Periodic Classification of Elements 1000+ MCQ with answer for NDA

1. Which of the following has minimum ionisation energy?
A. F
B. Cl
C. Br
D. I
Answer : D

2. An element has atomic number 2. It belongs to
A. O group
B. III A group
C. VI group
D. II B group
Answer : A

3. Which of the following has maximum electron affinity ?
A. Cl
B. Br
C. I
D. F
Answer : A

4. The first atom with maximum number of d-electrons is with atomic number
A. 27
B. 46
C. 36
D. 29
Answer : D

5. 3.Atomic number of an element X is 34, it belongs to
A. IV period, VIA group
B. IV period, IIA group
C. V period, III B group
D. IV period, VII A group
Answer : A

6. Law of octaves was given by
A. Meyer
B. Mendeleev
C. Moseley
D. Newland
Answer : D

7. A metal may have atomic number
A. 85
B. 32
C. 38
D. 2
Answer : C

8. In the periodic table on moving from left to right across a period, the metallic character of elements
A. increases
B. decreases
C. increases and decreases
D. remains the same
Answer : B

9. Elements whose atoms have incompletely filled penultimate energy levels are known as
A. s-block elements
B. p-block elements
C. d-block elements
D. inert gases
Answer : C

10. In a Lother Meyer curve sodium occurs at
A. bottom
B. peak
C. some point on the curve
D. middle of the curve
Answer : B

11. IV Period has.........elements.
A. 18
B. 36
C. 8
D. 9
Answer : A

12. Which of the following elements is not liquid at room temperature, i.e., 25°C?
A. Hg
B. Br
C. Cl
D. Cs
Answer : D

13. Which of the following have maximum size?
A. $Cl$
B. $N_2$
C. $F$
D. $Ne$
Answer : D

14. The smallest ion amongst the following
A. $S{i}^{+++1}$
B. $K^{+}$
C. $A{t}^{1+1}$
D. $M{g}^{+1}$
Answer : A

15. $O^{2-}$, $F^{F-}$, $N{a}^{+}$ and $M{g}^{2+}$ are isoelectronic, the order of increasing size is
A. $F^{-}<N{a}^{+}{g}^{++}<O^{2-}$
B. $F^{-}<O^{2-}<N{a}^{+}<M{g}^{++}$
C. $M{g}^{++}<F^{-}<N{a}^{+}<O^{2-}$
D. $M{g}^{++}<N{a}^{+}<F^{-}<O^{2-}$
Answer : D

16. Elements belonging to the same period are
A. Si, N, O
B. Li, Be, Mg
C. Sc. Ti. V
D. Cu, Zn, Cd
Answer : C

17. In the Mendeleef's periodic table properties of the elements are the periodic function of their
A. atomic weight
B. atomic number
C. atomic volume
D. none of these
Answer : A

18. Which of the following atoms is paramagnetic?
A. Zn
B. N
C. Ca
D. Sr
Answer : B

19. The differentiating electron enters in the penultimate energy level in the case of
A. s block ele.
B. p block ele.
C. d block ele.
D. f block ele.
Answer : A

20. Second electron affinity of the elements is always
A. positive
B. negative
C. zero
D. more than first E.A.
Answer : B

21. Which of the following conform both cation and anion?
A. I
B. Cl
C. K
D. F
Answer : A

22. Which of the following has maximum ionisation energy ?
A. Li
B. Be
C. C
D. B
Answer : B

23. Which of the following has the maximum size?
A. $A{l}^{-}$
B. $Ne$
C. $N{a}^{+}$
D. $F^{-}$
Answer : B

24. Which of the following elements have maximum electronegativity?
A. Cl
B. Br
C. F
D. C
Answer : C

25. On moving across a period from left to right the ionisation energy increases because
A. value of principal quantum number increases
B. effective nuclear charge increases
C. atomic size increases
D. nuclear charge increases
Answer : A

26. Which of the following has minimum ionisation energy
A. Ca
B. In
C. Te
D. Rb
Answer : D

27. Which of the following did not find a place in Mendeleef's periodic table?
A. Fr
B. Na
C. Ce
D. CI
Answer : A

28. The general electronic configuration of s-block elements is
A. $n{s}^{1-2}$
B. $n{s}^2{p}^6$
C. $n{s}^1$
D. $n{s}^{0 to2}$
Answer : A

29. With the increase in atomic number in a period of the periodic table
A. electron affinity decreases
B. metallic character decreases
C. ionisation energy decreases
D. atomic mass decreases
Answer : B

30. An element A has atomic number 7. It will have properties similar to the element with atomic number
A. 85
B. 57
C. 26
D. 51
Answer : D

31. The element with no definite place in the periodic table is
A. At
B. H
C. N
D. Pt
Answer : B

32. The pair of elements that exhibit diagonal relationship is
A. Li-Mg
B. Al-Na
C. Ne-Ar
D. Si-P
Answer : A

33. Which of the following is an inert gas?
A. Oxygen
B. Nitrogen
C. Argon
D. Hydrogen
Answer : C

34. In C, N, O and F the electronegativity
A. decreases from C to F
B. decreases from C to O and then increases to F
C. increases from O to C and then decreases to F
D. increases from C to F
Answer : D

35. Which of the following have negative electron affinity?
A. Kr
B. U
C. Y
D. Pb
Answer : A

36. Which of the following is not an s-block element?
A. Ru
B. Be
C. Fr
D. Rb
Answer : A

37. Ionisation energy is the amount of energy required to remove
A. the most loosely bound electron from an isolated gaseous atom
B. an electron from an atom of an element
C. an electron from an isolated gaseous atom
D. an electron from covalently bonded atom in a molecule
Answer : A

38. The heaviest element is
A. Cs
B. Na
C. Hg
D. U
Answer : D

39. Which of the following has maximum ionisation energy?
A. Li
B. Ba
C. Cl
D. Be
Answer : D

40. Lother Meyer plotted a graph of
A. Atomic volume versus atomic number
B. Atomic radii versus atomic weight
C. Atomic weight versus mass number
D. Atomic volume versus atomic weight
Answer : D

41. Elements in the same vertical column has same
A. valence shell electronic configuration
B. electronic configuration
C. atomic number of isotopes
D. atomic size
Answer : A

42. Which of the following has highest ionisation energy?
A. Be
B. Cl
C. Ba
D. N
Answer : D

43. An atom of an element has electronic configuration $\left(Ar\right) 4s^{2}3d^5$, the element belongs to block
A. s
B. p
C. f
D. d
Answer : D

44. Ionisation energy of potassium is $425 kJ mo{l}^{-1}$. The minimum frequency of a photon that can effect the ionisation is
A. $96.5\times {10}^{15}se{c}^{-1}$
B. $1.065\times {10}^{14}se{c}^{-1}$
C. $1.065\times {10}^{12}se{c}^{-1}$
D. $1.065\times {10}^{15}se{c}^{-1}$
Answer : D

45. The lightest metal is
A. Li
B. Pb
C. Na
D. Al
Answer : A

46. Modem Periodic Law was given by
A. Joule
B. Moseley
C. Klechkosky
D. Meyer
Answer : B

47. Elements whose atoms have incompletely filled penultimate and anti-penultimate energy levels are known as
A. Inner Transition elements
B. Representative elements
C. Inert elements
D. Noble gases
Answer : A

48. The successive ionisation energies of an atom of an element A are:
$900 kJ mol{e}^1$, $1757 kJ mol{e}^{-1}$, $14850 kJ mol{e}^{-1}$ respectively. The element is most likely to be
A. B
B. Be
C. F
D. Ba
Answer : B

49. Arrange the following set of atoms in the increasing order of electron affinity: F, Sr, Ge, Se
A. Ge, Se, Sr. F
B. Se, Ge. Sr. F
C. Sr, Ge. Se. F
D. F, Sr, Ge. Se
Answer : C

50. Arrange the following set of atoms in the order of increasing atomic radius : F, Cl, C, O
A. F, Cl, O, C
B. C. O, F, Cl
C. O. C, F, Cl
D. F, O, C, Cl
Answer : D