Classification of Elements

Q1: The electronic configuration of the element with maximum electron affinity is

• 1 s², 2 s2, 2p³
• 1 s², 2 s2, 2p5
• 1 s², 2s², 2p6, 3 s2, 3p5
• 1 s², 2s², 2p6, 3 s², 3p³

Q2: Which is correct order for electron gain enthalpy?

• S < O < Cl < F
• O < S < F < Cl
• Cl < F < S < O
• F < Cl < O < S

Q3: The order of first electron affinity of O, S and Se is:

• O > S > Se
• S > Se > 0
• Se > O > S
• Se > S > 0

Q4: The correct order for electron affinity of B, C, N, O is

• O > C > N > B
• B > N > C > O
• O > C > B > N
• O > B > C > N

Q5: Select CORRECT order of electron affinity.

• O > S > P > Ca
• S > O > P > Ca
• S > O > Ca > P
• O > P > S > Ca

Q6: Match the Matrix Column I (Decreasing order) (1) I > Br > Cl > F (2) F > Cl > Br > I (3) Cl > F > Br > I (4) O > F > N > C Column II (Correct for) (P) First ionization energy (Q) Size (R) EA (electron affinity) (S) 2nd ionization energy

• 1 → Q; 2 → P, S; 3 → R; 4 → S
• 1 → S; 2 → Q; 3 → P, R; 4 → Q
• 1 → Q; 2 → P; 3 → S; 4 → R, S
• 1 → Q; 2 → R, S; 3 → P; 4 → R

Q7: The electron affinity values (in kJmol⁻¹) of three halogens X, Y and Z are respectively -349, -333 and -325. Then X, Y and Z respectively, are

• F, Cl and Br
• Cl, F and Br
• Cl, Br and F
• Br, Cl and F

Q8: The second electron affinity is zero for

• Alkali metals
• Halogens
• Noble gases
• Transition metal

Q9: Which of the following has least electron affinity?

• O
• N
• Ar
• F

Q10: Process. Na⁺(g) → Na(g) → Na(s)

• In (I) energy released. (II) energy absorbed
• In both (I) and (II) energy is absorbed
• In both (I) and (II) energy is released
• In (I) energy absorbed. (II) energy is released

Q11: Find the number of elements having lower E. A₂ than E. A₁ O, S, P, I, As, Si, Al, Li, K

Q12: Which arrangement represents the correct order of electron gain enthalpy (with a negative sign) of the given atomic species?

• S < O < Cl < F
• O < S < F < Cl
• Cl < F < S < O
• F < Cl < O < S