Chemistry Test 214

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Chemistry Test 214

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Weekly Quiz Competition

Question 1
4 / -1

Among the following which is the strongest oxidising agent?

A
Br₂

B
I₂

C
Cl₂

D
F₂

Solution

The halogen which has higher value of standard reduction potential will be the strongest oxidizing agent. Standard reduction potentials of halogens are positive and decrease from fluorine to iodine. So, F₂ is the strongest oxidizing agent.
Question 2
4 / -1

Which of the following statements is correct with respect to the property of the elements with increase in atomic number in the carbon family?

A
Their metallic character decreases.

B
The stability of +2 oxidation state increases.

C
Their ionisation energy increases.

D
Their atomic size decreases.

Solution

Reluctance in tendency of s-electrons to participate in bonding is called inert pair effect and due to this stability of higher oxidation state increases down the group and that of lower oxidation state increases down the group. Lower oxidation state in carbon family is +2 while higher oxidation state is +4. Thus, stability of +2 oxidation state decreases while that of +4 oxidation state increases.
Question 3
4 / -1

Aluminium oxide is not reduced by chemical reactions since

A
Aluminium oxide is reactive

B
Reducing agents contaminate

C
Aluminium oxide is highly stable

D
The process pollutes the environment

Solution

Aluminium oxide is a highly stable oxide of aluminium. Thus, it is chemically inert. Metal oxides can be reduced to the corresponding metal by using a suitable reducing agent. But the choice of the reducing agent depends upon the reactivity of the metal. If the metal to be produced is a very reactive metal like alkali metals, alkaline earth metals and aluminium, then the reduction of the oxide can be done by only the electrolytic method.

The oxides of less reactive metals like zinc, iron etc. are reduced by a number of reducing agents like carbon or coke or carbon monoxide.

This is why aluminium is extracted from its ore bauxite by electrolytic reduction. The bauxite ore is first converted into alumina which is then converted into aluminium by the electrolysis of mixture of alumina and cryolite via the Hall and Heroult process.
Question 4
4 / -1

The basicity of H₃PO₄ may be

A
1

B
2

C
3

D
4

Solution

From the structure it is clear that it has 3 P - OH bonds which can produce three H+ ions per molecule of H₃PO₄ in aqueous solution. Hence, basicity is three.
Question 5
4 / -1

On heating a mixture of NH₄Cl and KNO₂, what is the gas obtained?

A
N₂O₂

B
N₂

C
N₂O

D
NO

Solution

Ammonium chloride reacts with potassium nitrite to produce nitrogen gas, potassium chloride and water.
Question 6
4 / -1

The IUPAC name of the complex- [Ag(H2O)₂][Ag(CN)₂] is:

A
dicyanidosilver(II) diaquaargentate(II)

B
diaquasilver(II) dicyanidoargentate(II)

C
dicyanidosilver(I) diaquaargentate(I)

D
diaquasilver(I) dicyanidoargentate(I)

Solution

[Ag(H₂O)₂][Ag(CN)₂]

IUPAC name : diaquasilver(I)dicyanidoargentate(I)
Question 7
4 / -1

Ethylene diamine tetraacetate (EDTA) ion is :

A
Hexadentate ligand with four "O" and two "N" donor atoms

B
Unidentate ligand

C
Bidentate ligand with two "N" donor atoms

D
Tridentate ligand with three "N" donor atoms

Solution

Ethylene diamine tetraacetate (EDTA) ion is a hexadented ligand having four donor oxygen atoms and two donor nitrogen atoms
Question 8
4 / -1

Which of the following is the correct order of increasing field strength of ligands to form coordination compounds?

A
SCN^-< F⁻ < CN⁻ < C₂O₄²

B
F⁻ < SCN⁻ < C₂O₄²⁻ < CN⁻

C
CN− < C₂O₄²⁻

D
SCN⁻ < F⁻ < C₂O₄²⁻ < CN⁻

Solution

According to spectrochemical series, the order of ligand field strength is
Question 9
4 / -1

The crystal field stabilisation energy (CFSE) for [CoCl⁶]⁴⁻ is 18000cm⁻¹. The CFSE for [CoCl₄]²⁻ will be

A
6000cm⁻¹

B
16000cm⁻¹

C
18000cm⁻¹

D
8000cm⁻¹

Solution
Question 10
4 / -1

The geometry and magnetic behaviour of the complex [Ni(CO)₄] are

A
square planar geometry and diamagnetic

B
tetrahedral geometry and diamagnetic

C
square planar geometry and paramagnetic

D
tetrahedral geometry and paramagnetic.

Solution

Thus, the complex is sp³ hybridised with tetrahedral geometry and diamagnetic in nature.

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Chemistry Test 214

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Question 1

Br2

I2

Cl2

F2

Solution

Question 2

Their metallic character decreases.

The stability of +2 oxidation state increases.

Their ionisation energy increases.

Their atomic size decreases.

Solution

Question 3

Aluminium oxide is reactive

Reducing agents contaminate

Aluminium oxide is highly stable

The process pollutes the environment

Solution

Question 4

1

2

3

4

Solution

Question 5

N2O2

N2

N2O

NO

Solution

Question 6

dicyanidosilver(II) diaquaargentate(II)

diaquasilver(II) dicyanidoargentate(II)

dicyanidosilver(I) diaquaargentate(I)

diaquasilver(I) dicyanidoargentate(I)

Solution

Question 7

Hexadentate ligand with four "O" and two "N" donor atoms

Unidentate ligand

Bidentate ligand with two "N" donor atoms

Tridentate ligand with three "N" donor atoms

Solution

Question 8

SCN-< F− < CN− < C2O42

F− < SCN− < C2O42− < CN−

CN− < C2O42−

SCN− < F− < C2O42− < CN−

Solution

Question 9

6000cm−1

16000cm−1

18000cm−1

8000cm−1

Solution

Question 10

square planar geometry and diamagnetic

tetrahedral geometry and diamagnetic

square planar geometry and paramagnetic

tetrahedral geometry and paramagnetic.

Solution

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Br₂

I₂

Cl₂

F₂

N₂O₂

N₂

N₂O

SCN^-< F⁻ < CN⁻ < C₂O₄²

F⁻ < SCN⁻ < C₂O₄²⁻ < CN⁻

CN− < C₂O₄²⁻

SCN⁻ < F⁻ < C₂O₄²⁻ < CN⁻

6000cm⁻¹

16000cm⁻¹

18000cm⁻¹

8000cm⁻¹