Which of the following complexes formed by Cu++ ions is most stable?

1. Cu2+ + 4NH3 → [Cu(NH3)4]2+   logK = 11.6
2. Cu2+ + 4CN- → [Cu(CN)4]2-    logK = 27.3
3. Cu2+ + 2en- → [Cu(en)2]2+     logK =  15 .4
4. Cu2+   +   4H2O → [Cu(H2O)4]2+     logK = 8.9
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The colour of the coordination compounds depends on the crystal field splitting. What will be the correct order of absorption of the wavelength of light in the visible region for the complexes?

\(1. \ \left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}>\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}>\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+} \\ 2. \ \left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}>\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}>\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+} \\ 3. \ \left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}>\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}>\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-} \\ 4. \ \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}>\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}>\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}\)

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The CFSE for octahedral  CoCl64- is 18,000 cm-1 . The CFSE for tetrahedral will be CoCl42-

1. 6000 cm-1

2. 16,000 cm-1

3. 18,000 cm-1

4. 8,000 cm-1

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Atomic number of Mn Fe and Co are 25, 26 and 27 respectively. Which of the following inner orbital octahedral complex ions are diamagnetic?

a. CoNH363+

b. Mn(CN)63-

c.  Fe(CN)64-

d.  FeCN63-

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)

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Identify the outer orbital octahedral complexes among the following that have the same number of unpaired electrons:
(Atomic numbers of Mn, Fe, Co, and Ni are 25, 26, 27, and 28 respectively)

(a) MnCl63-
(b) FeF63-
(c) CoF63-
(d) NiNH362+


1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)

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An aqueous pink solution of cobalt(II) chloride changes to deep blue on addition of excess of HCl. This is because ........

a. CoH2O62+ is transformed into CoCl64-

b. CoH2O62+ is transformed intCoCl42-


c. Tetrahedral complexes have smaller crystal field splitting than octahedral complexes

d. Tetrahedral complexes have larger crystal field splitting than octahedral complex 

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)

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Match the complex ions give in Column I with the colours given in column II and assign the correct code.

               Column I

            (Complex ion)

              Column II

              (Colour)

A. [Co(NH3)6]3+

1. Violet

B. [Ti(H2O)6)]3+

2. Green 

C. Ni(H2O62+

3. Pale blue 

D. Ni(H2O)4(en)2+

4. Yellowish orange

Codes

Options:  A   B   C   D 
1. 2 3 4 1
2. 3 1 5 2
3. 5  4 3 2
4. 4 3 2 1

        

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 Match the complex ions given in Column I with the hybridization and number of unpaired electrons given in Column II and assign the correct code. 

Column l 

Column II

(Hybridisation, number of unpaired electrons)

A. Cr(H2O)63+

1. dsp2, 1

B.Co(CN)42-

2. sp3d2, 5

C.Ni(NH3)62+

3. d2sp3, 3

D.MnF64-

4. sp3d2, 2

Codes 

Options:  A   B   C   D 
1. 2 3 4 1
2. 3 1 4 2
3. 5 4 3 2
4. 4 5 3

       

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Assertion (A): Cr(H2O6)Cl2 and Fe(H2O)6Cl2 are reducing in nature.

Reason (R): Unpaired electrons are present in their d-orbitals.

1.  Both assertion and reason are true and the reason is the correct explanation of assertion.

2.  Both assertion and reason are true and reason is not the correct explanation of assertion.

3.  Assertion is true but the reason is false.

4.  Assertion is false but reason is true.

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Assertion: Fe(CN)63- ion shows magnetic moment corresponding to two unpaired electrons.

Reason: Because it has d2sp3 type hybridization.

1.  Both assertion and reason are true and the reason is the correct explanation of assertion.

2.  Both assertion and reason are true and the reason is not the correct explanation of assertion.

3.  Assertion is true but the reason is false.

4.  Assertion is false but the reason is true.

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