Classification Of Elements And Periodicity Of Properties Multiple Choice Questions

Classification Of Elements And Periodicity Of Properties Multiple Choice Questions

Question 1. All the elements in a group in the periodic table have the same

1. Number of electrons
2. Number of valence electrons
3. Atomic weight
4. Atomic number

Answer: 2. Number of valence electrons

Question 2. On moving down a group, the electropositive character of elements

1. Increases
2. Decreases
3. Remains the same
4. None of the above

Answer: 1. Increases

Question 3. The 3d transition series contains elements with atomic numbers from

1. 22 to 30
2. 21 to 30
3. 21 to 31
4. 21 to 29

Answer: 2. 21 to 30

Question 4. The electronegativity of the following elements increases in the order

1. C, N, Si, P
2. N, Si, C, P
3. Si, P, C, N
4. P, Si, N, C

Answer: 3. Si, P, C, N

Question 5. A sudden jump in the difference between the second and third ionisation enthalpies is associated with the electronic configuration

1. \(1 s^2 2 s^2 2 p^6 3 s^1\)
2. \(1 s^2 2 s^2 2 p^6 3 s^2 3 p^1\)
3. \(1 s^2 2 s^2 2 p^6 3 s^2 3 p^6\)
4. \(1 s^2 2 s^2 2 p^6 3 s^2\)

Answer: 4. \(1 s^2 2 s^2 2 p^6 3 s^2\)

Question 6. Which of the following pairs belongs to the same group?

1. Ba, Ca
2. Mg, Na
3. Na, Cl
4. Mg, Cu

Answer: 1. Ba, Ca

Question 7. Choose the correct order of ionic radii from the following.

1. \(\mathrm{Ca}^{2+}>\mathrm{Na}^{+}>\mathrm{Mg}^{2+}>\mathrm{O}^{2-}\)
2. \(\mathrm{Ca}^{2+}>\mathrm{O}^{2-}>\mathrm{Na}^{+}>\mathrm{Mg}^{2+}\)
3. \(\mathrm{Na}^{+}>\mathrm{Ca}^{2+}>\mathrm{Mg}^{2+}>\mathrm{O}^{2-}\)
4. \(\mathrm{O}^{2-}>\mathrm{Ca}^{2+}>\mathrm{Mg}^{2+}>\mathrm{Na}^{+}\)

Answer: 2.\(\mathrm{Ca}^{2+}>\mathrm{O}^{2-}>\mathrm{Na}^{+}>\mathrm{Mg}^{2+}\)

Question 8. The valence shell electronic configuration of the most electronegative element is

1. ns²np¹
2. ns²np⁵
3. ns²np⁴
4. ns²np³

Answer: 2. ns²np⁵

Question 9. Which of the following represents the electronic configuration of d-block elements?

1. \((n-1) \mathrm{d}^{1-10} n \mathrm{~s}^{1-2}\)
2. \((n-1) \mathrm{s}^{1-2} n \mathrm{~d}^{1-10}\)
3. \((n-1) \mathrm{d}^{1-10} n \mathrm{~s}^2 n \mathrm{p}^4\)
4. \((n-1) \mathrm{p}^4 n \mathrm{~s}^2\)

Answer: 1. \((n-1) \mathrm{d}^{1-10} n \mathrm{~s}^{1-2}\)

Question 10. An element with the atomic number 24 belongs to the

1. s block
2. p block
3. d block
4. f block

Answer: 3. d block

Question 11. Which of the following transitions involves the maximum amount of energy?

1. \(\mathrm{M}^{-}(\mathrm{g}) \rightarrow \mathrm{M}(\mathrm{g})\)
2. \(\mathrm{M}(\mathrm{g}) \rightarrow \mathrm{M}^{+}(g)\)
3. \(\mathrm{M}^{2+}(\mathrm{g}) \rightarrow \mathrm{M}^{3+}(\mathrm{g})\)
4. \(\mathrm{M}^{+}(\mathrm{g}) \rightarrow \mathrm{M}^{2+}(\mathrm{g})\)

Answer: 3. \(\mathrm{M}^{2+}(\mathrm{g}) \rightarrow \mathrm{M}^{3+}(\mathrm{g})\)

Question 12. Which of the following species has the highest electron affinity?

1. F^–
2. O
3. O^–
4. Na⁺

Answer: 2. O

Question 13. Which of the following increases from iodine to fluorine?

1. Bond length
2. Electronegativity
3. The first ionisation enthalpy
4. Oxidising power

Answer:

2. Electronegativity

3. The first ionisation enthalpy

4. Oxidising power

Question 14. Elements of the same group are characterised by the same

1. Ionisation enthalpy
2. Electronegativity
3. Electron gain enthalpy
4. Number of valence electrons

Answer: 4. Number of valence electrons

Question 15. Which of the following have the highest ionisation enthalpies?

1. Halogens
2. Noble gases
3. Alkali metals
4. Alkaline Earth metals

Answer: 2. Noble gases

Question 16. The elements in which 4f orbitals are progressively filled in are called

1. Transition elements
2. Actinides
3. Lanthanides
4. Coinage metals

Answer: 3. Lanthanides

Question 17. The correct order of the first ionisation enthalpies among the elements Be, B, C, N and O is

1. Be < B< O < C < N
2. B < Be < C < O < N
3. N < C < O < B < Be
4. N < O < C < Be < B

Answer: 2. B < Be < C < O < N