Periodic Classification of Elements MCQs

The periodic table is an organized arrangement of all known chemical elements. In the modern version, elements are ordered by increasing atomic number. This arrangement reveals observable periodic trends in the physical and chemical properties of elements, with patterns emerging within groups as you move from top to bottom and across periods from left to right. The periodic classification helps establish relationships between elements and predict the chemical properties and behavior of newly discovered elements.

Find the successive elements of the periodic table with ionisation energies, 2372, 520 and 890 kJ per mol respectively

(a) Li, Be, B
(b) H, He, Li
(c) B, C, N
(d) He, Li, Be

(d) He, Li, Be

The correct order of electronegativity is

(a) Cl > F > O > Br
(b) F > O > Cl > Br
(c) F > Cl > Br > O
(d) O > F > Cl > Br

(b) F > O > Cl > Br

Which of the following statements is incorrect?

(a) I.E.1 of O is lower than that of N but I.E.2 O is higher than that of N
(b) The enthalpy of N to gain an electron is almost zero but of P is 74.3 kJ mol^-1
(c) isoelectronic ions belong to the same period
(d) The covalent radius of iodine is less than its Van der Waal’s radius

(c) isoelectronic ions belong to the same period

5. Which of the reactions will need the maximum amount of energy?

(a) Na → Na+ + e–
(b) Ca+ → Ca++ + e–
(c) K+ → K+ ++ e–
(d) C2+ → C3+ + e–

(c) K+ → K+ ++ e–

For the same value of n, the penetration power of orbital follows the order

(a) s = p = d = f
(b) p > s > d > f
(c) f < d < p < s
(d) s < p < d < f

(c) f < d < p < s

10. Which one will have the highest 2nd ionisation energy?

(a) 1s2 2s2 2p6 3s1
(b) 1s2 2s2 2p4
(c) 1s2 2s2 2p6
(d) 1s2 2s2 2p6 3s2

(a) 1s2 2s2 2p6 3s1

Which one is the most acidic among these?

(a) MgO
(b) CaO
(c) Al2O3
(d) Na2O

(c) Al2O3

In the modern periodic table, the number of period of the element is the same as

(a) principal quantum number
(b) atomic number
(c) azimuthal quantum number
(d) atomic mass

(a) principal quantum number

Two different beakers contain M1-O-H, and M2-O-H solutions separately. Find the nature of the two solutions if the electronegativity of M1 = 3.4, M2 = 1.2, O = 3.5, H = 2.1

(a) acidic, acidic
(b) basic, acidic
(c) basic, basic
(d) acidic, basic

(d) acidic, basic

The correct order for the size of I, I+, I– is

(a) I > I– > I+
(b) I > I+ > I–
(c) I– > I > I+
(d) I+ > I– > I

(c) I– > I > I+