The d- and f- Block Elements Test

Result

The d- and f- Block Elements Test - 64

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following ion has magnetic moment 3.87 BM?

A
$$Co^{2+}$$

B
$$Mn^{3+}$$

C
$$Cu^{+}$$

D
$$Ni^{2+}$$
Question 2
1 / -0

The correct order of spin -only magnetic moments among the following is :
(Atomic number : $$ Mn =25, Co + 27 , Ni = 28, Zn = 30) $$

A
$$ [ZnCl_4]^{2-} > [NiCl_4]^{2-} > [CoCl_4]^{2-} > [MnCl_4]^{2-} $$

B
$$ [CoCl_4]^{2-} > [MnCl_4]^{2- } > [NiCl_4]^{2-} > [ZnCl_4]^{2-} $$

C
$$ [MnCl_{ 4 }]^{ 2- }>[CoCl_{ 4 }]^{ 2- }>[NiCl_{ 4 }]^{ 2- }>[ZnCl_{ 4 }]^{ 2- } $$

D
$$ [NiCl_{ 4 }]^{ 2- }>[CoCl_{ 4 }]^{ 2- }>[MnCl_{ 4 }]^{ 2- }>[ZnCl_{ 4 }]^{ 2- } $$

Solution
Question 3
1 / -0

The effect of lanthanoid contration in the lanthanid series of elements by and large means:

A
decrease in atomic radii and increases in ionic radii

B
decrease in both atomic and ionic radii

C
increase in both atomic and ionic radii

D
increases in atomic radii and decrease in ionic radii
Question 4
1 / -0

A transition metal cation M$$^{2+}$$ has a magnetic moment $$\sqrt35$$. what is the atomic number of the metal?

A
$$24$$

B
$$25$$

C
$$26$$

D
$$27$$

Solution
Question 5
1 / -0

Orbital angular momentum of $$ e^- $$ (last filled ) in Cr is

A
Zero

B
$$ \sqrt { 2 } \frac { h }{ 2\pi } $$

C
$$ \sqrt { 6 } \frac { h }{ 2\pi } $$

D
$$ \sqrt { 12 } \frac { h }{ 2\pi } $$
Question 6
1 / -0

An iron $$ _{25}Mn^{x+} $$ has the magnetic moment of 4.9 BM. What is the value of x ?

A
3

B
4

C
2

D
5

Solution
Question 7
1 / -0

An orange solid (A) on heating gave a green residue (B), a colourless gas (C) and water vapour. The gas (C) on passing over heated Mg gave white solid (D) which on reaction with water gave a gas (E). The gas (E) forms white fumes with HCl.
An orange solid A is

A
Sodium dichromate

B
Potassium dichromate

C
Potassium chromate

D
Ammonium dichromate
Question 8
1 / -0

The metal ion which is not colored is:

A
$${ Fe }^{ 3+ }$$

B
$${ V }^{ 2+ }$$

C
$${ Zn }^{ 2+ }$$

D
$${ Ti }^{ 3+ }$$

Solution
Question 9
1 / -0

The d-electronic configuration of $${ Cr }^{ 2+ },{ Mn }^{ 2+ },{ Fe }^{ 2+ }$$ and $${ Ni }^{ 2+ }$$ are $${ 3d }^{ 4 },{ 3d }^{ 5 },{ 3d }^{ 6 }$$ and $${ 3d }^{ 8 }$$ respectively. Which one of the following aqua complexes will exhibit the maximum paramagnetic character?

A
$$\left[ \left( Fe\left( { H }_{ 2 }O \right) \right) _{ 6 } \right] ^{ 2+ }$$

B
$$\left[ \left( Ni\left( { H }_{ 2 }O \right) \right) _{ 6 } \right] ^{ 2+ }$$

C
$$\left[ \left( { C }{ r }\left( { H }_{ 2 }O \right) \right) _{ 6 } \right] ^{ 2+ }$$

D
$$\left[ \left( { Mn }\left( { H }_{ 2 }O \right) \right) _{ 6 } \right] ^{ 2+ }$$
Question 10
1 / -0

Which of the following lanthanum ions is diamagnetic?

A
$${ Ce }^{ 4+ }$$

B
$${ Sm }^{ 2+ }$$

C
$$Eu^{ 2+ }$$

D
$$Yb^{ 2+ }$$