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An inorganic compound (X) shows the foll...

An inorganic compound `(X)` shows the following reactions :
(a) It is white solid, exists as dimer and fumes in moist air.
(b) It sublimes at `180^@ C` and forms monomer on heating to `400^@ C`.
( c) Its aqueous solution turns blue litmus red and gives a white precipitate with `AgNO_(3)` solution which is soluble in excess of `NH_(4) OH`.
(d) Addition of `NaOH` to the solution of `(A)` gives a white gelatinous precipitate which is, however, soluble on excess of `NaOH`.
Identify the compound `(A)`.

A

`AI(OH)_(3)`

B

`AI_(2)CI_(6)`

C

`AI_(2)O_(3)`

D

`AI_(2)(SO_(4))_(3)`

Text Solution

Verified by Experts

The correct Answer is:
B
compound 'A' is `AI_(2)CI_(6)`
(i) `AI_(2)CI_(6)` is a white solid, exists as dimer and fumes in wet air.
(ii) It sublimes at `180^(@)C` and converts into `AICI_(3)` at `400^(@)C`
(iii) Its aqueous solution is acidic, so it turns blue litmus to red.
`AI_(2)CI_(6) + 6H_(2)O to underset("Weak base")(2AI(OH)_(3)) + underset("Strong acid"(6HCI)`
it gives white ppt. with `AgNO_(3)` which is soluble in `NH_(4)OH`.
(iv) `AICI_(3) + 3aOH to underset("white ppt")(AI(OH)_(3)) + 3NaCI`
`AI(OH)_(3) + underset("excess")(NaOH) to underset("Soluble")(NaIO_(2)) + 2H_(2) O`
But in case of `NH_(4)OH`, the ppt. of `Al(OH_(3)` does not dissolve in excess of `NH_(4) OH`
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