d & f-block Elements

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Q1. What is the primary reason for the variable oxidation states of transition metals?

Solution:

The presence of d-electrons allows transition metals to exhibit variable oxidation states.

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Q2. Which transition metal has the highest melting point?

Solution:

Tungsten (W) has the highest melting point among transition metals.

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Q3. Which of the following is a lanthanide series element?

Solution:

Neodymium (Nd) is a member of the lanthanide series.

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Q4. Which of the following elements is known for forming complex ions?

Solution:

Copper (Cu) is known for forming complex ions due to its ability to coordinate with ligands.

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Q5. Which of the following elements is a f-block element?

Solution:

Uranium is an f-block element as it is part of the actinides series.

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Q6. Which of the following pairs are f-block elements? (2023)

Solution:

Lanthanum (La) and Cerium (Ce) are both f-block elements, belonging to the lanthanide series.

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Q7. Which transition metal has the electron configuration [Ar] 3d6 4s2?

Solution:

Iron (Fe) has the electron configuration [Ar] 3d6 4s2.

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Q8. Which of the following ions has a d5 configuration?

Solution:

Mn2+ has a d5 configuration as it loses two electrons from its 4s and 3d orbitals.

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Q9. Which transition metal is known for forming complex ions with a coordination number of 6?

Solution:

Cobalt commonly forms complex ions with a coordination number of 6, such as in [Co(NH3)6]3+.

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Q10. Which transition metal is known for its catalytic properties in the Haber process?

Solution:

Iron is used as a catalyst in the Haber process for ammonia synthesis.