First slide

Uses of Boron & Aluminium

Question

An inorganic compound 'A' shows the following reactions
i) It is white solid, exists as dimer and fumes in wet air
ii) It sublimes at 180⁰C and forms monomer if heated to 4000C
iii) Its aqueous solution turns blue litmus to red and gives a white precipitate with AgNO₃ solution which is soluble in NH₄OH
iv) Addition of NH₄OH and NaOH separately to the soltion of 'A' gives a gelatinous precipitate which in however soluble in excess of NaOH.
The compound 'A' is

Moderate

A

Al(OH)₃
B

Al₂Cl₆
C

Al₂O₃
D

Al₂(SO₄)₃

Solution

$I) \underset{\underset{white solid}{Monomer}}{2 {AlCl}_{3}} ⇌ \underset{Dimer}{{Al}_{2} {Cl}_{6}} {AlCl}_{3} + 3 H_{2} O \to Al {(OH)}_{3} + \underset{Dense fumes}{3 HCl}$
$II)\,A{l_2}C{l_6}_{_{(S)}}\xrightarrow[{Sub\lim ation}]{{{{180}^0}c}}A{l_2}C{l_6}_{_{(g)}}\xrightarrow[{{{400}^0}c}]{}\mathop {2AlC{l_3}}\limits_{Monomer}$

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