NEET Classification of Elements and Periodicity in Properties — Set 2

Question 1

Which element in group 17 shows an anomaly in electron gain enthalpy compared to its neighbors?

Accepted Answer

F has less negative electron gain enthalpy than Cl due to electron repulsion in its compact 2p orbitals, an anomaly in group 17 trends where Cl > Br > I.

Question 2

Which of the following has the largest ionic radius among group 17 anions?

Accepted Answer

Ionic radius increases down group 17. Among $\ce{F^-}$, $\ce{Cl^-}$, $\ce{Br^-}$, and $\ce{I^-}$, $\ce{I^-}$ (from I, period 5) has the largest radius.

Question 3

Which element in group 14 has the lowest melting point?

Accepted Answer

Melting point in group 14 decreases from C (covalent network) to Sn and Pb (metallic), with Sn having the lowest among C, Si, Ge, and Sn due to weaker metallic bonding.

NEET Chemistry: Classification of Elements and Periodicity in Properties — Practice Set 2

Q1. Which element in group 17 shows an anomaly in electron gain enthalpy compared to its neighbors?

Q2. Which of the following has the largest ionic radius among group 17 anions?

Q3. Which element in group 14 has the lowest melting point?

Q4. What is the systematic element name for the element with atomic number 117 before its official naming?

Q5. Which element has the highest melting point among the alkali metals?

Q6. Which element in group 2 has the highest hydration energy in its ionic form?

Q7. Which d-block element in the fourth period has the highest first ionization enthalpy?

Q8. Which element in group 1 has the lowest second ionization enthalpy?

Q9. Which pair of elements from different periods shows the greatest similarity in oxide acidity?

Q10. Which element in group 17 has the highest tendency to form ionic compounds with group 1 elements?