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Periodic Classification of Elements

Test your knowledge of periodic trends, atomic properties, ionization energy, electron affinity, and electronic configurations across the periodic table.

20 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Assertion (A) Fluorine has a less negative electron affinity than chlorine.Reason (R) There is relatively greater effectiveness of 2p-electrons in the small F atom to repel the additional electron entering theatom than to 3p-electrons in the larger Cl atom.

  1. Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
  3. (A) is true but (R) is false.
  4. (A) is false but (R) is true.
Question 2 Multiple Choice (Single Answer)

K+ , Cl-, Ca2+ and S2- ions are isoelectronic. The decreasing order of their size is

  1. S2- > Cl- > K+ > Ca2+
  2. Ca2+ > K+ > Cl- > S2-
  3. K+ > Cl- > Ca2+ > S2-
  4. Cl- > S2- > Ca2+ > K+
Question 3 Multiple Choice (Single Answer)

Of the following which has the smallest radius?

  1. Cs+
  2. Mg2+
  3. Na+
  4. Li+
Question 4 Multiple Choice (Single Answer)

The ionisation energy will be maximum for the process

  1. Ba →Ba++
  2. Be→ Be++
  3. Cs →Cs+
  4. Li →Li+
Question 5 Multiple Choice (Single Answer)

Atoms which have high values of first ionisation potential have

  1. large atomic radii
  2. low electronegativity
  3. have their octet filled
  4. low electron affinity
Question 6 Multiple Choice (Single Answer)

Correct arrangement of elements in respect to their size is

  1. Rb > Cs> Na >K
  2. Br > I > Cl> F
  3. Mg < Ca < Sr < Ba
  4. Na > Al > Mg > Ca
Question 7 Multiple Choice (Single Answer)

Which is the smallest atom among the following atoms : Na, Al, Cl, S

  1. Na
  2. Al
  3. Cl
  4. S
Question 8 Multiple Choice (Single Answer)

Among the halogens as you go from F to I, the electron affinity

  1. fluctuates
  2. increases
  3. decreases
  4. remains same
Question 9 Multiple Choice (Single Answer)

In the periodic table metals usually found as catalysts belong to the

  1. s-block
  2. p-block
  3. d-block
  4. f-block
Question 10 Multiple Choice (Single Answer)

When a cation is formed from a neutral atom, its size

  1. increases
  2. decreases
  3. remains same
  4. depends on the group to which the ion formed belongs
Question 11 Multiple Choice (Single Answer)

Smallest among these species is

  1. lithium ion
  2. lithium
  3. helium
  4. hydrogen
Question 12 Multiple Choice (Single Answer)

Assertion (A) SnCl2 is a reducing agent.
Reason (R) SnC12 reduces FeCl3 to FeCl2 and HgC12 to Hg.

  1. Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
  3. (A) is true but (R) is false.
  4. (A) is false but (R) is true.
Question 13 Multiple Choice (Single Answer)

The second ionisation energy is always greater than the first. This is because

  1. the effective nuclear charge increases
  2. the number of shells decrease
  3. the number of protons increase
  4. all are correct
Question 14 Multiple Choice (Single Answer)

Assertion (A) Sc (Z.= 21) is placed in d-block elements.
Reason (R) Last filling electron goes into 3d-suborbit.

  1. Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
  3. (A) is true but (R) is false.
  4. (A) is false but (R) is true.
Question 15 Multiple Choice (Single Answer)

Which one of the following is iso-electronic with a fluoride ion?

  1. Oxygen
  2. Fluorine
  3. Sodium
  4. Neon
Question 16 Multiple Choice (Single Answer)

The Third ionisation potential of an element is found to be very high compound to the first and second ionisation potentials. Thevalency of the element may be

  1. l
  2. 2
  3. 3
  4. 4
Question 17 Multiple Choice (Single Answer)

Assertion (A) PbCl2 is more stable than PbC14.
Reason (R) PbC14 is powerful oxidising agent.

  1. Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
  3. (A) is true but (R) is false.
  4. (A) is false but (R) is true.
Question 18 Multiple Choice (Single Answer)

In the following, the element with the highest ionisation energy is

  1. [Ne]3s2 3p3
  2. [Ne]3s2 3p1
  3. [Ne]3s2 3p4
  4. [Ne]3s2 3p2
Question 19 Multiple Choice (Single Answer)

Assertion (A) Na+ and Al3+ are isoelectronic but the magnitude of ionic radius of Al3+ is less than that of Na+.
Reason (R) The magnitude of effective nuclear charge of the outershell electrons in Al3+ is greater than that in Na+.

  1. Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
  3. (A) is true but (R) is false.
  4. (A) is false but (R) is true.
Question 20 Multiple Choice (Single Answer)

The outer most electronic configuration of an element is ns2 np3. In the periodic table the group to which the element belongs is

  1. 2
  2. 3
  3. 5
  4. 15
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