Please refer to Chapter 3 Classification of Elements and Periodicity in Properties MCQ Class 11 Chemistry with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 11 Chemistry. Students should refer to MCQ Questions for Class 11 Chemistry with Answers to score more marks in Grade 11 Chemistry exams. Students should read the chapter Classification of Elements and Periodicity in Properties and then attempt the following objective questions.

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

The Classification of Elements and Periodicity in Properties MCQ Class 11 Chemistry provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. The electron affinity of Be is almost similar to that of
(a) Li
(b) B 
(c) Na
(d) Ne   

Question. Smallest among these species is
(a) lithium
(b) lithium ion
(c) hydrogen
(d) helium       

Question. Ionisation energy and electron affinity are defined at
(a) enthalpy
(b) spontaneity
(c) equilibrium
(d) absolute zero       

Question. The discovery of which of the following group of elements gave death blow to the Newland’s law of octaves?
(a) Inert gases
(b) Alkaline earths 
(c) Rare earths
(d) Actinides   

Question. The general electronic configuration of the transition elements is 
(a) (n – l)d¹⁰, (n + 1)s²
(b) (n – I )d^1-10, (n + 1)s^1-2
(c) (n – l)d^1-10, np⁶, ns²
(d) (n – l)d^1-10,ns^1-2       

Question. An element with atomic number 21 is a 
(a) halogen
(b) representative element
(c) transition element
(d) alkali metal       

Question. Which pair has both members from the same period of pe1iodic table?
(a) Cl, Br
(b) Ca, Cl
(c) Na, Ca
(d) Na, Cl       

Question. The only non-metal which is liquid at ordinary temperature is 
(a) Hg
(b) Br₂
(c) NH₃
(d) None of these       

Question. Number of elements presents in the fifth period of periodic table is 
(a) 32
(b) lO
(c) 18
(d) 8     

Question. The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na⁺ will be 
(a) – 2.55eV
(b) – 5.leV
(c) – 10.2eV
(d) + 2.55eV     

Question. The element with atomic number 117 if discovered would be placed in 
(a) noble gas family
(b) alkali family
(c) alkaline earth family
(d) halogen family     

Question. The element with atomic number 36 belongs to …… block in the periodic table. 
(a) p
(b) s
(c) f
(d) d     

Question. The first ionisation potential of Na, Mg and Si are respectively 496, 737 and 786 kJ mol^-1 . The ionisation potential of Al will be closer to
(a) 760 kJ mol-¹
(b) 575 kJ mol^-1
(c) 801 kJ mol^-1
(d) 4 19 kJ mol^-1       

Question. The increasing order of the atomic radius of Si, S, Na, Mg, Al is 
(a) S < Si < Al < Mg < Na
(b) Na < Al < Mg < S < Si
(c) Na < Mg < Si < Al < S
(d) Na < Mg < Al < Si < S       

Question. Which among the following bas the highest ionisation potential? 
(a) B
(b) Li
(c) Ne
(d) F       

Question. Which of the following have the largest ionic size?
(a) F^–
(b) O^2- 
(c) Na⁺
(d) Mg²⁺       

Question. Beryllium shows diagonal relationship with 
(a) B
(b) Mg
(c) Al
(d) Na       

Question. The correct order of ionisation energy ofC, N, 0 and Fis
(a) C < N < 0 < F
(b) C < 0 < N < F 
(c) F < 0 < N < C
(d) F < N < C < 0       

Question. The correct order of acidic strength is
(a) K₂O > CaO > MgO
(b) CO₂ > N₂O₅ > SO₃
(c) Na₂O > MgO > Al₂O₃
(d) Cl₂O₇ > SO₂ > P₄O₁₀       

Question. Which of the following statements is wrong?
(a) The stability ofhydrides increases from NH3 to BiH3 in group 15 of the periodic table
(b) Nitrogen cannot fom1 dn- pn bond
(c) Single N-N bond is weaker than the single P-P bond
(d) N₂O₄ has two resonance structure.           

Question. Be and Al exhibit diagonal relationship. Which of the following statements about them is/are not true?
I. Both react with HCI to liberate H₂.
II. They are made passive by HNO₃•
III. Their carbides gives acetylene on treatment with water.
IV. Their oxides are amphoteric. 
(a) III and rv
(b) I and III
(c) Only I
(d) Only III   

Question. The correct decreasing order of first ionisation enthalpies of five elements of the second period is 
(a) Be > B > C > N > F
(b) N > F > C > B > Be
(c) F > N > C > Be > B
(d) N > F > B > C > Be
(e) F > C > N > B > Be       

Question. Which one of the following has the lowest ionisation energy? 
(a) Is²2s²2p⁶
(b) Is²2s²2p⁶3s¹
(c) Is²2s²2p⁵
(d) Is²2s²2p³     

Question. In which of the following arrangements, the sequence is not strictly according to the property written against it?
(a) CO₂ < SiO₂ < SnO₂ < PbO₂ : increasing oxidising power 
(b) HF < HCI < HBr < HI : increasing acid strength
(c) NH₃ > PH₃ < AsH₃ < SbH₃ : increasing basic strength
(d) B < C < 0 < N : increasing first ionisation enthalpy        

Question. The set representing the correct order of ionic radius is
(a) Li⁺ > Be²⁺ > Na⁺ > Mg²⁺ 
(b) Na⁺ > Li⁺ > Mg²⁺ > Be²⁺
(c) Li⁺ > Na⁺> Mg²⁺ > Be²⁺
(d) Mg²⁺ > Be²⁺ > Li⁺> Na⁺     

Question. The oxide of an element whose electronic configuration is 1s² ,2s² ,2p⁶ ,3s¹ IS 
(a) neutral
(b) amphoteric
(c) basic
(d) acidic   

Question. What is the correct decreasing order of ionic radiius of following ions?
N^3- , O^2- ‘ F^– , Na⁺ , Mg²⁺ 
(a) N^3- > O^2- > F^– > Mg²⁺> Na⁺
(b) N^3- > O^2- > F^– > Na⁺ > Mg²⁺
(c) N^3- > O^2- > Mg²⁺ > Na⁺ > F^–
(d) Na⁺ > F^–> O^2- > Mg²⁺ > N^3-       

Question. Which of the following oxides is most acidic in nature?
(a) BeO
(b) MgO
(c) Cao   
(d) BaO   

Question. Which is not the correct order for the stated property?
(a) Ba > Sr > Mg; atomic radius
(b) F > O > N; first ionisation enthalpy
(c) Cl > F > I; electron affinity
(d) O > Se > Te; electronegativity    

Question. The atomic numbers 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 answer from the following statements.
I. A has hig her electron affinity.
II. C exists in +2 oxidation state.
III. D is an alkaline earth metal.
(a) I and II
(c) I and III
(b) II and III
(d) I, II and III     

Question. If the electronegativity difference between two atoms A and Bis 2.0, then the percentage of covalent character in the molecule is
(a) 54%
(b) 46%
(c) 23%
(d) 72%     

Question. Which one of the following statements is false? 
(a) The electron affinity of chlorine is less than that of mfluorine
(b) The electronegativity of fluorine is more than that of chlorine
(c) The electron affinity of bromine is less than that of chlorine
(d) The electronegativity of chlorine is more than that of bromine     

Question. The correct order in which the first ionisation potential increases is 
(a) Na < K < Be
(c) K< Be < Na
(b) K < Na < Be
(d) Be < Na < K     

Question. The electronic configuration of the element with maximum electron affinity is 
(a) 1s², 2s²‘ 2p³
(b) 1s² ‘ 2s² ‘2p⁵
(c) 1s² ,2s² , 2p⁶ , 3s² , 3p⁵
(d) 1s² , 2s² ,2p⁶ ,3s² ,3p³     

Question. The electronic configurations of four elements are given below. Arrange these elements in the correct order of the magnitude (without sign) of their electron affinity.
I. 2s²2p⁵
II. 3s²3p⁵
III. 2s²2⁴
IV. 3s²3⁴
Select the correct answer using the codes given below
(a) I < II < IV < III 
(b) II < I < IV < III
(c) I < III < IV < II
(d) III < IV < I < II       

Question. Generally, the first ionisation energy increases along a pe1iod. 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 electronic configuration of the atom having maximum difference in first and second ionisation energies is
(a) 1s², 2s²‘ 2p³ ,3s¹
(b) 1s² ‘ 2s² ‘2p⁶ .3s¹
(c) 1s² ,2s² , 2p¹, 
(d) 1s² , 2s² ,2p⁶ ,3s² ,3p¹     

Question. Increase in atomic size down the group is due to
(a) increase in number of electrons
(b) increase in number of protons and neutrons
(c) increase in number of protons
(d) increase in number of protons, neutrons and electrons         

Question. In the following, the element with the highest ionisation energy is
(a) [Ne] 3s² , 3p¹
(c) [Ne] 3s² , 3p²
(b) [Ne] 3s², 3p³
(d) [Ne] 3s², 3p⁴     

Question. Which one of the following is an amphoteric oxide?
(a) ZnO
(b) Na2O 
(c) SO2
(d) B2O3     

Question. The electron affinity values (in kJ mol^-1) of three halogens X , Y and Z are respectively -349, – 333 and -325. Then, X, Y and Z respectively, are 
(a) F₂ , Cl₂ and Br₂
(b) Cl₂ , F₂ and Br₂
(c) Cl₂ , Br₂ and F₂
(d) Br₂ , Cl₂ and F₂         

Question. Which of the following is an amphoteric oxide?
(a) SO₃
(b) MgO
(c) AlO₃
(d) P₄O₁₀     

Question. The first ionisation potential ofNa, Mg, Al and Si are in the order 
(a) Na < Mg > Al < Si
(c) Na < Mg < Al > Si
(b) Na > Mg> Al < Si
(d) Na > Mg> Al < Si         

Question. Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species ?
(a) Cl < F < S < O
(b) O < S < F < Cl
(c) S < O < Cl < F
(d) F < Cl < O < S         

Question. The electronic configuration of most electronegative elements is 
(a) 1s² , 2s² , 2p⁵
(b) 1s² , 2s² ‘ 2p⁴ ‘ 3s¹
(c) 1s² , 2s² , 2p⁶ ,3s¹ , 3p⁵
(d) 1s2 , 2s² ,2p⁶ ,3s² ,3p⁵     

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

Question. The ionic radius (A) of C^4- and O^2- respectively, are 2.60 and 1.40. The ionic radius of the isoelectronic ion N^3- would be 
(a) 2.6
(b) 1.71
(c) 1 .4
(d) 0.95     

Question. Following statements regarding the periodic trends of chemical reactivity to the alkali metals and the halogens are given. Which of these statements gives 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 b ut in the halogens it decreases with increase in atomic number down the group   

Question. Which is chemically most active non-metal? 
(a) S
(b) O₂
(c) F₂
(d) N2     

Question. Which one of the following has maxinrnm ionisation potential? 
(a) K
(b) Be
(c) Na
(d) Mg       

Question. Which of the following is a false statement?
(a) Fluorine is more electronegative than chlorine
(b) Nitrogen has greater IE than oxygen
(c) Lithium is amphoteric
(d) Chlorine is an oxidising agent   

Question. Observe the following statements.
I. The physical and chemical properties of elements are periodic functions of their electronic configuration.
II. Electronegativity of fluorine is less than the electronegativity of chlorine.
III. Electropositive nature decreases from top to bottom in a group. The correct answer is
(a) I, II and III
(c) I and II
(b) Only I
(d) II and III       

Question. Ionisation energy in group 1-A varies in the decreasing order as 
(a) Li > Na> K > Cs
(b) Na > Li > K > Cs
(c) Li > Cs > K > Na
(d) K > Cs > Na > Li     

Question. Identify the correct order in which the covalent radius of the following elements increases
     I. Ti      II. Ca      III. Sc 
(a) I, II and III
(b) III, II and I
(c) II, I and III 
(d) I, III and II       

Question. The correct order of electron affinity is 
(a) B < C < O > N
(b) B > C > N > O
(c) O > C > B > N
(d) O < C < B < N       

Question. The set representing the correct order of first ionisation energy is 
(a) K > Na > Li
(b) Be > Mg > Ca
(c) B > C > N
(d) Ge > Si > C     

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