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Aluminium Chloride

A, B and C ar...

Question

A, B and C are three complexes of chromium (III) with the empirical formula $H_{12} O_{6} C l_{3} C r$ . All the three complexes have water and chloride ions as ligands. Complex A does not react with concentrated $H_{2} S O_{4}$ , whereas complexes B and C lose 6.75% and 13.5% of their original weight respectively, on treatment with concentrated $H_{2} S O_{4}$ .

Thus, select the correct statement :

Conductance in these complexes is in order C < B < A.

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EAN and nuclear spin of chromium are identical in each complex.

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Non-reactivity of A with conc.

H_{2} S O_{4}

is due to absence of water molecules outside coordinated sphere.

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All of the above are correct.

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Solution

The correct option is D All of the above are correct.
(A) The molar mass of $H_{12} O_{6} C l_{3} C r$ is 266.5 g/mol. 6.75% of it corresponds to 18 g or 1 water molecule and 13.5% of it corresponds to 36 g or 2 water molecules. These water molecules are present in the ionization sphere.

Compounds A, B and C are represented by the formulae $[C r (H_{2} O)_{6}] C l_{3}$ , $[C r (H_{2} O)_{5} C l] C l_{2} H_{2} O$ and $[C r (H_{2} O)_{4} C l_{2}] C l (H_{2} O)_{2}$ , respectively.

Conductance in these complexes is in order C < B < A. This is the same order in which the charge on the complex ion and the number of chloride ions in the ionization sphere increases.

Hence, the option A is correct.

(B) EAN and nuclear spin of chromium are identical in each complex.
This is because, the total number of primary and secondary valencies are same in these complexes.

Hence, the option B is correct.

(C) Sulphuric acid is strong dehydrating agent. It removes water molecule from ionization sphere but not from coordination sphere.

In the compound A, represented by formula $[C r (H_{2} O)_{6}] C l_{3}$ , no water molecule is present in the ionization sphere.

Hence, no reaction occurs with sulphuric acid. Hence, the option C is correct.

Therefore, correct option is D.

Suggest Corrections

Similar questions

A, B and C are three complexes of chromium (III) with the empirical formula

H_{12} O_{6} C l_{3} C r

. All the three complexes have water and chloride ions as ligands. Complex A does not react with concentrated

H_{2} S O_{4}

, whereas complexes B and C lose 6.75% and 13.5% of their original weight respectively, on treatment with concentrated

H_{2} S O_{4}

Thus, loss in weight on treatment with concentrated

H_{2} S O_{4}

is due to :

A, B

and

C

are three complexes of chromium(III) with the empirical formula:

H_{12} O_{6} C l_{3} C r

. All the three complexes have water and chloride ions as ligands. Complex

A

does not react with concentrated

H_{2} S O_{4}

, whereas complexes

B

and

C

lose

6.75 %

and

13.5 %

of their original weight, respectively, on treatment with concentrated

H_{2} S O_{4}

. If

C

[C r (H_{2} O)_{x} C l_{y}] C l \cdot z H_{2} O,

find the x, y and z.

Q. A, B and C are three complexes of chromium (III) with the emperical formula

C r (H_{2} O)_{6} C l_{3}

. These complexes have either water or water and chloride ions as ligands. Complex A does not react with concentrated

H_{2} S O_{4}

, whereas complexes B and C loose 6.75% and 13.5% of their orignal mass respectively on treatment with conc.

H_{2} S O_{4}

Q. Simplified absorption spectra of three complexes ((i), (ii) and (iii)) of

M^{n +}

ion are provided below; their

λ_{m a x}

values are marked as A, B and C respectively. The correct match between the complexes and their

λ_{m a x}

values is :

(i)

[M (N C S)_{6}]^{(- 6 + n)}

(ii)

[M F_{6}]^{(- 6 + n)}

(iii)

[M (N H_{3})_{6}]^{n +}

Q. An isomer of the complex

C o B r C l_{2} (e n)_{2} (H_{2} O)

, on reaction with concentrated

H_{2} S O_{4}

(dehydrating agent), suffers no loss in weight and on reaction with

A g N O_{3}

solution it gives only white precipitate, which is soluble in

N H_{3}

solution.

The correct formula of the complex is:

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