The d- and f- Block Elements Test

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The d- and f- Block Elements Test - 54

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Weekly Quiz Competition

Question 1
1 / -0

Which is most reactive metal?

A
Fe

B
Pt

C
Ni

D
Co

Solution

Fe is the most reactive metal among the given metals because it easily gets oxidised in moist air.

$$ Fe \xrightarrow [H_2O.H^+ ]{ air } \underset{Rust}{Fe_2O_3 . xH_2 O} $$
Question 2
1 / -0

Which of the following metals absorbs hydrogen?

A
K

B
Al

C
Zn

D
Pd

Solution

At 350K and 1 atm pressure, 1 unit volume of Pd absorbs 900 unit volume of $$ H_2 $$ gas. This property of Pd makes it a good catalyst.
Question 3
1 / -0

All the following statements about the transitional elements are true except that

A
all of the transitional elements are predominantly metallic

B
in solution many of their simple ions are coloured

C
most of the transitional elements show pronounced catalytic activity

D
most of the transitional elements show only one valence state

Solution

Most of the transitional elements show variable oxidation states.
Hence, Option "D" is the correct answer.
Question 4
1 / -0

Least reactive metal is

A
Fe

B
Os

C
Ni

D
Pt

Solution

Least reactive metal is Pt because it is a noble metal and does not react with air, water or acid at room temperature.
Question 5
1 / -0

Out of all the known elements, the percentage of transitional elements is approximately

A
$$30\%$$

B
$$50\%$$

C
$$60\%$$

D
$$75\%$$

Solution

No. transition element = 33

Total known element = 105

Percentage of transitional elements $$ =\dfrac { \text{Transition element }}{\text{ total element} } \times 100 $$

$$= \dfrac {33 }{105} \times 100 = 31\approx 30$$%
Question 6
1 / -0

Which statement is not true ?

A
Zn is a transition metal.

B
Ag is coinese metal.

C
Density of Osmium is the greatest.

D
All of the above.

Solution

Zn is not a transition metal rather its a d-block element.
Ag, Au and Pt are called Coinese metals.
Of the all elements, Osmium has the highest density.

Hence, Option "A" is the correct answer.
Question 7
1 / -0

Atomic number of Cr and Fe are 24 and 26 respectively. Which of the following is paramagnetic with the spin of electron?

A
$$ [ Cr(NH_3)_6]^{3+} $$

B
$$ [Fe(CO)_5] $$

C
$$ [ Fe (CN)_6]^{4-} $$

D
$$ [ Cr(CO)_6 ] $$

Solution

Since, $$NH_3$$ is a weak field ligand.
Hence, it will not pair up electrons, whereas $$CO$$, $$CN^-$$ being strong field ligand will not pair up electrons.
No. of unpaired electrons in $$ [ Cr(NH_3)_6]^{3+} $$, $$ [Fe(CO)_5] $$, $$ [ Fe (CN)_6]^{4-} $$ & $$ [ Cr(CO)_6 ] $$ are 3, 0, 0 & 0 respectively.

Hence, the only paramagnetic complex among the given is $$ [ Cr(NH_3)_6]^{3+} $$.

Hence, Option "A" is the correct answer.
Question 8
1 / -0

Which of the following metals make the most efficient catalyst?

A
Transition

B
Alkali

C
Alkaline earth

D
Coloured metals

Solution

Transition metals make the most efficient catalysts.
Hence, Option "A" is the correct answer.
Question 9
1 / -0

Which of the following is the correct sequence of atomic weights of given elements?

A
$$ Fe > Co > Ni $$

B
$$ Ni > Co >Fe $$

C
$$ Co > Ni > Fe $$

D
$$ Fe > Ni > Co $$

Solution

The atomic weight of $$Co, Ni$$ and $$Fe$$ are $$58.90, 58.60, 55.85$$ respectively. Therefore, $$Co > Ni > Fe$$ is the correct sequence of atomic weight.
Question 10
1 / -0

Which belongs to the actinides series?

A
$$ Ce $$

B
$$ Cf $$

C
$$ Ca $$

D
$$ Cs $$

Solution

Ce - lanthanide
Cs - alkali metal
Cf - actinide
Ca - alkaline earth metal.

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Re-Attempt Weekly Quiz Competition

The d- and f- Block Elements Test - 54

Result

The d- and f- Block Elements Test - 54

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SHARING IS CARING

Question 1

Fe

Pt

Ni

Co

Solution

Question 2

K

Al

Zn

Pd

Solution

Question 3

all of the transitional elements are predominantly metallic

in solution many of their simple ions are coloured

most of the transitional elements show pronounced catalytic activity

most of the transitional elements show only one valence state

Solution

Question 4

Fe

Os

Ni

Pt

Solution

Question 5

$$30\%$$

$$50\%$$

$$60\%$$

$$75\%$$

Solution

Question 6

Zn is a transition metal.

Ag is coinese metal.

Density of Osmium is the greatest.

All of the above.

Solution

Question 7

$$ [ Cr(NH_3)_6]^{3+} $$

$$ [Fe(CO)_5] $$

$$ [ Fe (CN)_6]^{4-} $$

$$ [ Cr(CO)_6 ] $$

Solution

Question 8

Transition

Alkali

Alkaline earth

Coloured metals

Solution

Question 9

$$ Fe > Co > Ni $$

$$ Ni > Co >Fe $$

$$ Co > Ni > Fe $$

$$ Fe > Ni > Co $$

Solution

Question 10

$$ Ce $$

$$ Cf $$

$$ Ca $$

$$ Cs $$

Solution

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