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Standard IX

Chemistry

Ions

CuI2 is unsta...

Question

$C u I_{2}$ is unstable even at ordinary temperature because:

the

C u^{2 +}

ion with a comparatively small radius has a strong polarising power

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the

C u^{2 +}

ion with a

17

electrons outer shell has weak polarising power

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the

I^{-}

ion with a larger radius has a high polarisability

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both (A) and (C)

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Solution

The correct option is D both (A) and (C)
$C u I_{2}$ is unstable at room temperature as $C u^{2 +}$ ion has small radius and has strong polarising power but $I^{-}$ is a large ion. It has large radius and high polarisability which causes steric hindrance.

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Similar questions

Q. Assertion :Copper (II) iodide is unstable even at ordinary temperature. Reason: The

C u^{2 +}

ion with a 17-electron outer-shell and a comparatively small radius (0.08 nm) has a strong polarising power, while the iodide ion with a larger radius (r = 0.22 nm) has a high polarisability. Hence, the polarisation of the

I^{-}

by the

C u^{2 +}

leads to the complete transition of an electron from the anion to the cation. The

C u^{2 +}

ion is thus reduced to

C u

ion and

I^{-}

is oxidised to free iodine. The compound

C u I_{2}

therefore, does not exist.

2 C u I_{2} ⟶ 2 C u I + I_{2}

2 I^{-} ⟶ I_{2} + 2 e^{-}

C u^{2 +} + 2 e^{-} ⟶ C u

Q. The polarising action of

C d^{2 +}

ion over anions is stronger than that of

C a^{2 +}

because:

Q. Statement I: The fluoride ion has a larger radius than the fluorine atom.
Statement II: The fluoride ion has

8

electrons and

9

protons.

C u^{2 +}

has a stronger polarising power than that of

C a^{2 +}

because :

Q. A small conducting spherical shell with inner radius

a

and outer radius

b

is concentric with a larger conducting spherical shell with inner radius

c

and outer radius

d

(as shown in Fig). The inner shell has total charge

+ 2 q

and the outer shell has charge

+ 4 q

. Calculate the electric field in terms of

q

and the distance

r

from the common centre of the two shells for:

c < r < d

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CuI2 is unstable even at ordinary temperature because:

The correct option is D both (A) and (C)CuI2 is unstable at room temperature as Cu2+ ion has small radius and has strong polarising power but I− is a large ion. It has large radius and high polarisability which causes steric hindrance.

$C u I_{2}$ is unstable even at ordinary temperature because:

The correct option is D both (A) and (C)
$C u I_{2}$ is unstable at room temperature as $C u^{2 +}$ ion has small radius and has strong polarising power but $I^{-}$ is a large ion. It has large radius and high polarisability which causes steric hindrance.