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Ammonia forms the complex ion [Cu(NH3)4]...

Ammonia forms the complex ion `[Cu(NH_3)_4]^(2+)` with copper ions in alkaline solutions but not in acidic solutions. The reason is

A

In acidic solutions hydration protects copper ions

B

In acidic solutions protons coordinate with ammonia molecules forming `NH_4^+` ions and `NH_3` molecules are not available

C

In alkaline solutions insoluble `Cu(OH)_2` is precipitated which is soluble in excess of any alkali

D

Copper hydroxide is an amphoteric substance.

Text Solution

Verified by Experts

The correct Answer is:
B
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Knowledge Check

  • The complex ion [Cu(NH_(3))_(4)]^(2+) has :

    A
    The tetrahedral configuration & one unpaired electron
    B
    Square planar configuration & one unpaired electron
    C
    Square planar & two unpaired electron
    D
    all

  • The bonds present in [Cu(NH_3)_4] SO_4 between copper and ammonia are

    A
    ionic
    B
    covalent
    C
    co-ordinate
    D
    hydrogen

  • Cu^(+) ion is not stable in aqueous solution because

    A
    `Cu_((aq))^(+2)` is more stable than `Cu_((aq))^(+)`
    B
    `Cur_((aq))^(+2)` can form interstitial compounds in aqueous solution
    C
    The equilibrium constant for `Cu_((aq))^(+) hArr Cu_((aq))^(+2) + Cu` is very high
    D
    The equilibrium constant for `Cu_((aq))^(+2) hArr Cu_((aq))^(+2) = Cu` is very low

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