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Chemistry
Periodic Table & Periodicity
Previous Years Questions

MCQ (Single Correct Answer)

The transition metal having highest $3^{\text {rd }}$ ionisation enthalpy is :
Given below are two statements : Statement (I) : Both metals and non-metals exist in p and d-block elements. Statement (II) : Non-metals have higher i...
Consider the following elements. Which of the following is/are true about $$\mathrm{A}^{\prime}, \mathrm{B}^{\prime}, \mathrm{C}^{\prime}$$ and $$\ma...
The correct sequence of electron gain enthalpy of the elements listed below is A. Ar B. Br C. F D. S Choose the most appropriate from the options give...
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R: Assertion A: $$\mathrm{H}_2 \mathrm{Te}$$ is mor...
Given below are two statements: Statement - I: Along the period, the chemical reactivity of the elements gradually increases from group 1 to group 18 ...
Match List I with List II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-famil...
Given below are two statements: Statement I : Fluorine has most negative electron gain enthalpy in its group. Statement II : Oxygen has least negative...
The element having the highest first ionization enthalpy is
Anomalous behavior of oxygen is due to its
Given below are two statements : one is labelled as Assertion $$\mathbf{A}$$ and the other is labelled as Reason $$\mathbf{R}$$ : Assertion A : The fi...
Given below are two statements : Statement I : The electronegativity of group 14 elements from $$\mathrm{Si}$$ to $$\mathrm{Pb}$$, gradually decreases...
Element not showing variable oxidation state is :
Given below are two statements : Statement (I) : The $$4 \mathrm{f}$$ and $$5 \mathrm{f}$$ - series of elements are placed separately in the Periodic ...
Which of the following statements are not correct? A. The electron gain enthalpy of $$\mathrm{F}$$ is more negative than that of $$\mathrm{Cl}$$. B. I...
For elements $$\mathrm{B}, \mathrm{C}, \mathrm{N}, \mathrm{Li}, \mathrm{Be}, \mathrm{O}$$ and $$\mathrm{F}$$, the correct order of first ionization en...
Given below are two statements: one is labelled as Assertion $$\mathbf{A}$$ and the other is labelled as Reason $$\mathbf{R}$$ Assertion A : The energ...
The correct order of electronegativity for given elements is:
Which one of the following elements will remain as liquid inside pure boiling water?
Group-13 elements react with $$\mathrm{O}_{2}$$ in amorphous form to form oxides of type $$\mathrm{M}_{2} \mathrm{O}_{3}~(\mathrm{M}=$$ element). Whic...
The difference between electron gain enthalpies will be maximum between :
Which of the following elements have half-filled f-orbitals in their ground state? (Given : atomic number $\mathrm{Sm}=62 ; \mathrm{Eu}=63 ; \mathrm{...
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R) Assertion (A): The first ionization enthalp...
The correct increasing order of the ionic radii is
Bond dissociation energy of "E-H" bond of the "$\mathrm{H}_{2} \mathrm{E}$ " hydrides of group 16 elements (given below), follows order. A. $\mathrm{O...
Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family...
Given below are two statements : Statement I : The decrease in first ionization enthalpy from B to Al is much larger than that from Al to Ga. Statemen...
Inert gases have positive electron gain enthalpy. Its correct order is :
The first ionization enthalpy of Na, Mg and Si, respectively, are : 496, 737 and $$786 \mathrm{~kJ} \mathrm{~mol}^{-1}$$. The first ionization enthalp...
In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical? (A) Rb and Cs (B) Na and K (C) Ar ...
The incorrect statement is
Given two statements below : Statement I : In $$\mathrm{Cl}_{2}$$ molecule the covalent radius is double of the atomic radius of chlorine. Statement I...
The first ionization enthalpies of Be, B, N and O follow the order
The IUPAC nomenclature of an element with electronic configuration [Rn] $$5 \mathrm{f}^{14} 6 \mathrm{d}^{1} 7 \mathrm{s}^{2}$$ is :
The correct order of electron gain enthalpy ($$-$$ ve value) is :
Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The first ionization enthalpy for ...
Match List - I with List - II : .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-...
Among the following, basic oxide is :
Element "E" belongs to the period 4 and group 16 of the periodic table. The valence shell electron configuration of the element, which is just above "...
The correct order of increasing ionic radii is
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : The ionic radii of O2$$-$$ ...
The correct order of electron gain enthalpies of Cl, F, Te and Po is
Given below are the oxides: Na2O, As2O3, N2O, NO and Cl2O7 Number of amphoteric oxides is :...
Match List - I with List - II : List - I(Metal Ion) List - II(Group of Qualitative analysis) (a) $$M{n^{2 + }}$$...
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) : Metallic character decreases...
The correct order of ionic radii for the ions, P3$$-$$, S2$$-$$, Ca2+, K+, Cl$$-$$ is :
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) : Barium carbonate is insolubl...
The correct order of first ionisation enthalpy is :
Match List - I with List - II : List - I List - II (a) NaOH (i) Acidic (b) $$Be{(OH)_2}$$ ...
The ionic radii of F$$-$$ and O2$$-$$ respectively are 1.33$$\mathop A\limits^o $$ and 1.4$$\mathop A\limits^o $$, while the covalent radius of N is 0...
The ionic radii of K+, Na+, Al3+ and Mg2+ are in the order:
Which one of the following statements for D.I. Mendeleeff, is incorrect?
The first ionization energy of magnesium is smaller as compared to that of elements X and Y, but higher than that of Z. The elements X, Y and Z, respe...
The absolute value of the electron gain enthalpy of halogens satisfies :
The characteristics of elements X, Y and Z with atomic numbers, respectively, 33, 53 and 83 are :
Identify the elements X and Y using the ionisation energy values given below : Ionization energy (kJ/mol) 1$${st}$$...
Which pair of oxides is acidic in nature?
The correct order of electron gain enthalpy is :
Match List - I with List - II. List I Electronic configuration List II $${\Delta _i}H$$ in kJ $$mo{l^{ - 1}}$$ (a) ...
The correct order of bond dissociation enthalpy of halogens is :
Consider the elements Mg, Al, S, P and Si, the correct increasing order of their first ionization enthalpy is :
The correct order of the ionic radii of O2–, N3–, F– , Mg2+, Na+ and Al3+ is :
The ionic radii of O2–, F–, Na+ and Mg2+ are in the order :
Among the statements (I – IV), the correct ones are: (I) Be has smaller atomic radius compared to Mg. (II) Be has higher ionization enthalpy than Al. ...
The five successive ionization enthalpies of an element are 800, 2427, 3658, 25024 and 32824 kJ mol–1. The number of valence electrons in the element ...
The atomic number of the element unnilennium is :
Three elements X, Y and Z are in the 3rd period of the periodic table. The oxides of X, Y and Z, respectively, are basic, amphoteric and acidic. The c...
In general the property (magnitudes only) that show an opposite trend in comparison to other properties across a period is
The first and second ionisation enthalpies of a metal are 496 and 4560 kJ mol–1, respectively. How many moles of HCl and H2SO4, respectively, will be ...
B has a smaller first ionization enthalpy than Be. Consider the following statements : (I) It is easier to remove 2p electron than 2s electron (II) 2p...
The acidic, basic and amphoteric oxides, respectively, are :
The electronic configurations of bivalent europium and trivalent cerium are (atomic number : Xe = 54, Ce = 58, Eu = 63)
The increasing order of the atomic radii of the following elements is :- (a) C (b) O (c) F (d) Cl (e) Br
The third ionization enthalpy is minimum for :
The first ionization energy (in kJ/mol) of Na, Mg, Al and Si respectively, are :
Within each pair of elements F & Cl, S & Se, and Li & Na, respectively, the elements that release more energy upon and electron gain are :
The electron gain enthalpy (in KJ/mol) of fluorine, chlorine, bromine and iodine, respectively are:
Among the following, the energy of 2s orbital is lowest in :
In comparison to boron, berylium has :
The element having greatest difference between its first and second ionization energies, is :
The IUPAC symbol for the element with atomic number 119 would be :
The lathanide ion that would show colour is :
The size of the iso-electronic species Cl–,  Ar and Ca2+ is affected by :
The element with Z = 120 (not yet discovered) will be an/a -
The correct option with respect to the Pauling electronegativity values of the element is :
The correct order of the atomic radii of C, Cs, Al, and S is :
The electronegativity of aluminium is similar to :
When the first electron gain enthalpy $$\left( {{\Delta _{eg}}H} \right)$$ of oxygen is $$-$$ 141 kJ/mol, its second electron gain enthalpy is :
In general, the properties that decrease and increase down a group in the periodic table, respectively, are :
Aluminium is usually found in +3 oxidation state. In contrast, thallium exists in + 1 and + 3 oxidation states. This is due to :
The correct order of electron affinity is :
For Na+, Mg2+, F- and O2-; the correct order of increasing ionic radii is :
The electronic configuration with the highest ionization enthalpy is :
Which one of the following is an oxide?
Consider the following ionization enthalpies of two elements 'A' and 'B' . .tg {border-collapse:collapse;border-spacing:0;} .tg td{font-family:Arial...
The following statements concern elements in the periodic table. Which of the following is true ?
The ionic radii (in Å) of N3–, O2– and F– are respectively:
Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar?
The first ionization potential of Na is 5.1 eV. The value of electron gain enthalpy of Na+ will be:
The increasing order of the ionic radii of the given isoelectronic species is :
Which one of the following order represents the correct sequence of the increasing basic nature of the given oxides ?
Outer electronic configuration of Gd (Atomic no : 64) is -
The correct sequence which shows decreasing order of the ionic radii of the elements is
In which of the following arrangements, the sequence is not strictly according to the property written against it
The set representing the correct order of ionic radius is :
Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements g...
The increasing order of the first ionization enthalpies of the elements B, P, S and F (lowest first) is :
Which of the following oxides is amphoteric in character?
In which of the following arrangements the order is NOT according to the property indicated against it?
Which one of the following ions has the highest value of ionic radius?
Among Al2O3, SiO2, P2O3 and SO2 the correct order of acid strength is
The formation of the oxide ion O2-(g) requires first an exothermic and then an endothermic step as shown below O(g) + e- = $$O_{(g)}^{-}$$ $$\Delta $...
According to the Periodic Law of elements, the variation in properties of elements is related to their
Which one of the following is an amphoteric oxide?
The reduction in atomic size with increase in atomic number is a characteristic of elements of
The atomic numbers of Vanadium (V), Chromium (cr), Manganese (Mn) and Iron (Fe), respectively, $$23,24,25$$ and $$26$$. Which one of these may be expe...
The correct order of ionic radius is
$$C{e^{ + 3}},\,\,L{a^{ + 3}},\,\,P{m^{ + 3}}\,\,$$ and $$Y{b^{ + 3}}\,\,$$ have ionic radial in the increasing order as

Numerical

If IUPAC name of an element is "Unununnium" then the element belongs to nth group of Periodic table. The value of n is ________.
Total number of acidic oxides among $$\mathrm{N_2O_3,NO_2,N_2O,Cl_2O_7,SO_2,CO,CaO,Na_2O}$$ and $$\mathrm{NO}$$ is ____________.
Number of amphoteric compounds among the following is ________. (A) BeO (B) BaO (C) Be(OH)2 (D) Sr(OH)2
The atomic number of Unnilunium is _______.
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