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Classification of Elements and Periodicity in Properties — NEET UG Chemistry PYQs

562 previous year questions from Classification of Elements and Periodicity in Properties with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

562 questionsChemistrySolutions on every page
1

Match the following List I List II A. Technetium I. Non-metal B. Fluorine II. Transition metal C. Tellurium III. Lanthanoid D. Dysprosium IV. Metalloid

MHT CET Medical 2026 Solution View → 2

Which of the following properties increases from fluorine to iodine in group?

MHT CET Medical 2026 Solution View → 3

Identify the metalloid element from the following.

MHT CET Medical 2026 Solution View → 4

Which among the following elements does NOT exhibit -2 oxidation state?

MHT CET Medical 2026 Solution View → 5

Which has the maximum electropositive character?

MHT CET Medical 2026 Solution View → 6

The hydride with lowest acid strength among the following is

MHT CET Medical 2026 Solution View → 7

Among the following options, the correct trend in the electron gain enthalpy is

NEET 2026 Solution View → 8

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 of O is lower than that of N and

NEET 2026 Solution View → 9

Identify the incorrect statement from the following :

NEET 2026 Solution View → 10

The correct order of increasing metallic character of Na, Be, P, Mg and Si is :

NEET 2026 Solution View → 11

The correct statement is

NEET 2026 Solution View → 12

Which of the following statements are true? A. Unlike Ga that has a very high melting point, Cs has a very low melting point. B. On Pauling scale, the electronegativity values of N

NEET 2025 Solution View → 13

Which among the following electronic configurations belong to main group elements? A. [ Ne ] 3 ~s ^1 B. [ Ar ] 3 ~d ^3 4 ~s ^2 C. [ Kr ] 4 d¹⁰ 5 s^2 5 p^5 D. [ Ar ] 3 ~d ¹⁰ 4 ~s ^1

NEET 2025 Solution View → 14

Match List-I with List-II : Identify the correct answer from the options given below:

NEET 2024 Solution View → 15

Arrange the following elements in increasing order of first ionization enthalpy: Li , Be , B , C , N Choose the correct answer from the options given below:

NEET 2024 Solution View → 16

Match List-I with List-II: Choose the correct answer from the options given below:

NEET 2024 Solution View → 17

Arrange the following elements in increasing order of electronegativity: N , O , F , C , Si Choose the correct answer from the options given below:

NEET 2024 Solution View → 18

The correct decreasing order of atomic radii ( pm ) of Li , Be , B and C is

NEET 2024 Solution View → 19

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Ionisation enthalpy increases along each series of the tr

NEET 2023 Solution View → 20

The correct sequence given below containing neutral, acidic, basic and amphoteric oxide each, respectively, is

NEET 2023 Solution View → 21

Taking stability as the factor, which one of the following represent the correct relationship?

NEET 2023 Solution View → 22

If first ionization enthalpies of element X and Y are 419 ~kJ ~mol ⁻¹ and 590 ~kJ ~mol ⁻¹ , respectively and second ionization enthalpies of X and Y are 3069 kJ mol ⁻¹ and 1145 ~kJ

NEET 2022 Solution View → 23

The correct order of first ionization enthalpy for the given four element is :

NEET 2022 Solution View → 24

The IUPAC name of an element with atomic number 119 is

NEET 2022 Solution View → 25

Match the element in column I with that in column II. Column-I Column-II (a) Copper (p) Non-metal (b) Fluorine (q) Transition metal (c) Silicon (r) Lanthanoid (d) Cerium (s) Metall

NEET 2020 Solution View → 26

Identify the incorrect match. Name IUPAC Official Name (a) Unnilunium (i) Mendelevium (b) Unniltrium (ii) Lawrencium (c) Unnilhexium (iii) Seaborgium (d) Unununium (iv) Darmstadtiu

NEET 2020 Solution View → 27

Match the following : Oxide Nature (a) CO (i) Basic (b) BaO (ii) Neutral (c) Al 2 O 3 (iii) Acidic (d) Cl 2 O 7 (iv) Amphoteric Which of the following is correct option?

NEET 2020 Solution View → 28

Assertion: The electron gain enthalpy of N is +ve while that of P is -ve. Reason : This is due to the smaller atomic size of N in which there is a considerable electronelectron rep

AIIMS 2019 Solution View → 29

Which has least covalent radius?

AIIMS 2019 Solution View → 30

The correct order of decreasing first ionisation energy is

AIIMS 2019 Solution View → 31

Which pair of elements has maximum electronegativity difference?

AIIMS 2019 Solution View → 32

Assertion : Bond energy of F ₂ is lesser than Cl ₂ . Reason : F-atom is smaller in size than Cl .

AIIMS 2019 Solution View → 33

Match the oxide given in column A with its property given in column B. Which of the following options has all correct pairs?

NEET 2019 Solution View → 34

For the second period elements the correct increasing order of first ionization enthalpy is:

NEET 2019 Solution View → 35

Valence electrons in the element X are 3 and that in element Y is 6. Most probable compound formed from X and Y is

JIPMER 2018 Solution View → 36

Which of the following pair behaves as strong and weak base hydride repectively NH ₃, PH ₃, AsH ₃, SbH ₃, BiH ₃

JIPMER 2018 Solution View → 37

The correct order of atomic radii in group 13 elements is

NEET 2018 Solution View → 38

Which of the following oxide is most acidic?

JIPMER 2017 Solution View → 39

The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration?

NEET 2017 Solution View → 40

An element (X) belongs to fourth period and fifteenth group of the periodic table. Which one of the following is true regarding the outer electronic configuration of (X) ? It has

AIIMS 2016 Solution View → 41

The magnitude of screening effect depends upon the number of

JIPMER 2016 Solution View → 42

Highest energy will be absorbed to eject out the electron in the configuration.

JIPMER 2016 Solution View → 43

In which of the following options the order of arrangement does not agree with the variation of property indicated against it?

NEET 2016 Solution View → 44

Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

NEET 2016 Solution View → 45

Which of the following elements will have the highest electron affinity?

AIIMS 2015 Solution View → 46

The formation of the oxide ion, O 2 - ( g ) , from oxygen atom requires first an exothermic and then an endothermic step as shown in below: O g + e - ⟶ O - g     &

NEET 2015 Solution View → 47

The species A r ,   K + and C a 2 +   contain the same number of electrons. In which order do their radii increase?

NEET 2015 Solution View → 48

Which is correct regarding size of atom?

AIIMS 2014 Solution View → 49

Which of the following orders of ionic radii is correctly represented?

NEET 2014 Solution View → 50

The first ionisation enthalpy of Na , Mg and Si are 496,737,776 ~kJ / mol respectively. What will be the first ionisation enthalpy potential of Al in kJ / mol ?

AIIMS 2013 Solution View → 51

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 ?

NEET 2013 Solution View → 52

Identify the correct order of solubility in aqueous medium.

NEET 2013 Solution View → 53

Assertion : H ₂ Se is less acidic than H ₂ ~S . Reason : S is less electronegative than Se.

AIIMS 2012 Solution View → 54

Difference in atomic radius is maximum for

AIIMS 2012 Solution View → 55

The most basic element is

JIPMER 2012 Solution View → 56

Assertion : R₃ P = O exists but R₃ ~N = O does not exist. Reason : P is more electronegative than N .

AIIMS 2011 Solution View → 57

Assertion : H ₂ ~S is less acidic than H ₂ Te . Reason : Te has larger radius than S .

AIIMS 2011 Solution View → 58

What is the value of electron gain enthalpy of Na ⁺ if IE ₁ of Na =5.1 eV ?

NEET 2011 Solution View → 59

Which of the following oxide is amphoteric?

NEET 2011 Solution View → 60

Which of the following is correct?

AIIMS 2010 Solution View → 61

Which of the following sequence contains atomic number of only representative elements?

AIIMS 2010 Solution View → 62

Which of the following relation is correct ?

JIPMER 2010 Solution View → 63

In long form of Periodic Table, the properties of the elements are a periodic function of their

JIPMER 2010 Solution View → 64

Which of the following is a wrong statement? In a given period of the Periodic Table, the s -block element has, in general, a higher value of

JIPMER 2010 Solution View → 65

Among the elements Ca , Mg , P and Cl , the order of increasing atomic radii is

NEET 2010 Solution View → 66

Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O , S , F and Cl ?

NEET 2010 Solution View → 67

Amongst the elements with following electronic configurations, which one of them may have the highest ionisation energy ?

NEET 2009 Solution View → 68

The stability of +1 oxidation state increases in the sequence

NEET 2009 Solution View → 69

Which of the following molecules acts as a Lewis acid ?

NEET 2009 Solution View → 70

The stability of +1 oxidation state increases in the sequence :

NEET 2009 Solution View → 71

The set representing the correct order for first ionisation potential is

JIPMER 2008 Solution View → 72

The correct order of decreasing second ionisation enthalpy of Ti(22), V (23), Cr (24) and Mn (25) is

NEET 2008 Solution View → 73

The correct order of decreasing second ionisation enthalpy of Ti (22), V (23), Cr (24) and Mn (25) is

NEET 2008 Solution View → 74

What is the correct relationship between the pHs of isomolar solutions of sodium oxide ( pH ₁ ) , sodium sulphide ( pH ₂ ) , sodium selenide ( pH ₃ ) and sodium telluride ( pH ₄ )

JIPMER 2007 Solution View → 75

With which of the following electronic configuration an atom has the lowest ionisation enthalpy?

NEET 2007 Solution View → 76

Which of the following ionic species has the greatest proton affinity to form stable compound?

NEET 2007 Solution View → 77

Identify the correct order of the size of the following:

NEET 2007 Solution View → 78

Assertion : E^ for Mn ³⁺ / Mn ²⁺ is more positive than Cr ³⁺ / Cr ²⁺ . Reason : The third ionization energy of Mn is larger than that of Cr .

AIIMS 2006 Solution View → 79

Which of the following have highest electron affinity ?

JIPMER 2006 Solution View → 80

Assertion : First ionization energy for nitrogen is lower than oxygen. Reason : Across a period effective nuclear charge decreases.

AIIMS 2005 Solution View → 81

H -bond is strongest in

JIPMER 2005 Solution View → 82

Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species?

NEET 2005 Solution View → 83

Four successive members of the first two transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy

NEET 2005 Solution View → 84

For electron affinity of halogens which of the following is correct?

AIIMS 2004 Solution View → 85

Which of the following order of ionisation energy is correct?

JIPMER 2004 Solution View → 86

The enthalpies of all elements in their standard states are

JIPMER 2004 Solution View → 87

Assertion : Dinegative anion of oxygen ( O ²⁻ ) is quite common but dinegative anion of sulphur ( S ²⁻ ) is less common. Reason : Covalency of oxygen is two.

AIIMS 2002 Solution View → 88

An atom has electronic configuration 1 s^22 p^6 3 s^2 3 p^6 3 d^3 4 s^2 , in which group it will be placed?

NEET 2002 Solution View → 89

Which of the following order is wrong?

NEET 2002 Solution View → 90

Which of the following statement is true?

NEET 2002 Solution View → 91

What is the seventh period (n = 7) known for?

NEET Solution View → 92

What are the p-Block Elements together with s-Block elements called?

NEET Solution View → 93

What did Mendeleev do when some elements did not fit his scheme of classification based on atomic weights?

NEET Solution View → 94

What term is used to describe the elements that come after uranium?

NEET Solution View → 95

How many blocks can the elements be classified into based on the type of atomic orbitals being filled with electrons?

NEET Solution View → 96

What does the period number in the Periodic Table correspond to?

NEET Solution View → 97

Why does boron (Z = 5) have a smaller first ionization enthalpy than beryllium (Z = 4)?

NEET Solution View → 98

Which group of elements is described as good conductors of heat and electricity?

NEET Solution View → 99

How many electrons does oxygen share with fluorine atoms in the OF 2 molecule?

NEET Solution View → 100

According to Newlands's Law of Octaves, what was the pattern of properties among elements?

NEET Solution View → 101

What is the atomic number equal to in a neutral atom?

NEET Solution View → 102

How many elements are there in the fourth period (n = 4) of the Periodic Table?

NEET Solution View → 103

What term is used to describe the elements in Group 18 of the Periodic Table?

NEET Solution View → 104

What are elements with properties that are characteristic of both metals and non-metals called?

NEET Solution View → 105

What type of oxide is formed by elements in the center of a period?

NEET Solution View → 106

Which type of elements are "elements towards the middle of the table"?

NEET Solution View → 107

What does the Periodic Law state?

NEET Solution View → 108

What determines the placement of elements in the s-Block of the Periodic Table?

NEET Solution View → 109

What factor causes the increase in ionization enthalpy as you move across a period in the periodic table?

NEET Solution View → 110

What is a common characteristic of Group 1 (alkali metals) and Group 2 (alkaline earth metals) in terms of ion formation?

NEET Solution View → 111

What did the Periodic Law reveal about the naturally occurring elements?

NEET Solution View → 112

Up to which element did Newlands's Law of Octaves seem to be true?

NEET Solution View → 113

How many Periods are there in the Periodic Table?

NEET Solution View → 114

Which element can only form BF 4 in terms of covalency?

NEET Solution View → 115

What term did Dobereiner use to describe the groups of three elements with similar properties?

NEET Solution View → 116

What is the trend in atomic radii change among transition metals (3d series) compared to representative elements?

NEET Solution View → 117

Which type of oxides are formed by elements on the extreme left and extreme right of a period?

NEET Solution View → 118

Which element has the valence shell electronic configuration [Ne]3s1?

NEET Solution View → 119

Who was the first scientist to consider the idea of trends among properties of elements?

NEET Solution View → 120

Why is helium positioned in the p-block of the Periodic Table?

NEET Solution View →
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