm{O}$
Similar Questions
Discuss the pattern of variation in the oxidation states of
$(i)$ $B$ to $Tl$ and $(ii)$ $C$ to $Pb$.
Discuss the pattern of variation in the oxidation states of
$(i)$ $B$ to $Tl$ and $(ii)$ $C$ to $Pb$.
An aqueous solution of borax is
An aqueous solution of borax is
Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$:
Assertion $A$ : The stability order of +$1$ oxidation state of $\mathrm{Ga}$, In and $\mathrm{Tl}$ is $\mathrm{Ga}<\mathrm{In}<\mathrm{Tl}$.
Reason $R$ : The inert pair effect stabilizes the lower oxidation state down the group.
In the light of the above statements, choose the correct answer from the options given below :
Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$:
Assertion $A$ : The stability order of +$1$ oxidation state of $\mathrm{Ga}$, In and $\mathrm{Tl}$ is $\mathrm{Ga}<\mathrm{In}<\mathrm{Tl}$.
Reason $R$ : The inert pair effect stabilizes the lower oxidation state down the group.
In the light of the above statements, choose the correct answer from the options given below :
- [JEE MAIN 2024]
For the electrolytic refining of aluminium, the three fused layers consist of
Bottom Layer
Middle Layer
Upper Layer
For the electrolytic refining of aluminium, the three fused layers consist of
|
Bottom Layer |
Middle Layer |
Upper Layer |
Write reactions to justify amphoteric nature of aluminium.
Write reactions to justify amphoteric nature of aluminium.