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

Please refer to MCQ Questions Classification of Elements and Periodicity in Properties for Chapter 3 Class 11 Chemistry given below. All MCQ questions are provided with answers. These MCQ Questions for Class 11 Chemistry are designed based on the chapters given in your CBSE NCERT Textbook for Class 11 Chemistry. These MCQ Questions are expected to come in your class 11 Board exams.

Question. An atom has electronic configuration 1s² 2s² 2p⁶ 3s2 3p⁶ 3d³ 4s², you will place it in
(a) fifth group
(b) fifteenth group
(c) second group
(d) third group. 

Question. The electronic configuration of an element is 1s² 2s² 2p⁶ 3s² 3p³. What is the atomic number of the element, which is just below the above element in the periodic table?
(a) 36
(b) 49
(c) 33
(d) 34

Question. If the atomic number of an element is 33, it will be placed in the periodic table in the
(a) first group
(b) third group
(c) fifth group
(d) seventh group.

Question. The electronic configuration of four elements are given below. Which elements does not belong to the same family as others?
(a) [Xe]4f ¹⁴5d¹⁰4s²
(b) [Kr]4d¹⁰5s²
(c) [Ne]3s²³p⁵
(d) [Ar]3d¹⁰4s²

Question. Identify the incorrect match.
Name IUPAC Official Name
(A) Unnilunium (i) Mendelevium
(B) Unniltrium (ii) Lawrencium
(C) Unnilhexium (iii) Seaborgium
(D) Unununnium (iv) Darmstadtium
(a) (A), (i)
(b) (B), (ii)
(c) (C), (iii)
(d) (D), (iv)

Question. The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration?
(a) Carbon family, [Rn] 5f ¹⁴ 6d¹⁰ 7s² 7p²
(b) Oxygen family, [Rn] 5f ¹⁴ 6d¹⁰ 7s² 7p⁴
(c) Nitrogen family, [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁶
(d) Halogen family, [Rn] 5f ¹⁴ 6d¹⁰ 7s2 7p⁵

Question. Match the oxide given in column I with its property given in column II.
Column I Column II
(i) Na2O A. Neutral
(ii) Al₂O₃  B. Basic
(iii) N₂O C. Acidic
(iv) Cl₂O₇  D. Amphoteric
Which of the following options has all correct pairs?
(a) (i)-B, (ii)-A, (iii)-D, (iv)-C
(b) (i)-C, (ii)-B, (iii)-A, (iv)-D
(c) (i)-A, (ii)-D, (iii)-B, (iv)-C
(d) (i)-B, (ii)-D, (iii)-A, (iv)-C 

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

Question. Which of the following orders of ionic radii is correctly represented? None
(a) H^– > H⁺ > H
(b) Na⁺ > F^– > O^2–
(c) F– > O^2– > Na⁺
(d) Al³⁺ > Mg²⁺ > N^3–

Question. For the second period elements the correct increasing order of first ionization enthalpy is
(a) Li < Be < B < C < O < N < F < Ne
(b) Li < Be < B < C < N < O < F < Ne
(c) Li < B < Be < C < O < N < F < Ne
(d) Li < B < Be < C < N < O < F < Ne

Question. Which one of the following arrangements represents the correct order of least negative to most negative electron gain enthalpy for C, Ca, Al, F and O?
(a) Al < Ca < O < C < F
(b) Al < O < C < Ca < F
(c) C < F < O < Al < Ca
(d) Ca < Al < C < O < F

Question. In which of the following arrangements the given sequence is not strictly according to the property indicated against it?
(a) HF < HCl < HBr < HI : increasing acidic strength
(b) H₂O < H₂S < H2Se < H₂Te : increasing pKa values
(c) NH₃ < PH₃ < AsH₃ < SbH₃ : increasing acidic character
(d) CO₂ < SiO₂ < SnO₂ < PbO₂ : increasing oxidising power

Question. Identify the wrong statement in the following.
(a) Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius.
(b) Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius.
(c) Atomic radius of the elements increases as one moves down the first group of the periodic table.
(d) Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the periodic table.

Question. Which of the following oxides is amphoteric?
(a) SnO₂
(b) CaO
(c) SiO₂
(d) CO₂

Question. The correct order of the decreasing ionic radii among the following isoelectronic species is
(a) Ca²⁺ > K⁺ > S^2– > Cl–
(b) Cl– > S^2– > Ca²⁺ > K⁺
(c) S^2– > Cl– > K⁺ > Ca²⁺
(d) K⁺ > Ca²⁺ > Cl^– > S^2– 

Question. Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl?
(a) Cl < F < O < S
(b) O < S < F < Cl
(c) F < S < O < Cl
(d) S < O < Cl < F

Question. Among the elements Ca, Mg, P and Cl, the order of increasing atomic radii is
(a) Mg < Ca < Cl < P
(b) Cl < P < Mg < Ca
(c) P < Cl < Ca < Mg
(d) Ca < Mg < P < Cl

Question. What is the value of electron gain enthalpy of Na⁺ ifIE₁ of Na = 5.1 eV?
(a) –5.1 eV
(b) –10.2 eV
(c) +2.55 eV
(d) +10.2 eV 

Question. Among the following which one has the highest cation to anion size ratio?
(a) CsI
(b) CsF
(c) LiF
(d) NaF

Question. With which of the following electronic configuration an atom has the lowest ionisation enthalpy?
(a) 1s² 2s² 2p³
(b) 1s² 2s² 2p⁵ 3s¹
(c) 1s² 2s² 2p⁶
(d) 1s² 2s² 2p⁵ 

Question. Which one of the following ionic species has the greatest proton affinity to form stable compound?
(a) NH₂ –
(b) F–
(c) I–
(d) HS–

Question. Which of the following is the most basic oxide?
(a) SeO₂
(b) Al₂O₃
(c) Sb₂O₃
(d) Bi₂O₃ 

Question. What is the correct relationship between the pH of isomolar solutions of sodium oxide, Na₂O (pH₁), sodium sulphide, Na₂S (pH₂), sodium selenide, Na₂Se (pH₃) and sodium elluride Na₂Te (pH₄)?
(a) pH₁ > pH₂ > pH₃ > pH₄
(b) pH₁ > pH₂ ≈ pH₃ > pH₄
(c) pH1 < pH₂ < pH₃ < pH₄
(d) pH₁ < pH₂ < pH₃ ≈ pH₄ 

Question. Amongst the elements with following electronic configurations, which one of them may have the highest ionisation energy?
(a) Ne [3s² 3p²]
(b) Ar [3d¹⁰ 4s2 4p³]
(c) Ne [3s² 3p1]
(d) Ne [3s² 3p³] 

Question. Identify the correct order of the size of the following.
(a) Ca²⁺ < K⁺ < Ar < Cl– < S^2–
(b) Ar < Ca²⁺ < K⁺ < Cl^– < S^2–
(c) Ca²⁺ < Ar < K⁺ < Cl^– < S^2–
(d) Ca²⁺ < K⁺ < Ar < S^2– < Cl^–

Question. Ionic radii are
(a) inversely proportional to effective nuclear charge
(b) inversely proportional to square of effective nuclear charge
(c) directly proportional to effective nuclear charge
(d) directly proportional to square of effective nuclear charge.

Question. Correct order of 1^st ionisation potential among following elements Be, B, C, N, O is
(a) B < Be < C < O < N
(b) B < Be < C < N < O
(c) Be < B < C < N < O
(d) Be < B < C < O < N 

Question. If the two members of a Dobereiner triad are phosphorus and antimony, the third member of this triad is
(a) arsenic
(b) sulphur
(c) iodine
(d) calcium

Question. The law of triads is applicable to a group of
(a) Cl, Br, I
(b) C, N, O
(c) Na, K, Rb
(d) H, O, N

Question. In 1800, only ….X…. elements were known. Here, X refers to
(a) 63
(b) 31
(c) 114
(d) 92

Question. Johann Doberiner gave the idea of trends among physical and …X… of several groups of three elements. Here, X refers to
(a) atomic number
(b) atomic mass
(c) chemical properties
(d) None of these

Question. The elements with zero electron affinity are
(a) Boron and Carbon
(b) Beryllium and Helium
(c) Lithium and Sodium
(d) Fluorine and Chlorine

Question. Periodic classification of elements is used to examine the
(a) periodic trends in physical properties of elements
(b) periodic trends in chemical properties of elements
(c) Both (a) and (b)
(d) None of the above

Question. Cl, Br, I, if this is Dobereiner’s triad and the atomic masses of Cl and I are 35.5 and 127 respectively the atomic mass of Br is
(a) 162.5
(b) 91.5
(c) 81.25
(d) 45.625

Question. According to Newlands theory, when elements are arranged in the order of increasing atomic weight which number element had similar properties to the first element.
(a) third
(b) seventh
(c) eighth
(d) sixth

Question. Lothar Meyer plotted the physical properties such as atomic volume, melting point and …X… against atomic weight. Here, X refers to
(a) mass
(b) boiling point
(c) surface tension
(d) None of these

Question. The most significant contribution towards the development of periodic table was made by
(a) Mendeleev
(b) Avogadro
(c) Dalton
(d) Cavendish

Question. Noble gases were included in Mendeleev’s periodic table in the
(a) 1st group
(b) 7th group
(c) 8th group
(d) None of these

Question. On which of the following Dobereiner’s Triad law is not applicable?
(a) Cl, Br, I
(b) Ca, Sr, B
(c) F, Cl, Br
(d) Li, Na, K

Question. Newlands could classify elements only upto–
(a) copper
(b) chlorine
(c) calcium
(d) chromium

Question. Mendeleev classified elements in
(a) increasing order of atomic groups
(b) eight periods and eight groups
(c) seven periods and nine groups
(d) eight periods and seven groups

Question. Who developed long form of the periodic table?
(a) Lothar Meyer
(b) Neils Bohr
(c) Mendeleev
(d) Moseley

Question. At present, how many elements are known
(a) 110
(b) 112
(c) 113
(d) 118

Question. Which of the scientists given below discovered that periodic table should be based on the atomic number ?
(a) Mendeleev
(b) Newlands
(c) Moseley
(d) Lothar Meyer

Question. How many elements are there in 6th period of periodic table?
(a) 18
(b) 8
(c) 30
(d) 32

Question. Select the correct chronological order for the discoveries of the following scientists. Dobereiner, Newlands, Chancourtois, Mendeleev
(a) Chancourtois, Dobereiner, Newlands, Mendeleev
(b) Dobereiner, Chancourtois, Newlands, Mendeleev
(c) Dobereiner, Newlands, Chancourtois, Mendeleev
(d) Chancourtois, Newlands, Dobereiner, Mendeleev

Question. The molecular formula of chloride of Eka-Aluminium and Eka-Silicon respectively are
(a) GaCl₃ and SiO₄
(b) GaCl₃ and AlCl₃
(c) AlCl₃ and SiCl₄
(d) GaCl₃ and GeCl₄

Question. Modern periodic table is based on the atomic number of the elements. The experiment which proved the significance ofthe atomic number was
(a) Mulliken’s oil drop experiment
(b) Mosley’s work on X-ray spectra
(c) Bragg’s work on X-ray diffraction
(d) Discovery of X-rays by Rontgen

Question. Element with which of the following atomic number was named by American Society as Rutherfordium, while by Soviet Society it was named as Kurchatovium?
(a) 108
(b) 104
(c) 114
(d) 110

Question. What is the IUPAC name of the element with atomic number 114 ?
(a) Unununnium
(b) Unnilquadium
(c) Ununquadium
(d) Unnilennium.