The d- and f- Block Elements Test

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The d- and f- Block Elements Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following methods is based on distribution law?

A
Poling process

B
Cupellation process

C
Parkes process

D
Mond’s process

Solution

The parkes process is for removing silver from lead. It is an example of liquid-liquid extraction.
Question 2
1 / -0

How many d–block elements have ability to evolve hydrogen gas from 2% nitric acid?

A
1

B
2

C
3

D
Many

Solution

Both Zn and Fe can displace Hydrogen from HNO₃.
Question 3
1 / -0

Haemoglobin and chlorophyll contain

A
Mg and Fe

B
Fe and Mg

C
Fe and Mn

D
Fe and Co

Solution

Haemoglobin contains Fe and Chlorophyll contains Mg.
Question 4
1 / -0

The product of oxidation of I^– with MnO₄^- in acidic medium is

A
IO₃^-

B
IO₄^-

C
I₂

D
IO^-

Solution

Iodine is liberated from potassium iodide.
10I^- + 2MnO₄^- + 16H^+→ 2Mn²⁺+ 8H₂O + 5I₂
Question 5
1 / -0

In dilute alkaline solution, MnO₄^- changes to

A
Mn₂O₃

B
MnO

C
MnO₂

D
MnO₄^2-

Solution

In alkaline medium, reduction of MnO₄^- take place to form MnO_2. The chemical equation for this change is given below as:
MnO₄^-(aq) + 2H₂O(l) + 3e^- → MnO₂(s)+ 4OH^-(aq)
Question 6
1 / -0

Among the following, which bivalent ion of the first transition series shows maximum magnetic moment ?

A
Fe²⁺

B
Mn²⁺

C
Ni²⁺

D
Co²⁺

Solution

Mn²⁺ has d⁵ configuration so maximum number of unpaired electrons and hence maxium magnetic moment. This magnetic moment can be calculated by using the spin only formula: μso = ∠n(n + 2), where n = number of unpaired electrons.
Question 7
1 / -0

Which is called chromic acid?

A
Cr₃O₄

B
Cr₂O₃

C
CrO

D
H₂CrO₄

Solution

H₂CrO₄is chromic acid. It is actually formed by mixing concentrated sulphuric acid to a dichromate like sodium dichromate. It is a strong acid as it completely dissociates into H⁺ions.

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Re-Attempt Weekly Quiz Competition

The d- and f- Block Elements Test - 6

Result

The d- and f- Block Elements Test - 6

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SHARING IS CARING

Question 1

Poling process

Cupellation process

Parkes process

Mond’s process

Solution

Question 2

1

2

3

Many

Solution

Question 3

Mg and Fe

Fe and Mg

Fe and Mn

Fe and Co

Solution

Question 4

IO3-

IO4-

I2

IO-

Solution

Question 5

Mn2O3

MnO

MnO2

MnO42-

Solution

Question 6

Fe2+

Mn2+

Ni2+

Co2+

Solution

Question 7

Cr3O4

Cr2O3

CrO

H2CrO4

Solution

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IO₃^-

IO₄^-

I₂

IO^-

Mn₂O₃

MnO₂

MnO₄^2-

Fe²⁺

Mn²⁺

Ni²⁺

Co²⁺

Cr₃O₄

Cr₂O₃

H₂CrO₄