The d- and f- Block Elements Test

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The d- and f- Block Elements Test - 12

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Weekly Quiz Competition

Question 1
1 / -0

Elements which generally exhibit variable oxidation states and form colored ions are ___________.

A
metalloids

B
transition elements

C
non-metals

D
gases

Solution

Transition elements have vacant d orbitals and the energy gap between d orbitals is very less. So transition elements exhibit variable oxidation state and form coloured ions as these elements emit radiations due to excitation of d electrons.
Question 2
1 / -0

Which sub shell is filled up progressively in actinoids?

A
4f

B
5f

C
6d

D
7s

Solution

5f sub shell is filled up progressively in actinoids.
Question 3
1 / -0

Which compound is volatile on heating?

A
$$MgCl_{2}$$

B
$$HgCl_{2}$$

C
$$ZnCl_{2}$$

D
none of these

Solution

$$Hg$$ metal is present in liquid state, hence $$HgCl_{2}$$ is volatile in nature.
Question 4
1 / -0

The following is not a noble metal

A
Au

B
Cu

C
Ag

D
Pt

Solution

The noble metals are those metals that are resistant to corrosion and oxidation in moist air, unlike most base metals. The noble metals are most commonly considered to be ruthenium, rhodium, palladium, silver, platinum and gold. Copper is not considered to be a noble metal.
Question 5
1 / -0

Magnetic moment of diamagnetic substance in Bohr Magnetons is:

A
1.73

B
2.83

C
50

D
0

Solution

Magnetic moment of diamagnetic substance is zero.
Question 6
1 / -0

Which of the following has smallest ionic radius ?

A
Nd$$^{3+}$$

B
Dy$$^{3+}$$

C
Lu$$^{3+}$$

D
Pm$$^{3+}$$

Solution

As we move from left to right in a raw, radii decreases.
So radii of $$Lu^{+3}$$ is smallest among all.
Question 7
1 / -0

Transition metals are often para magnetic owing to ____________.

A
high melting point and boiling point

B
the presence of vacant orbitals

C
the presence of unpaired electrons

D
malleability and ductility

Solution

Any metal or ion having unpaired electron will show paramagnetism.
Question 8
1 / -0

The highest magnetic moment is shown by the transition metal ion with which of the following outermost electronic configuration?

A
$$3d^{2}$$

B
$$3d^{5}$$

C
$$3d^{7}$$

D
$$3d^{9}$$

Solution

As magnetic moment is $$\sqrt{n(n+2)}$$ where n is no. of unpair electron, so greater the no. of unpair electron and greater will be the magnetic moment of a ion. $$3d^2$$ has 2 unpair electron, $$3d^5$$ has 5 unpair electron, $$3d^7$$ has 3 unpair electron and $$3d^9$$ has 1 unpair electron. So, $$3d^5$$ has highest magnetic moment.
Question 9
1 / -0

The property seen in f-block elements is :

A
Lanthanoid contraction

B
Actinide contraction

C
both (A) and (B)

D
Lanthanoid expansion

Solution

The property seen in f-block elements are Lanthanoid contraction and Actinide contraction.

Lanthanide contraction is a term used in chemistry to describe the greater than expected decrease in ionic radii of the elements in the lanthanide series.

Option C is correct.
Question 10
1 / -0

Which one of the following ionic species will impart colour to an aqueous solution?

A
Sc$$^{+3}$$

B
Cd$$^{+2}$$

C
Zn$$^{+2}$$

D
Cr$$^{+3}$$

Solution

Among given ions only Cr$$^{+3}$$ ($$d^3$$ configuration of Cr) has unpair electron so it will show colour. Cd$$^{+2}$$, Zn$$^{+2}$$ and Sc$$^{+3}$$ have no valence free electron so they are colourless.

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Re-Attempt Weekly Quiz Competition

The d- and f- Block Elements Test - 12

Result

The d- and f- Block Elements Test - 12

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SHARING IS CARING

Question 1

metalloids

transition elements

non-metals

gases

Solution

Question 2

4f

5f

6d

7s

Solution

Question 3

$$MgCl_{2}$$

$$HgCl_{2}$$

$$ZnCl_{2}$$

none of these

Solution

Question 4

Au

Cu

Ag

Pt

Solution

Question 5

1.73

2.83

50

0

Solution

Question 6

Nd$$^{3+}$$

Dy$$^{3+}$$

Lu$$^{3+}$$

Pm$$^{3+}$$

Solution

Question 7

high melting point and boiling point

the presence of vacant orbitals

the presence of unpaired electrons

malleability and ductility

Solution

Question 8

$$3d^{2}$$

$$3d^{5}$$

$$3d^{7}$$

$$3d^{9}$$

Solution

Question 9

Lanthanoid contraction

Actinide contraction

both (A) and (B)

Lanthanoid expansion

Solution

Question 10

Sc$$^{+3}$$

Cd$$^{+2}$$

Zn$$^{+2}$$

Cr$$^{+3}$$

Solution

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