Chemistry Test 215

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Chemistry Test 215

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Weekly Quiz Competition

Question 1
4 / -1

An example of a sigma bonded organometallic compound is

A
Grignard's reagent

B
ferrocene

C
cobaltocene

D
ruthenocene.

Solution

An example of a sigma bonded organometallic compound is grignard's reagent. Grignard's reagent is represented by R−MgX. An example is methyl magnesium iodide. A sigma bond is present between C atom and Mg atom.
Question 2
4 / -1

The correct increasing order of trans-effect of the following species is

A
NH₃ > CN⁻ >Br⁻ > C₆H₅⁻

B
CN⁻ > C₆H₅⁻ > Br⁻ > NH₃

C
Br⁻ > CN⁻ > NH₃ > C₆H₅⁻

D
CN⁻ > Br⁻ > C₆H₅⁻ > NH₃

Solution

The intensity of the trans-effect (as measured by the increase in rate of substitution of the trans ligand follows the sequence

CN⁻ > C₆H₅⁻ > Br⁻ > NH₃
Question 3
4 / -1

Which of the following has longest C−O bond length? (Free C−O bond length in CO is 1.128Å.)

A
[Fe(CO)₄]²⁻

B
[Mn(CO)₆]⁺

C
Ni(CO)4

D
[Co(CO)₄]⁻

Solution

The greater the negative charge on the carbonyl complex, the more easy it would be for the metal to permit its electrons to participate in the back bonding, the higher would be the M−C bond order and simultaneously there would be larger reduction in the C−O bond order. Thus, [Fe(CO)₄]²⁻ has the lowest C−O bond order means the longest bond length.
Question 4
4 / -1

The name of complex ion, [Fe(CN)₆]³⁻ is

A
hexacyanitoferrate (III) ion

B
tricyanoferrate (III) ion

C
hexacyanidoferrate (III) ion

D
hexacyanoiron (III) ion.

Solution

The name of complex ion, [Fe(CN)₆]³⁻ is “hexacyanidoferrate (III) ion”
Question 5
4 / -1

Number of possible isomers for the complex [Co(en)₂Cl₂]Cl will be (en = ethylenediamine)

A
1

B
3

C
4

D
2

Solution
Question 6
4 / -1

Blister copper is refined by stirring molten impure metal with green logs of wood because such a wood liberates hydrocarbon gases (like CH₄ ). This process X is called ________ and it is used to purify the metal that initially contain impurities of Y. Y is _______.

A
X = poling, Y = CuO₂

B
X = cupellation, Y = CuO

C
X = cupellation, Y = ZnO

D
X = poling, Y = Cu₂O

Solution

Poling is a purification process which is used for metals which contains their own oxide as impurity.
Question 7
4 / -1

The function of flux during smelting of ores is to

A
Make the ore porous

B
Remove gangues

C
Facilitate reduction

D
Precipitate slag

Solution

In the process of smelting of ores flux is added to promote fluidity and it also removes impurities by converting them into slag
Question 8
4 / -1

The coordination number of a central metal atom in a complex is determined by

A
the number of ligands around a metal ion bonded by sigma and pi-bonds both

B
the number of ligands around a metal ion bonded by sigma bonds

C
the number of ligands around a metal ion bonded by pi-bonds

D
the number of only anionic ligands bonded to the metal ion.

Solution

The coordination number of central metal atom in a complex is equal to number of monovalent ligands, twice the number of bidentate ligands and so on, around the metal ion bonded by coordinate bonds.

Hence coordination number = no. of a bonds formed by metals with ligands
Question 9
4 / -1

The element w hich shows least metallic character is

A
Indium

B
Boron

C
Aluminium

D
Gallium
Solution
The element which shows the least metallic character is: Boron
- Metallic character decreases across a period from left to right.
- Boron is in group 13 and is the first element in this group, making it the least metallic compared to Indium, Aluminium, and Gallium.
- It has high ionization energy and small atomic size, contributing to its non-metallic nature.
Question 10
4 / -1

Some salts although containing two different metallic elements give test for only one of them in solution. Such salts are

A
complex

B
double salts

C
normal salts

D
None of these

Solution

Salt may be complex salt. Metal atom present in the coordination sphere appears in the form of complex ion and not as simple cation

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Chemistry Test 215

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Question 1

Grignard's reagent

ferrocene

cobaltocene

ruthenocene.

Solution

Question 2

NH3 > CN− >Br− > C6H5−

CN− > C6H5− > Br− > NH3

Br− > CN− > NH3 > C6H5−

CN− > Br− > C6H5− > NH3

Solution

Question 3

[Fe(CO)4]2−

[Mn(CO)6]+

Ni(CO)4

[Co(CO)4]−

Solution

Question 4

hexacyanitoferrate (III) ion

tricyanoferrate (III) ion

hexacyanidoferrate (III) ion

hexacyanoiron (III) ion.

Solution

Question 5

1

3

4

2

Solution

Question 6

X = poling, Y = CuO2

X = cupellation, Y = CuO

X = cupellation, Y = ZnO

X = poling, Y = Cu2O

Solution

Question 7

Make the ore porous

Remove gangues

Facilitate reduction

Precipitate slag

Solution

Question 8

the number of ligands around a metal ion bonded by sigma and pi-bonds both

the number of ligands around a metal ion bonded by sigma bonds

the number of ligands around a metal ion bonded by pi-bonds

the number of only anionic ligands bonded to the metal ion.

Solution

Question 9

Indium

Boron

Aluminium

Gallium

Solution

Question 10

complex

double salts

normal salts

None of these

Solution

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NH₃ > CN⁻ >Br⁻ > C₆H₅⁻

CN⁻ > C₆H₅⁻ > Br⁻ > NH₃

Br⁻ > CN⁻ > NH₃ > C₆H₅⁻

CN⁻ > Br⁻ > C₆H₅⁻ > NH₃

[Fe(CO)₄]²⁻

[Mn(CO)₆]⁺

[Co(CO)₄]⁻

X = poling, Y = CuO₂

X = poling, Y = Cu₂O