NEET Classification of Elements and Periodicity in Properties — Set 17

Question 1

Which of the following is a d-block element?

Accepted Answer

d-block elements (groups 3–12) have electrons filling d-orbitals. Mn (group 7) is a d-block element, while Ga (p-block), Rb (s-block), and Kr (p-block) are not.

Question 2

Which element in the fourth period has the highest fourth ionization enthalpy?

Accepted Answer

Fourth ionization enthalpy peaks when removing an electron from a stable $\ce{X^3+}$ ion. Si (after losing three electrons, becomes $\ce{Si^3+}$ with $1s^2 2s^2 2p^6$) has the highest value.

Question 3

Which element in the fifth period has the highest third ionization enthalpy?

Accepted Answer

Third ionization enthalpy peaks when removing an electron from a noble gas-like $\ce{X^2+}$ ion. Sr (after losing two electrons, becomes $\ce{Sr^2+}$ with $1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4p^6$) has the highest value in period 5.

NEET Chemistry: Classification of Elements and Periodicity in Properties — Practice Set 17

Q1. Which of the following is a d-block element?

Q2. Which element in the fourth period has the highest fourth ionization enthalpy?

Q3. Which element in the fifth period has the highest third ionization enthalpy?

Q4. Which d-block element in period 5 exhibits the highest oxidation state of +7?

Q5. Which of the following d-block elements in period 4 has an exceptional electronic configuration?

Q6. Which element in group 15 has the lowest electronegativity?

Q7. What is the maximum number of electrons that can be accommodated in the subshells filled in the fifth period?

Q8. Which group 16 element forms a trioxide with the highest oxidation state?

Q9. Which group 14 element forms a dioxide with the highest bond energy?

Q10. Which oxide of a group 15 element is the most acidic?