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CBSE Class-12 Chemistry Chapter-08 Quiz: The D and F-Block Elements

12 Questions

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CBSE Class-12 Chemistry Chapter-08 Quiz: The D and F-Block Elements

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Questions and Answers

What is the general electronic configuration for d-block elements?

(n-1)p1-6 ns1-2

(n-1)d1-10 ns1-2 (correct)

(n-1)d1-10 np1-2

(n-1)s1-10 nd1-2

Which elements are known as lanthanoids?

Titanium (22) to Copper (29)

Selenium (34) to Krypton (36)

Scandium (21) to Zinc (30)

Cerium (58) to Lutetium (71) (correct)

What is defined as a transition element?

An element with incompletely filled d-orbitals (correct)

An element with completely filled f-orbitals

An element with incompletely filled p-orbitals

An element with completely filled s-orbitals

Why are zinc, cadmium, and mercury not regarded as transition metals?

Due to completely filled d-orbitals Signup and view all the answers

Which elements are known as actinoids?

Thorium (90) to Lawrencium (103) Signup and view all the answers

Which series of transition elements consists of the atomic numbers 21 to 30?

3d-transition series Signup and view all the answers

Why do transition elements have strong metallic bonds?

Thanks to the presence of unpaired electrons Signup and view all the answers

What causes the atomic radii of Cu and Zn to be bigger compared to Fe, Co, and Ni?

Increase in shielding effect and electron-electron repulsion Signup and view all the answers

What leads to the irregular variation in ionization energies of transition metals?

Lanthanoid Contraction effect Signup and view all the answers

Why does the ionization energy of the 5d transition series differ from the 3d and 4d transition series?

Because of the Lanthanoid Contraction Signup and view all the answers

What property makes transition metals suitable for use as catalysts?

(n-1)d as well as ns electrons taking part in bond formation Signup and view all the answers

Why are most transition metals paramagnetic in nature?

Increase in the number of unpaired electrons Signup and view all the answers