Coordination and Oxidation Number

Q.

On the treatment of $100\mathrm{ml}$ of $0.1\mathrm{M}$ solution of ${\mathrm{CoCl}}_3.6{\mathrm{H}}_2\mathrm{O}$ with excess ${\mathrm{AgNO}}_3$, $1.2\times {10}^{22}$ions are precipitated. The complex is

1. $\left[\mathrm{Co}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]{\mathrm{Cl}}_3$

2. $\left[\mathrm{Co}{\left({\mathrm{H}}_2\mathrm{O}\right)}_5\mathrm{Cl}\right]{\mathrm{Cl}}_2.{\mathrm{H}}_2\mathrm{O}$

3. $\left[\mathrm{Co}{\left({\mathrm{H}}_2\mathrm{O}\right)}_4{\mathrm{Cl}}_2\right]\mathrm{Cl}.2{\mathrm{H}}_2\mathrm{O}$

4. $\left[\mathrm{Co}{\left({\mathrm{H}}_2\mathrm{O}\right)}_3{\mathrm{Cl}}_3\right].3{\mathrm{H}}_2\mathrm{O}$

Q. Which of the following is the most likely structure of $CrC{l}_3\cdot 6H_{2}O,$ if 1/3 of total chlorine of the compound is precipitated by adding $AgN{O}_3$ to its aqueous solution:

1. $CrC{l}_3\cdot 6H_{2}O$
2. $\left[Cr\right(H_{2}O{)}_{3}C{l}_3\left]\right(H_{2}O{)}_3$
3. $\left[CrC{l}_2\right(H_{2}O{)}_4]Cl\cdot 2H_{2}O$
4. $[CrCl\cdot (H_{2}O{)}_5]C{l}_2\cdot H_{2}O$

Q. Difference in the oxidation number of chromium in $C{r}_2{O}_3$ and $K_{2}C{r}_2{O}_7$ :

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

Q. In the complex $K_{2}Fe\left[Fe\right(CN{)}_6]:$

1. Both $Fe$ atoms are in the same oxidation state
2. Both $Fe$ atoms are in different oxidation state
3. The coordination number of iron is $4$
4. The complex is a high spin complex

Q. The coordination number and oxidation number of X in the following compound is : $\left[X\right(S{O}_4\left)\right(N{H}_3{)}_5]Cl$

1. 10, 3
2. 2, 6
3. 6, 3
4. 6, 4

Q.

On treatment of 100 mL of 0.1M solution of $CoC{l}_3.6H_{2}O$ with excess $AgN{O}_3;1.2\times {10}^{22}$ ions are precipitated. The complex is

1. $\left[Co\right(H_{2}O{)}_6]C{l}_3$
   
2. $\left[Co\right(H_{2}O{)}_{5}Cl]C{l}_2.H_{2}O$
3. $\left[Co\right(H_{2}O{)}_{4}C{l}_2]Cl.2H_{2}O$
4. $\left[Co\right(H_{2}O{)}_{3}C{l}_3].3H_{2}O$

Q. The no. of neutral molecule or negative groups attached to central metal atom in a complex ion is called

1. Atomic no
2. Effective atomic no.
3. Coordination no.
4. Primary valency

Q. The volume (in mL) of 1.0 M $AgN{O}_3$ required for the complete precipitation of chloride ions present in 30 mL of 0.01M solution of $\left[Cr\right(H_{2}O{)}_6]C{l}_3$, as silver chloride is:

1. 0.9
2. 1.0
3. 1.8
4. 2.0

Q. In which of the following complexes, nickel is in the highest oxidation state?

1. $K_4\left[Ni\right(CN{)}_4]$
2. $\left[K_{2}Ni{F}_6\right]$
3. $\left[Ni\right(CO{)}_4]$
4. $\left[Ni\right(CN{)}_4{]}^{2-}$

Q. The charge on the central metal ion in the complex $\left[Ni\right(CO{)}_4]$ is

1. 2
2. 4
3. \N
4. 3

Q. The oxidation state of Fe in brown ring complex is

1. +1
2. +2
3. +3
4. 0

Q. Difference in the oxidation number of chromium in $C{r}_2{O}_3$ and $K_{2}C{r}_2{O}_7$ :

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

Q. The oxidation state of $Mo$ in its oxido-complex species $\left[M{o}_2{O}_4\right(C_2{H}_4{)}_2(H_{2}O{)}_2{]}^{2-}$ is:

1. $+2$
2. $+3$
3. $+4$
4. $+5$

Q. The coordinationno. of Cu in complex $\left[Cu\right(H_{2}O{)}_4{]}^{2+}$ is

1. 4
2. 3
3. 2
4. 1

Q. In the $ZnS$ (Zinc Blende) structure, what would be the distance for the nearest cation $\left(Z{n}^{2+}\right)$ from an anion $\left(S^{2-}\right)$ ?
Here $a$ is the edge cell length.

1. $\frac{a}{4}$
2. $a$
3. $\sqrt{2}a$
4. $\frac{\sqrt{3}a}{4}$

Q. In the $ZnS$ (Zinc Blende) structure, what would be the distance for the nearest cation $\left(Z{n}^{2+}\right)$ from an anion $\left(S^{2-}\right)$ ?
Here $a$ is the edge cell length.

1. $\frac{\sqrt{3}a}{4}$
2. $\frac{a}{4}$
3. $a$
4. $\sqrt{2}a$

Q. $\left[Fe\right(H_{2}O{)}_6{]}^{3\oplus }$ has a magnetic moment of 5.92 BM. Thus hybridization of Fe is

1. $d^{2}s{p}^3$
2. $s{p}^3{d}^2$
3. $ds{p}^2$
4. $s{p}^3$

Q.

Th correct order of the stochiometrics of AgCl formed when $AgN{O}_3$ in excess is treated with the complexes: $CoC{l}_3.6N{H}_3,CoC{l}_3.5N{H}_3,CoC{l}_3.4N{H}_3$ respectively is

1. 1AgCl, 3AgCl, 2AgCl

2. 3AgCl, 1AgCl, 2AgCl

3. 3AgCl, 2AgCl, 1AgCl

4. 2AgCl, 3AgCl, 1AgCl

Q.

The sum of coordination number and oxidation number of the metal M in the complex $\left[M\right(en{)}_2\left(C_2{O}_4\right)]Cl$ (where, en is ethylenediamine) is

1. 9

2. 6

3. 7

4. 8

Q. The coordination no. of Pt in $\left[Pt\right(N{H}_3{)}_{4}C{l}_2{]}^{2+}$ ions is

1. 2
2. 4
3. 6
4. 8

Q. The coordination no. of Pt in $\left[Pt\right(N{H}_3{)}_{4}C{l}_2{]}^{2+}$ ions is

1. 2
2. 4
3. 6
4. 8

Q. Which of the following cannot behave as a ligand

1. $P{H}_3$
2. $N{O}^{\oplus }$
3. $B{F}_3$
4. $B{r}^{\ominus }$

Q. Consider the following and choose the correct option.
Statement -1 :Both $\left[Co\right(ox{)}_3{]}^{3-}and[Co{F}_6{]}^{3-}$ are paramagnetic
Statement 2 :$CoC{l}_3.3N{H}_3$ complex is non conducting.
Statement 3 : The number of all possible isomers for the complex $\left[Pt\right(N{O}_2\left)\right(py\left)\right(OH\left)\right(N{H}_3\left)\right]$ is six
Statement 4: The oxidatation state of iron in brown ring complex $\left[Fe\right(H_{2}O{)}_{5}NO]S{O}_4$ is +2 where $NO$ is $N{O}^{+}$

1. FTFF
2. TTTT
3. FFTF
4. TTTF

Q.

The sum of coordination number and oxidation number of the metal M in the complex $\left[M\right(en{)}_2\left(C_2{O}_4\right)]Cl$ (where, en is ethylenediamine) is

1. 9

2. 6

3. 7

4. 8

Q. The oxidation state of Ni in the compound $K_4\left[Ni\right(CN{)}_4]$ is

1. 0
2. +1
3. +2
4. -1

Q. The Oxidation no. of Cr in $\left[Cr\right(N{H}_3{)}_6]C{l}_3$

1. 8
2. 6
3. 4
4. 3

Q.

On treatment of 100 mL of 0.1M solution of $CoC{l}_3.6H_{2}O$ with excess $AgN{O}_3;1.2\times {10}^{22}$ ions are precipitated. The complex is

1. $\left[Co\right(H_{2}O{)}_6]C{l}_3$
   
2. $\left[Co\right(H_{2}O{)}_{5}Cl]C{l}_2.H_{2}O$
3. $\left[Co\right(H_{2}O{)}_{4}C{l}_2]Cl.2H_{2}O$
4. $\left[Co\right(H_{2}O{)}_{3}C{l}_3].3H_{2}O$

Q. The oxidation state of Ni in the compound $K_4\left[Ni\right(CN{)}_4]$ is

1. 0
2. +1
3. +2
4. -1

Q. Which compound is zero valency metal complex

1. $\left[Cu\right(N{H}_3{)}_4]S{O}_4$
2. $\left[Pt\right(N{H}_3{)}_{2}C{l}_2]$
3. $\left[Ni\right(CO{)}_4]$
4. $K_3\left[Fe\right(CN{)}_6]$

Q. Oxidation state of silver in Tollen’s reagent is

1. 0
2. +1
3. +2
4. 1.5