The d- and f- Block Elements Test

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The d- and f- Block Elements Test - 52

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Weekly Quiz Competition

Question 1
1 / -0

Which forms coloured salts?

A
Metals

B
Non-metals

C
p-block elements

D
Transitional elements

Solution

Transitional elements form coloured salts due to the presence of unpaired electrons of d-orbital.
Question 2
1 / -0

Which of the following statements is not true in regard to transition elements?

A
They readily form complex compounds

B
They show variable valency

C
All their ions are colourless

D
Their ions contain partially filled d -electron levels

Solution

"All their ions are colourless" this sentence is false because they are $$90\%$$ coloured and only few are colourless.
Question 3
1 / -0

Transitional elements are named transition elements because their characters are

A
in between s and p - block elements

B
like that of p and d - block elements

C
they are members of I – A group

D
they are like inactive elements

Solution

Transitional elements are named transition elements because their characters are in between s and p-block elements.
Question 4
1 / -0

Which ion is not coloured?

A
$$ Cr^{3+} $$

B
$$ Co^{2+} $$

C
$$ Cr^{2+} $$

D
$$ Cu^{+} $$

Solution

$$ Cu^+ $$ do not have any unpaired electron so ion is not coloured.
Question 5
1 / -0

If the colours of salts of transition elements are due to the presence of unpaired electrons in the transition metal ions, which of the following ions will be colourless in aqueous solution.

A
$$ Ti^{3+} $$

B
$$ Ti^{4+} $$

C
$$ Fe^{2+} $$

D
$$ Fe^{3+} $$

Solution

$$ Ti^{4+} \rightarrow 3d^0 4s^0$$ ions will be colourless in aqueous solution as it has no unpaired electrons.
Question 6
1 / -0

Which of the following ions has the least magnetic moment?

A
$$ Cu^{2+} $$

B
$$ Ni^{2+} $$

C
$$ Co^{3+} $$

D
$$ Fe^{2+} $$

Solution

Since $$Cu^{2+}$$ ions has only one unpaired electron so it has the least magnetic moment.
Question 7
1 / -0

Which of the following is diamagnetic transitional metal ion?

A
$$Ni^{2+} $$

B
$$ Zn^{2+} $$

C
$$ Co^{2+} $$

D
$$ Cu^{2+} $$

Solution

$$ Zn^{2+} - [Ar]3d^{10} $$ has no unpaired electrons hence, diamagnetic in nature.
Question 8
1 / -0

Of the ions $$ Zn^{2+} , Ni^{2+}$$ and $$ Cr^{3+} $$ [ atomic number of Zn = 30 , Ni = 28, Cr = 24 ]

A
Only $$ Zn^{2+} $$ is colourless and $$ Ni^{2+} $$ and $$ Cr^{3+} $$ are coloured

B
All three are colourless

C
All three are coloured

D
Only $$ Ni^{2+} $$ is coloured and $$ Zn^{2+} $$ and $$ Cr^{3+} $$ are colourless

Solution

$$ Ni^{2+} $$ and $$ Cr^{2+} $$ are coloured due to presence of unpaired d-orbitals electrons. But $$ Zn^{2+} $$ is colourless because of absence of unpaired electrons.
Question 9
1 / -0

The elements belonging to the first transition series have an atomic number from

A
19 to 37

B
22 to 32

C
24 to 30

D
21 to 30

Solution

The elements belonging to the first transition series have atomic number from 21 to 30.
Hence, Option "D" is the correct answer.
Question 10
1 / -0

Which of the following is not correct about transition metals?

A
Their melting and boiling points are high

B
Their compounds are generally coloured

C
They can form ionic or covalent compounds

D
They do not exhibit variable valency

Solution

They show variable valency due to presence of vacant d orbitals

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Re-Attempt Weekly Quiz Competition

The d- and f- Block Elements Test - 52

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The d- and f- Block Elements Test - 52

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Question 1

Metals

Non-metals

p-block elements

Transitional elements

Solution

Question 2

They readily form complex compounds

They show variable valency

All their ions are colourless

Their ions contain partially filled d -electron levels

Solution

Question 3

in between s and p - block elements

like that of p and d - block elements

they are members of I – A group

they are like inactive elements

Solution

Question 4

$$ Cr^{3+} $$

$$ Co^{2+} $$

$$ Cr^{2+} $$

$$ Cu^{+} $$

Solution

Question 5

$$ Ti^{3+} $$

$$ Ti^{4+} $$

$$ Fe^{2+} $$

$$ Fe^{3+} $$

Solution

Question 6

$$ Cu^{2+} $$

$$ Ni^{2+} $$

$$ Co^{3+} $$

$$ Fe^{2+} $$

Solution

Question 7

$$Ni^{2+} $$

$$ Zn^{2+} $$

$$ Co^{2+} $$

$$ Cu^{2+} $$

Solution

Question 8

Only $$ Zn^{2+} $$ is colourless and $$ Ni^{2+} $$ and $$ Cr^{3+} $$ are coloured

All three are colourless

All three are coloured

Only $$ Ni^{2+} $$ is coloured and $$ Zn^{2+} $$ and $$ Cr^{3+} $$ are colourless

Solution

Question 9

19 to 37

22 to 32

24 to 30

21 to 30

Solution

Question 10

Their melting and boiling points are high

Their compounds are generally coloured

They can form ionic or covalent compounds

They do not exhibit variable valency

Solution

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