Calculate the effective atomic number (e.a.n) of copper in Cu NH 3 4 2 + [ Z of Cu = 29 ] Explain ionisation isomerism in coordination compounds with a suitable example.

Effective atomic number represents the total number of electrons present around the central metal ion. It can be calculated by using the formula: EAN = Atomic number - Oxidation state of central atom + No . of electrons donated by ligand EAN Cu NH 3 4 2 + = 29 - 2 + 4 × 2 = 35 Therefore, effective atomic number of Cu NH 3 4 2 + is 35 . Ionization isomerism is a type of isomerism which arises when the counter ion in a complex salt is itself a potential ligand and can displace a ligand which can then become the counter ion. Examples, Co NH 3 5 SO 4 Br Co NH 3 5 Br SO 4

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Which has maximum EAN of the underlined atoms ?

(Cr = 24, Co = 27, Fe = 26, Ni = 28 )

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Important Questions on Coordination Compounds

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Chemistry>Inorganic Chemistry>Coordination Compounds>Effective atomic number

The correct order of the stoichiometries of

AgCl

formed when

{AgNO}_{3}

is treated in excess with the complexes:

{CoCl}_{3} . 6 {NH}_{3}, {CoCl}_{3} . 5 {NH}_{3}, {CoCl}_{3} . 4 {NH}_{3}

, respectively, is:

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Chemistry>Inorganic Chemistry>Coordination Compounds>Effective atomic number

2.33

g of compound

X

(empirical formula

{CoH}_{12} N_{4} {Cl}_{3}

) upon treatment with excess

{AgNO}_{3}

solution produces

1 .435 g

of white precipitate. The primary and secondary valencies of cobalt in compound

X,

respectively, are

[Given: Atomic mass:

C o = 59, C l = 35.5, A g = 108]

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Chemistry>Inorganic Chemistry>Coordination Compounds>Effective atomic number

The number of ions produced in water by dissolution of the complex having the empirical formula,

{CoCl}_{3} 4 {NH}_{3},

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Chemistry>Inorganic Chemistry>Coordination Compounds>Effective atomic number

According to Werner’s theory the geometry of the complex is determined by

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Chemistry>Inorganic Chemistry>Coordination Compounds>Effective atomic number

The

EAN

value

[Ti {(σ - C_{6} H_{5})}_{2} {(π - C_{5} H_{5})}_{2}] °

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Chemistry>Inorganic Chemistry>Coordination Compounds>Effective atomic number

The volume $(i n m L)$ of $0.125 M {A g N O}_{3}$ required to quantitatively precipitate chloride ions in $0.3 g$ of $[C o {(N H_{3})}_{6}] C l_{3}$ is __________.
${}^{M}{[C o {(N H_{3})}_{6}]} C l_{3} = 267.46 g / m o l$
${}^{M}{A g N O}_{3} = 169.87 g / m o l$

Report the nearest integer as the answer.

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Chemistry>Inorganic Chemistry>Coordination Compounds>Effective atomic number

On treatment of

100 mL

0.1 M

solution of

{CoCl}_{3} . 6 H_{2} O

with excess

{AgNO}_{3}; 1 .2 \times 10^{22}

ions are precipitated. The complex is:

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Effective atomic number

A d-block metal

M

forms two complexes with the formulae

{MCl}_{4} . 2 HCl

and

{MCl}_{2} . 2 {NH}_{3}

. When excess of

A g N O_{3}

solution is added to

1

mole of each complex,

A g C l

precipitate is not formed. The secondary valency of metal

M

in the complexes is respectively

EASY

Chemistry>Inorganic Chemistry>Coordination Compounds>Effective atomic number

Identify complex ion in which effective atomic number of the central metal ion is

35

(

Given At. Number of

Co = 27, Fe = 26, Zn = 30)

HARD

Chemistry>Inorganic Chemistry>Coordination Compounds>Effective atomic number

Calculate the effective atomic number (e.a.n) of copper in

{[Cu {({NH}_{3})}_{4}]}^{2 +}

[Z

Cu = 29]

Explain ionisation isomerism in coordination compounds with a suitable example.

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Chemistry>Inorganic Chemistry>Coordination Compounds>Effective atomic number

Addition of excess of ${AgNO}_{3}$ to an aqueous solution of $1$ mole of ${PdCl}_{2} \cdot 4 {NH}_{3}$ gives $2$ moles of $AgCl$ . The conductivity of this solution corresponds to:

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Effective atomic number

What is effective atomic number of

Fe

{[Fe {(CN)}_{6}]}^{4 -}

(At. no. of

Fe = 26

)

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Chemistry>Inorganic Chemistry>Coordination Compounds>Effective atomic number

A colorless aqueous solution contains nitrates of two metals,

X

and

Y

. When it was added to an aqueous solution of

NaCl

, a white precipitate was formed. This precipitate was found to be partly soluble in hot water to give a residue

P

and a solution

Q

. The residue

P

was soluble in aq.

{NH}_{3}

and also in excess sodium thiosulfate. The hot solution

Q

gave a yellow precipitate with

KI

. The metals

X

and

Y

, respectively, are

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Effective atomic number

Which one of the following complexes will consume more equivalents of aqueous solution of

{AgNO}_{3}

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Chemistry>Inorganic Chemistry>Coordination Compounds>Effective atomic number

Which of the following types of valences, according to Werner's theory, is also called as primary valence ?

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Chemistry>Inorganic Chemistry>Coordination Compounds>Effective atomic number

Primary valency of

Co

[Co {(en)}_{2} {Cl}_{2}] Cl

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Chemistry>Inorganic Chemistry>Coordination Compounds>Effective atomic number

The conductivity measurement of a coordination compound of cobalt (III) shows that it dissociates into 3 ions in solution. The compound is

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Chemistry>Inorganic Chemistry>Coordination Compounds>Effective atomic number

Cobalt (III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test for chloride ions with silver nitrate at

25^{o} C

MEDIUM

Chemistry>Inorganic Chemistry>Coordination Compounds>Effective atomic number

Which of the following complex ions is most stable?

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Chemistry>Inorganic Chemistry>Coordination Compounds>Effective atomic number

Which of the following co-ordinate complexes is an exception to EAN rule?

(Given At. Number Pt = 78, Fe = 26, Zn = 30, Cu = 29)

Which has maximum EAN of the underlined atoms ? (Cr = 24, Co = 27, Fe = 26, Ni = 28 )

Important Questions on Coordination Compounds

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Which has maximum EAN of the underlined atoms ?

(Cr = 24, Co = 27, Fe = 26, Ni = 28 )