Students of class 11 Chemistry should refer to MCQ Questions Class 11 Chemistry Classification of Elements and Periodicity in Properties with answers provided here which is an important chapter in Class 11 Chemistry NCERT textbook. These MCQ for Class 11 Chemistry with Answers have been prepared based on the latest CBSE and NCERT syllabus and examination guidelines for Class 11 Chemistry. The following MCQs can help you to practice and get better marks in the upcoming class 11 Chemistry examination

Chapter 3 Classification of Elements and Periodicity in Properties MCQ with Answers Class 11 Chemistry

MCQ Questions Class 11 Chemistry Classification of Elements and Periodicity in Properties provided below have been prepared by expert teachers of grade 11. These objective questions with solutions are expected to come in the upcoming Standard 11 examinations. Learn the below provided MCQ questions to get better marks in examinations.

Question. The statement that is not correct for the periodic classification of elements, is
(a) the properties of the elements are the periodic function of their atomic number
(b) non-metallic elements are lesser in number than metallic elements
(c) the first ionisation energies of elements along a period do not vary in a regular manner with increase in atomic number
(d) for transition elements the d-subshells are filled with electrons monotonically with increase in atomic numbers

Question. Generally the first ionisation energy increases along a period. But there are some exceptions. One which is not an exception is
(a) N and O
(b) Na and Mg
(c) Mg and Al
(d) Be and B

Question. The increasing order of the ionic radii of the given isoelectronic species is 
(a) Cl⁻² , Ca²⁺ , K⁺ , S²⁻
(b) S²⁻, Cl⁻ , Ca²⁺ , K⁺
(c) Ca²⁺ , K⁺ , Cl⁻ , S²⁻
(d) K⁺ , S² , Ca²⁺ , Cl⁻

Question. What will be the electronegativity of carbon at Pauling scale?
Given that E_H—H = 104.2 kcal mol⁻¹,
E_{C— C} = 83.1kcal mol⁻¹
E_C—H = 98 8 . kcal mol⁻¹
 Electronegativity of hydrogen = 2.1
(a) 0.498
(b) 0.598
(c) 2.134
(d) 2.598

Question. The correct sequence which shows decreasing order of the ionic radii of the elements is 
(a) Al³⁺ > Mg²⁺ > Na⁺ > ^F– > O^2–
(b) Na⁺ > Mg²⁺ > Al³⁺ > O^2– > F^– 
(c) Na⁺ > F^– > Mg²⁺ > O2^– > Al³⁺
(d) O^2– > F^– > Na⁺ > Mg²⁺ > Al³⁺ 

Question. Which of the following properties shows a clear periodic variation along a group?
(a) First ionisation energy
(b) Molar mass of the element
(c) Number of isotopes of the atom
(d) All of the above

Question. Which one of the following ions has the highest value of ionic radius?
(a) Li⁺
(b) B³⁺
(c) F⁻
(d)O²⁻

Question. Which of the following series of elements have nearly the same atomic radii?
(a) F, Cl, Br, I
(b) Na, K, Rb, Cs
(c) Li, Be, B, C
(d) Fe, Co, Ni, Cu

Question. Chloride ion and potassium ion are isoelectronic, then
(a) their sizes are same
(b) Cl⁻ ion is bigger than K⁺ ion
(c) K⁺ ion is relatively bigger
(d) their sizes depend on other cation and anion

Question. Atomic radii of fluorine and neon (in Å) are respectively given by
(a) 0.72, 1.60
(b) 1.60, 1.60
(c) 0.72, 0.72
(d) None of these

Question. Which of the following atoms has the highest firstionisation energy? 
(a) Na
(b) K
(c) Sc
(d) Rb

Q uestion. Which of the following represents the correct order of increasing first ionisation enthalpy for Ca, Ba, S, Se and Ar?
(a) S < Se < Ca < Ba < Ar
(b) Ba < Ca < Se < S < Ar
(c) Ca < Ba < S < Se < Ar
(d) Ca < S < Ba < Se < Ar

Question. Following statements regarding the periodic trends of chemical reactivity to the alkali metals and the halogens are given. Which of these statements give the correct picture?
(a) The reactivity decreases in the alkali metals but increases in the halogens with increase in atomic number down the group
(b) In both the alkali metals and the halogens the chemical reactivity decreases with increase in atomic number down the group
(c) Chemical reactivity increases with increase in atomic number down the group in both the alkali metals and halogens
(d) In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group

Question. AB is predominantly ionic as A⁺ B⁻ if (IE stands for ionisation energy, EA for electron affinity and EN for electronegativity). Then,
(a) (IP)_A < (IP)_B 
(b) (EA)_A < (EA)_B 
(c) (EN)_A < (EN)_B 
(d) (IP)_B < (IP)_A

Question. Which is the correct order of second ionisation potential of C, N, O and F in the following?
(a) O > N > F > C
(b) O > F > N > C
(c) F > O > N > C
(d) C > N > O > F

Question. In which of the following arrangements the order is not according to the property indicated against it ?
(a) Li < Na < K < Rb : increasing metallic radius
(b) I < Br < F < Cl : increasing electron gain enthalpy (with negative sign)
(c) B < C < N < O : increasing first ionisation enthalpy
(d) Al³⁺ < Mg²⁺ <Na⁺ <F⁻: increasing ionic size

Question. A, B, C are elements in the third short period. Oxide of A is ionic, that of B is amphoteric and of C a giant molecule. A, B and C will have atomic number in the order
(a) A < B < C
(b) C < B < A
(c) A < C < B
(d) B < A < C

Question. The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy ofNa+ will be 
(a) − 5.1 eV
(b) − 10.2 eV
(c) + 2.55 eV
(d) − 2.55 eV

Question. The atomic numbers of vanadium (V), chromium (Cr), manganese (Mn) and iron (Fe) are respectively 23, 24, 25 and 26. Which one of these may be expected to have the highest second ionisation enthalpy ?
(a) V
(b) Cr
(c) Mn
(d) Fe

Question. The IE values of Al(g) → Al⁺ +e⁻ is 577.5 kJ mol⁻¹ and ΔH for Al(g) → Al⁺³ (g) + 3e⁻ is 5140 kJ mol⁻¹. If the ratio of second and third IE is 2 : 3, the values of IE₂ and IE₃ are respectively
(a) 1825 and 2737.5 kJmol ⁻¹
(b) 182.5 and 273.75 kJmol ⁻¹
(c) 1825 and 2700 Jmol ⁻¹
(d) 2737.5 and 1825 kJmol ⁻¹

Question. The correct order of first ionisation potential of carbon, nitrogen, oxygen and fluorine is
(a) C > N > O > F
(b) O > N > F > C
(c) O > F > N > C
(d) F > N > O > C

Question. Two elements whose electronegativities are 1.2 and 3.0, the bond formed between them would be
(a) ionic
(b) covalent
(c) coordinate
(d) metallic

Question. The successive ionisation energy values for an element are given below:
I. 1st ionisation energy = 410 kJ mol⁻¹
II. 2nd ionisation energy = 820 kJ mol⁻¹
III. 3rd ionisation energy = 1100 kJ mol⁻¹
IV. 4th ionisation energy = 1500 kJ mol⁻¹
V. 5th ionisation energy = 3200 kJ mol⁻¹
Find out the number of valence electron for the atom x.
(a) 4
(b) 3
(c) 5
(d) 2

Question. Valence electrons in the element A are 3 and that in element B are 6. Most probable compound formed from A and B is
(a) A₂ B
(b) A₂ B
(c) A₆ B₃
(d) A₂ B₃

Question. Which among the following factors is the most important in making fluorine the strongest oxidising agent ?
(a) Electron affinity
(b) Ionisation enthalpy
(c) Hydration enthalpy
(d) Bond dissociation energy

Question. Mixture containing aqueous Li⁺ , Na⁺ , K⁺ ions are electrolysed. Cations are discharged at cathode in the order
M⁺(aq) + e¯ → M
(a) Li⁺ , Na⁺ , K⁺
(b) K⁺ , Na⁺ , Li⁺
(c) Li⁺ , K⁺ , Na⁺
(d) Na⁺ , K⁺ , Li⁺

Question. The incorrect statements among the following is
(a) the first ionisation potential of Al is less than the first ionisation potential of Mg
(b) the second ionisation potential of Mg is greater than the second ionisation potential of Na
(c) the first ionisation potential of Na is less than the first ionisation potential of Mg
(d) the third ionisation potential of Mg is greater than the third ionisation potential of Al

Question. The first ionisation potential of Na,Mg and Si are respectively 496,737 and 786 kJmol⁻¹. The ionisation potential of Al will be closer to
(a) 760 kJmol ¹⁻
(b) 575 kJmol ¹⁻
(c) 801 kJmol ¹⁻
(d) 419 kJmol ¹⁻

Question. Match the element (in Column I) with its unique properties (in Column II).
Column I Column II
A. F 1. Maximum ionisation energy
B. Cl 2. Maximum electronegativity
C. Fe 3. Maximum electron affinity
D. He 4. Recently named by IUPAC
E. Ds 5. Variable valence
Codes
A B C D E
(a) 5 4 1 2 3
(b) 3 4 2 1 5
(c) 2 3 5 1 4
(d) 3 1 4 2 5

Question. The element with which of the following outer electron configuration may exhibit the largest number of oxidation states in its compounds 
(a) 3d⁵ 4s²  
(b) 3d⁴ 8s² 
(c) 3d⁴ 7s²
(d) 3d⁴ 6s² 

Question. Considering the elements F, Cl, O and N, the correct order of their chemical reactivity in terms of oxidising property is
(a) F> Cl> O> N
(b) F> O> Cl> N
(c) Cl> F> O> N
(d) O> F> N> Cl

Question. The formation of the oxide ion,O²⁻ (g) from oxygen atom requires first an exothermic and then an endothermic step as shown below:
O(g) + e⁻ → O⁻(g); ΔH^Θ = − 141 kJ mol⁻¹
O⁻(g)+ e⁻ → O⁻ (g) ΔH^Θ = + 780 kJ mol⁻¹ 
Thus, process of formation ofO²⁻ in gas phase is unfavourable even thoughO²⁻ is isoelectronic with neon. It is due to the fact that,
(a) oxygen is more electronegative
(b) addition of electron in oxygen results in larger size of the ion
(c) electron repulsion outweights the stability gained by achieving noble gas configuration
(d) O⁻ ion has comparatively smaller size than oxygen atom

Question. The increasing order of the first ionisation enthalpies of the elements B, P, S, and F is
(a) F < S < P < B
(b) P < S < B < F
(c) B < P < S < F
(d) B < S < P < F

Question. The atomic number of elements A, B, C and D are Z −1, Z, Z + 1 and Z + 2 respectively. If B is a noble gas, choose the correct option from the following options.
I. A has highest electron affinity
II. C exists in +2 oxidation state
III. D is an alkaline earth metal
(a) I and II
(b) II and III
(c) I and III
(d) I,II and III

Question. Ionisation potential and electron affinity of fluorine are 17.42 and 3.45 eV respectively. What will be the ratio of electronegativity of fluorine on Mulliken scale and Pauling scale ?
(a) 2.80 : 1
(b) 1.80 : 1
(c) 2.40 : 1
(d) 4.20 : 1

Question. The period number in the long form of the periodic table is equal to
(a) magnetic quantum number of any element of the period
(b) atomic number of any element of the period
(c) maximum principal quantum number of any element of the period
(d) maximum azimuthal quantum number of any element of the period

Question. Which pair of atomic number of elements has same chemical properties?
(a) 13, 22
(b) 3, 11
(c) 4, 24
(d) 2, 4

Question. An extra electron is added at the periphery of nitrogen atom in the formation of anion. What will be the ratio of effective nuclear charge of nitrogen atom and nitrogen anion ?
(a) 2.09 : 1
(b) 0.09 : 1
(c) 3.09 : 1
(d) 1.09 : 1

Question. Following transition elements (IE)1 drops abruptly (Ga, In and Tl). This is due to
(a) decrease in effective nuclear charge
(b) increase in atomic radius
(c) removal of an electron from the singly occupied np-orbitals of higher energy than the ns-orbitals of Zn, Cd and Hg
(d) None of the above is correct

Question. Consider the following statements.
I. Cs⁺ is highly hydrated than the other alkali metal ions.
II. Among the alkali metals Li, Na, K and Rb, lithium has the highest melting point.
III. Among the alkali metals only lithium forms a stable nitride by direct combination.
Of these statements
(a) I, II and III are correct
(b) I and II are correct
(c) I and III are correct
(d) II and III are correct

Question. The ionsO²⁻ , F⁻,Na⁺ ,Mg²⁺ and Al³⁺ are isoelectronic. Their ionic radii show
(a) an increase fromO²⁻ to F ⁻ and then decrease from Na⁺ to Al³⁺
(b) a decrease fromO²⁻ to F⁻ and then increase fromNa⁺ to Al³⁺
(c) a significant increase fromO²⁻ to Al³⁺
(d) a significant decrease fromO²⁻ to Al³⁺

Question. The ionic radii (in A °) of N³⁻ ,O ²⁻  and F⁻ respectively are
(a) 1.36,1.40 and 1.71
(b) 1.36,1.71 and 1.40
(b) 1.71,1.40 and 1.36
(d) 1.71,1.36 and 1.40

Question. Both lithium and magnesium display several similar properties due to the diagonal relationship: however, the one which is incorrect is 
(a) both form basic carbonates
(b) both form soluble bicarbonates
(c) both form nitrides
(d) nitrates of both Li and Mg yield NO₂ and O₂ on heating

We hope the above multiple choice questions for Class 11 Chemistry for Chapter 3 Classification of Elements and Periodicity in Properties provided above with answers based on the latest syllabus and examination guidelines issued by CBSE, NCERT and KVS are really useful for you. Classification of Elements and Periodicity in Properties is an important chapter in Class 11 as it provides very strong understanding about this topic. Students should go through the answers provided for the MCQs after they have themselves solved the questions. All MCQs have been provided with four options for the students to solve. These questions are really useful for benefit of class 11 students. Please go through these and let us know if you have any feedback in the comments section.