The d- and f- Block Elements Test

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The d- and f- Block Elements Test - 33

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Weekly Quiz Competition

Question 1
1 / -0

The only radioactive element among the lanthanoids is:

A
gadolinium

B
holmium

C
promethium

D
neodynium

Solution

Promethium is a lanthanoid element with the symbol Pm and atomic number 61. All of its isotopes are radioactive. Gadolinium, holmium and neodynium are lanthanoids but are not radio active.
Question 2
1 / -0

Which of the following weights less when weighted in magnetic field?

A
$$Sr{ Cl }_{ 3 }$$

B
$$Fe{ Cl }_{ 3 }$$

C
$$Ti{ Cl }_{ 3 }$$

D
$$V{ Cl }_{ 3 }$$

Solution

$$Sn{ Cl }_{ 3 }\longrightarrow { Sc }^{ 3+ }+3{ Cl }^{ - }\quad $$
No unpaired electron so, will show diamagnetic character so will weights less when, weighted in magnetic field.
Question 3
1 / -0

What is the atomic number of the element with $$M^{2+}$$ ion having electronic configuration $$[Ar]3d^{8}$$?

A
$$25$$

B
$$28$$

C
$$27$$

D
$$26$$

Solution

$$E.C$$ of $$M : [Ar]4s^{2}3d^{8}$$

$$E.C$$ of $$M^{2+} : [Ar]4s^{0}3d^{8}$$

Total electrons $$= 28 =$$ atomic number.
Question 4
1 / -0

The magnetic nature of elements depends on the presence of unpaired electrons. Identify the configuration of transition elements which shows highest magnetic moment?

A
$$3d^2$$

B
$$3d^8$$

C
$$3d^7$$

D
$$3d^5$$

Solution

The magnetic nature of elements depends on the presence of unpaired electrons. $$\displaystyle 3d^5$$ configuration of transition elements which shows highest magnetic moment as it has maximum number of unpaired electrons (5 unpaired electrons).
Question 5
1 / -0

Experimental value of magnetic momentum of $${ Mn }^{ 2+ }$$ complex is $$5.96$$ B.M. This indicates:

A
Axial and orbital motion of electron in same direction

B
Axial and orbital motion of electron in opposite direction

C
Electron does not exhibit orbital motion, it only exhibits axial motion

D
Electron does not exhibit axial motion, it only exhibits orbital motion

Solution

$$\sqrt {n(n+2)}= 5.96$$

$$n=5$$

The axial motion of electron is clockwise because $$S=+1/2$$ and the orbital motion will also be in clockwise direction.
Question 6
1 / -0

Metals are usually used as catalysts belong to:

A
s-block

B
p-block

C
d-block

D
f-block

Solution

d-block metals, e.g. Ni, Pt, Fe, etc, are used as catalysts.
Question 7
1 / -0

The highest magnetic moment is shown by the transition metal ion with outer electronic configuration:

A
$${ d }^{ 9 }$$

B
$${ d }^{ 7 }$$

C
$${ d }^{ 5 }$$

D
$${ d }^{ 3 }$$

Solution

The highest magnetic moment is shown by the transition metal ion with outer electronic configuration $${ d }^{ 5 }$$ as it has maximum (five) number of unpaired electrons. Higher is the number of unpaired electrons, higher is the magnetic moment.
$$ \displaystyle \mu_{eff}=\sqrt {n(n+2)}$$ B.M.
$${ d }^{ 3 }$$, $${ d }^{ 7 }$$ and $${ d }^{ 9 }$$ have 3, 3 and 1 unpaired electrons respectively.
Question 8
1 / -0

Which of following ion has the maximum theoretical magnetic moment?

A
$$Cr^{3+}$$

B
$$Fe^{3+}$$

C
$$Ti^{3+}$$

D
$$Co^{3+}$$

Solution

$$Fe^{3+}$$
n=5 (unparied electrons)
$$\therefore \mu =\sqrt{n(n+2)}BM$$
$$=\sqrt {5(5+2)}$$
$$=\sqrt{35}= 5.91 \, BM$$
Question 9
1 / -0

Identify a 'Chemical twin' among the followings.

A
$$Zr-Ta$$

B
$$Nb-Tc$$

C
$$Hf-Re$$

D
$$Nb-Ta$$

Solution

Chemical twins are those in which the properties of some elements are same. Atomic size of Zr and Hf , Nb and Ta are similar. This is due to lanthanide contraction.
Question 10
1 / -0

Which lanthanide compound is used as a pigment?

A
$$CeO_{2}$$

B
$$Ce(OH)_{3}$$

C
$$Lu(OH)_{3}$$$

D
$$Tb(OH)_{3}$$

Solution

Ceria or cerium oxide, $$CeO_{2}$$, a lanthanide compound is used as a pigment and as a polishing agent for glass.

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Re-Attempt Weekly Quiz Competition

The d- and f- Block Elements Test - 33

Result

The d- and f- Block Elements Test - 33

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SHARING IS CARING

Question 1

gadolinium

holmium

promethium

neodynium

Solution

Question 2

$$Sr{ Cl }_{ 3 }$$

$$Fe{ Cl }_{ 3 }$$

$$Ti{ Cl }_{ 3 }$$

$$V{ Cl }_{ 3 }$$

Solution

Question 3

$$25$$

$$28$$

$$27$$

$$26$$

Solution

Question 4

$$3d^2$$

$$3d^8$$

$$3d^7$$

$$3d^5$$

Solution

Question 5

Axial and orbital motion of electron in same direction

Axial and orbital motion of electron in opposite direction

Electron does not exhibit orbital motion, it only exhibits axial motion

Electron does not exhibit axial motion, it only exhibits orbital motion

Solution

Question 6

s-block

p-block

d-block

f-block

Solution

Question 7

$${ d }^{ 9 }$$

$${ d }^{ 7 }$$

$${ d }^{ 5 }$$

$${ d }^{ 3 }$$

Solution

Question 8

$$Cr^{3+}$$

$$Fe^{3+}$$

$$Ti^{3+}$$

$$Co^{3+}$$

Solution

Question 9

$$Zr-Ta$$

$$Nb-Tc$$

$$Hf-Re$$

$$Nb-Ta$$

Solution

Question 10

$$CeO_{2}$$

$$Ce(OH)_{3}$$

$$Lu(OH)_{3}$$$

$$Tb(OH)_{3}$$

Solution

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