NEET Classification of Elements and Periodicity in Properties — Set 12

Question 1

Which of the following is a transition element?

Accepted Answer

Transition elements (d-block, groups 3–12) have partially filled d-orbitals. Fe (group 8) is a transition element, while Na (s-block), Al (p-block), and Cs (s-block) are not.

Question 2

How many elements are present in the f-block of the sixth period?

Accepted Answer

The f-block in period 6 corresponds to the lanthanoids (4f), with 14 elements (Ce to Lu).

Question 3

Which oxide of a group 13 element is most resistant to hydrolysis?

Accepted Answer

$\ce{B2O3}$ (covalent, network structure) is highly resistant to hydrolysis, unlike $\ce{Al2O3}$ (amphoteric), $\ce{Ga2O3}$, or $\ce{In2O3}$, which react more readily with water or acids/bases.

NEET Chemistry: Classification of Elements and Periodicity in Properties — Practice Set 12

Q1. Which of the following is a transition element?

Q2. How many elements are present in the f-block of the sixth period?

Q3. Which oxide of a group 13 element is most resistant to hydrolysis?

Q4. Which group 13 element has the highest melting point due to its covalent network structure?

Q5. Which element has the highest second ionization enthalpy among the following?

Q6. Which group 13 element forms a trioxide with the highest acidity?

Q7. Which group 14 element forms a monoxide with the highest bond strength?

Q8. Which group 14 element forms a dioxide with the lowest solubility in water?

Q9. Which element in group 16 has the highest boiling point in its elemental form?

Q10. Which of the following has the lowest atomic radius in the second period?