NEET Classification of Elements and Periodicity in Properties — Set 16

Question 1

Which d-block element in period 5 has the highest melting point?

Accepted Answer

In period 5 d-block (Y to Cd), melting point peaks with strong metallic bonding. Mo (group 6, $4d^5 5s^1$) has the highest melting point due to maximum unpaired electrons.

Question 2

Which of the following has the highest first ionization enthalpy among the third period elements?

Accepted Answer

First ionization enthalpy increases across a period. Among Na, Mg, Si, and Ar, Ar (group 18, period 3) has the highest value due to its stable noble gas configuration.

Question 3

What is the temporary systematic IUPAC name for the element with atomic number 115?

Accepted Answer

For $Z = 115$: 1 (un), 1 (un), 5 (pent) → ununpentium (before its official name, Moscovium).

NEET Chemistry: Classification of Elements and Periodicity in Properties — Practice Set 16

Q1. Which d-block element in period 5 has the highest melting point?

Q2. Which of the following has the highest first ionization enthalpy among the third period elements?

Q3. What is the temporary systematic IUPAC name for the element with atomic number 115?

Q4. Which pair of elements from the same period shows the greatest difference in electronegativity?

Q5. What is the temporary systematic name of the element with atomic number 115?

Q6. Which element in group 17 has the highest boiling point?

Q7. What is the formula of the compound formed by aluminium and oxygen?

Q8. Which oxide is amphoteric in nature?

Q9. Which group 15 element forms a hydride with the lowest thermal stability?

Q10. Which element in group 14 has the highest ionization enthalpy after losing three electrons?