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Byju's Answer

Standard IX

Chemistry

Colour

Which of the ...

Question

Which of the following is colourless?

[C u (H_{2} O)_{4}]^{2 +}

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[C u (C N)_{2}]^{-}

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C u (N H_{3})_{4}]^{2 +}

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[C u C l_{4}]^{2 -}

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Solution

The correct option is B $[C u (C N)_{2}]^{-}$
Cu is Cu(I) in $[C u (C N)_{2}]^{-}$ and has $3 d^{9}$ configuration. All others have Cu(II) and $3 d^{10}$ configuration.

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Similar questions

[C u (H_{2} O)_{4}]^{2 -}

[C u (N H_{3})_{4}]^{2 +}

and

[C u C l_{4}]^{2 +}

are called labile complexes.

If true enter 1, else enter 0.

Q. Assertion :

[C u (N H_{3})_{4}]^{2 +}

is coloured while

[C u (C N)_{4}]^{3 -}

is colourless. Reason:

[C u (N H_{3})_{4}]^{2 +}

has

d s p^{2}

hybridisation.

Q. Assertion :Concentrated aqueous solution of

C u {C l}_{2}

is green in colour. Reason: The solution contains two complex ions i.e.,

{[C u {(H_{2} O)}_{4}]}^{2 +}

and

{[{C u C l}_{4}]}^{2 -}

in equilibrium.

[C u (H_{2} O)_{4}]^{2 +} + 4 N H_{3} \to [C u (N H_{3})_{4}]^{2 +} + 4 H_{2} O

is spontaneous in forward side as

Δ G = - v e

If true 1 else 0.

Which of the following complexes formed by $C u^{2 +}$ ions is most stable?
(a) $C u^{2 +} + 4 N H_{3} \to [C u (N H_{3})_{4}]^{2 +}, l o g K = 11.6$
(b) $C u^{2 +} + 4 C N^{-} \to [C u (C N)_{4}]^{2 -}, l o g K = 27.3$
(c) $C u^{2 +} + 2 e n^{-} \to [C u (e n)_{2}]^{2 +}, l o g K = 15.4$
(d) $C u^{2 +} + 4 H_{2} O \to [C u (H_{2} O)_{4}]^{2 +}, l o g K = 8.9$

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Which of the following is colourless?

The correct option is B [Cu(CN)2]−Cu is Cu(I) in [Cu(CN)2]− and has 3d9 configuration. All others have Cu(II) and 3d10 configuration.

The correct option is B $[C u (C N)_{2}]^{-}$
Cu is Cu(I) in $[C u (C N)_{2}]^{-}$ and has $3 d^{9}$ configuration. All others have Cu(II) and $3 d^{10}$ configuration.