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An aqueous of a gas (X) shows the follow...

An aqueous of a gas `(X)` shows the following reactions :
(a) It turns red litmus blue.
(b) When added in excess to a copper sulphate solution, a deep blue coloured solution is obtained.
( c) On addition to `FeCl_3` solution, a brownish precipitate is formed, which is solution in `HNO_3`.
Identify `(X)` and give an explanation for step `(a),(b)` and `( c)`.

Text Solution

Verified by Experts

The gas `(X)` is ammonia, `NH_3`.
(a) Aqueous solution of `NH_3` is `NH_4 OH`, which is basic and hence truns red litmus blue.
(b) `CuSO_4 + underset (Excess) (4NH_4 OH) rarr underset ("Tetraamminecopper (II) sulphate")([Cu(NH_3)_4]^(2+) SO_4^(2-)) + 4 H_2 O`
`[Cu(NH_3)_4] SO_4` is deep blue in colour and is soluble in water, hence deep blue coloured solution is formed.
( c) `FeCl_3 + 3NH_4OH rarr underset ("Brownish ppt.") (Fe(OH)_3 darr) + 3 NH_4 Cl`
`Fe(OH)_3+ 3HNO_3 rarr underset ("Solution") (Fe(NO_3)_3) + 3 H_2 O`
On addition of `NH_4OH` to `FeCl_3` solution, brown ppt. of ferric hydroxide, `Fe(OH)_3` is formed. `Fe(OH)_3` dissolves in `HNO_3` due to formation of ferrcnitrate, `Fe(NO_3)_3`.
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Knowledge Check

  • When NH_4OH is added to copper sulphate solution, blue colour is obtained due to formation of

    A
    `Cu(NH_3)_4 SO_4`
    B
    `Cu(NH_3 SO_4)_2`
    C
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    D
    `CuO`

  • On mixing aqueous solution of copper sulphates with aqueous solution of ammonia a deep blue coloured solution is obtained. Choose the correct options :

    A
    The blue coloured solution shows presence of `Cu^(2+)` ions
    B
    The blue coloured solution does not show presence of `Cu^(2+)` ions
    C
    The blue coloured solution shows the presence of `[Cu(NH_(3))_(4)]^(2+)` ions
    D
    The blue coloured solution does not show the presence of `[Cu(NH_(3))_(4)]^(2+)` ions

  • Which of the following oxides in aqueous solution does not turn red litmus blue?

    A
    `CO_2`
    B
    `Na_2 O`
    C
    `MgO`
    D
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