Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity MCQs for NEET

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Questions
1 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

Answer:1s2 2s2 2p6 3s1
2 Which one is the most acidic among these?
A MgO
B CaO
C Al2O3
D Na2O

Answer: Al2O3
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3 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

Answer:acidic, basic
4 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

Answer:F > O > Cl > Br
5 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

Answer: isoelectronic ions belong to the same period
6 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–

Answer:K+ → K+ ++ e–
7 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

Answer:f < d < p < s
8 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

Answer:I– > I > I+
9 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

Answer:principal quantum number
10 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

Answer:He, Li, Be
11 How Many Elements are there in the 5th Period?
A 18.
B 10.
C 32.
D 8.

Answer:18.
12 Which One is a Metalloid?
A Sb.
B Zn.
C Bi.
D Pb.

Answer:Sb.
13 How Many Rare Earth Elements are there?
A 14.
B 8.
C 10.
D 32.

Answer:14.
14 Which all Elements do have ns2 np6 Outer Electronic Configuration?
A Chalcogens.
B Alkaline earth.
C Noble gasses.
D Transition elements.

Answer:Noble gasses.
15 Which Block Does Refer to all the Non-metal Elements?
A P-block.
B D-block.
C F-block.
D S-block.

Answer:P-block.
16 Which One is the Lightest Among the Following Metals?
A Ca.
B Li.
C Na.
D Mg.

Answer:Li.
17 What Does Determine the Chemical Behaviour of Atoms?
A Binding energy.
B Isotope numbers.
C Mass number.
D Atomic number.

Answer:Atomic number.
18 The Right Side of the Periodic Table Refers to
A Non-metals.
B Metalloids.
C Metals.
D Transition elements.

Answer:Non-metals.
19 Which Atomic Number Refers to a Metal?
A 38
B 36
C 32
D 34

Answer:38
20 Which Elements do Display Diagonal Relationship?
A Al and B.
B C and B.
C Ga and B.
D Si and B.

Answer: Si and B.

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