Coordination Complexes

Q. The correct option for the number of body centred unit cells in all $14$ types of Bravais lattice unit cells is :

1. $3$
2. $7$
3. $5$
4. $2$

Q.

Write two examples of each of the following:

(iii) Double salts

Q.

What is meant by the stability of a coordination compound in solution? State the factors which govern the stability of complexes.

Q.

The correct order of the calculated spin-only magnetic moments of complexes A to D is:

(A) $\mathrm{Ni}{\left(\mathrm{CO}\right)}_4$
(B) $[\mathrm{Ni}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6]{\mathrm{Cl}}_2$
(C) ${\mathrm{Na}}_2\left[\mathrm{Ni}{\left(\mathrm{CN}\right)}_4\right]$
(D) ${\mathrm{PdCl}}_2{\left({\mathrm{PPh}}_3\right)}_2$

1. (C) < (D) < (B) < (A)

2. (A) ≈ (C) ≈ (D) < (B)

3. (A) ≈ (C)<(B) ≈ (D)

4. (C) ≈ (D) < (B) < (A)

Q.

All the transition elements are d-block elements but all d-block elements are not transition elements. Justify

Q.

Jahn-Teller effect is not observed in high spin complexes of

1. ${\mathrm{d}}^4$

2. ${\mathrm{d}}^9$

3. ${\mathrm{d}}^{10}$

4. ${\mathrm{d}}^7$

Q. Which of the statement regarding 3-D bcc closed packing is correct?

1. Spheres in first layer are touching each other.
2. Sphere in second layer is placed at hollow space of layer 1
3. Arrangement of third layer is different to that of first layer
4. All of the above.

Q. Which of the following statements regarding hexagonal closed packing in 2D is correct?

1. The coordination number of hcp in 2-D is 6
2. ABAB... pattern gives hexagonal closed packing in 2-D
3. Triangular shape empty spaces or voids are present in hcp
4. All of the above

Q.

Why is ${\mathrm{KO}}_2$ paramagnetic?

Q. Stacking of square packed layers/sheets exactly above one another gives

1. AAA.. pattern of arrangement
2. Simple cubic unit cell
3. Both (a) and (b)
4. hexagonal unit cell

Q. The EAN of metal atoms in $\left[Fe\right(CO{)}_2\left(N{O}^{+}{)}_2\right]$ and $C{o}_2(CO{)}_8$ respectively are:
(correct answer +2, wrong answer -0.5)

1. $34,36$
2. $36,36$
3. $36,35$
4. $34,35$

Q.

An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave C= 38.71% and H= 9.67%. What would be the empirical formula of the compound?

1. CHO

2. CH₂O

3. CH₃O

4. CH₄O

Q.

Indicate the σ and π bonds in the following molecules:

C₆H₆, C₆H₁₂, CH₂Cl₂, CH₂ = C = CH₂, CH₃NO₂, HCONHCH₃

Q. Sandmeyer reaction is better than Gattermann reaction because:

1. Sandmeyer reaction uses salt of copper while Gattermann reaction uses copper powder
2. Only one salt is produced in Sandmeyer reaction while Gattermann rection produces two salts
3. Sandmeyer reaction gives better yield than Gattermann reaction
4. All of the above

Q.

Write down the formula of sodium sulphate using the Criss cross method.

Q. Choose the correct statement for 3-D hexagonal closed packing :

1. Third layer is covering the octahedral voids of second layer
2. First layer is identical to the third layer
3. Spheres of the fourth layer are exactly aligned with those of the first layer.
4. All of the above.

Q. How many rings are present in ${\left[\text{MEDTA}\right]}^{+n}$ ?

Q. Identical spheres undergo two-dimensional packing to give square close packing (scp) and hexagonal close packing (hcp). Which of the following statements is correct?

1. The ratio of coordination number for a sphere in scp to that of hcp is 1 : 3
2. The ratio of coordination number for a sphere in scp to that of hcp is 3 : 2
3. The centres of the neighboring spheres in hcp join to form a hexagon
4. The centres of the neighboring spheres in scp form a simple cubic structure

Q.

In the complex $[\mathrm{Ni}{\left({\mathrm{H}}_2\mathrm{O}\right)}_2{\left({\mathrm{NH}}_3\right)}_4{]}^{2+}$ the no. of unpaired electrons is

Q. Which of the following metal ion is present in Ziegler-Natta catalyst?

1. $F{e}^{2+}$
2. $Z{r}^{4+}$
3. $R{h}^{+1}$
4. $T{i}^{4+}$

Q. EAN of cobalt is 36 in knowing that atomic number of Co is 27, is present as

1. Oxide ion
2. Superoxide ion
3. Peroxide ion
4. Dioxide ion

Q.

Explain with two examples each of the following:
Coordination entity, ligand, coordination number, coordination polyhedron, homoleptic and heteroleptic.

Q. The d-orbitals involved in $ds{p}^2$ hybridization is-

1. d_xy
2. d_z²
3. d _x²_{- y}²
4. d_zx

Q. Which of the following statements regarding close packing is correct?

1. In 1D, efficient packing is when spheres does not touch each other.
2. In 2-D, ABAB... type arrangement gives square close packing
3. The coordination number of square close packing in 2-D is 8
4. Particles are assumed as identical sphere in measuring packing efficiency

Q. Identical spheres undergo two-dimensional packing to give square close packing (scp) and hexagonal close packing (hcp). Which of the following statement(s) is/are correct?

1. The ratio of coordination number for a sphere in scp to that of hcp is 2 : 3.
2. The ratio of coordination number for a sphere in scp to that of hcp is 3 : 2.
3. The centres of the neighboring spheres in hcp join to form a hexagon
4. The centres of the neighboring spheres in scp form a simple cubic structure

Q.

What is the coordination number of copper in ${\left[\mathrm{Cu}{\left({\mathrm{NH}}_3\right)}_4\right]}^{2+}$.

Q. Which of the following complex ion is expected to absorb light in the visible region ?

1. $\left[Ti\right(en{)}_3{]}^{4+}$
2. $\left[Sc\right(N{H}_3{)}_4(H_{2}O{)}_2{]}^{3+}$
3. $\left[Cr\right(N{H}_3{)}_6{]}^{3+}$
4. $\left[Zn\right(CN{)}_2{]}^{2-}$

Q.

How many ions are produced from the complex, $\left[Co\right(N{H}_3{)}_{6}C{l}_2]$ in solution?

Q. What is the maximum hapticity of cyclopentadienyl​ group?

1. 5
2. 6
3. 3
4. 2

Q. The number of sigma and pi bonds in the compound respectively are

1. 19, 11
2. 19, 5
3. 35
4. 7, 3