jee main chemistry important questions | Classification Of Elements And Periodicity In Properties

Q 1 :

Given below are two statements:

Statement - I : Along the period, the chemical reactivity of the elements gradually increases from group 1 to group 18.

Statement - II : The nature of oxides formed by group 1 elements is basic while that of group 17 elements is acidic.

In the light of the above statements, choose the most appropriate from the options given below: [2024]

Both Statement I and Statement II are True
Statement I is True but Statement II is False
Statement I is False but statement II is true
Both Statement I and Statement II are False

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(3)

Statement (I): Chemical reactivity decreases across a period from left to right. Group 18 elements are inert.

Statement (II): Metals (group 1 elements) form basic oxides (dissolve in water to form base) e.g. ${Li}_{2} O, {Na}_{2} O$ etc. Non metals (group 17 elements) form acidic oxides (dissolve in water to form acids) e.g. ${Cl}_{2} O_{7}, I_{2} O_{5}$ , etc.

Q 2 :

Arrange the bonds in order of increasing ionic character in the molecules. $LiF, K_{2} O, N_{2}, {SO}_{2}$ and ${CIF}_{3}$ . [2024]

${ClF}_{3} < N_{2} < {SO}_{2} < K_{2} O < LiF$
$LiF < K_{2} O < {ClF}_{3} < {SO}_{2} < N_{2}$
$N_{2} < {SO}_{2} < {ClF}_{3} < K_{2} O < LiF$
$N_{2} < {ClF}_{3} < {SO}_{2} < K_{2} O < LiF$

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(3)

More is electronegativity difference between atoms more will be the ionic character of the molecule. So, the order of increasing ionic character in the given molecules is $N_{2} < {SO}_{2} < {ClF}_{3} < K_{2} O < LiF .$

Q 3 :

Match List I with List II

List-I List-II

(Elements) (Properties in their respective groups)

A. Cl, S I. Elements with highest electronegativity

B. Ge, As II. Elements with largest atomic size

C. Fr, Ra III. Elements which show properties of both metals and non-metal

D. F, O IV. Elements with highest negative electron gain enthalpy

Choose the correct answer from the options given below : [2024]

A-IV, B-III, C-II, D-I
A-III, B-II, C-I, D-IV
A-II, B-I, C-IV, D-III
A-II, B-III, C-IV, D-I

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(1)

(A)

Group	Electron gain enthalpy becomes less negative in the order
16	$S > Se > Te > Po > O$
17	$Cl > F > Br > I$

(B) Ge and As are metalloids

(C)

Group	Atomic radius increases down the group
1	$H < Li < Na < K < Rb < Cs < Fr$
2	$Be < Mg < Ca < Sr < Ba < Ra$

(D) Order of electronegativity values for few elements in periodic table is:

$F > O > N = Cl > Br > I = S = C > P = H$

Q 4 :

Identify the correct statements about p-block elements and their compounds.

(A) Non metals have higher electronegativity than metals.

(B) Non metals have lower ionisation enthalpy than metals.

(C) Compounds formed between highly reactive non metals and highly reactive metals are generally ionic.

(D) The non metal oxides are generally basic in nature.

(E) The metal oxides are generally acidic or neutral in nature.

Choose the correct answer from the options given below: [2024]

(D) and (E) only
(B) and (E) only
(B) and (D) only
(A) and (C) only

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(4)

Non metals are more electronegative than metals. Non metal oxides (such as ${SO}_{3}$ , ${CO}_{2}$ etc) are acidic and metal oxides (such as ${Na}_{2} O$ , CaO etc ) are basic. Compounds formed between highly electronegative (non metals) and highly electropositive (metals) elements are ionic (such as $NaCl$ ).

Q 5 :

Match List-I with List-II. [2025]

List-I List-II

A. ${Al}^{3 +} < {Mg}^{2 +} < {Na}^{+} < F^{-}$ I. Ionisation Enthalpy

B. $B < C < O < N$ II. Metallic character

C. $B < Al < Mg < K$ III. Electronegativity

D. $Si < P < S < Cl$ IV. Ionic radii

Choose the correct answer from the options given below:

A-IV, B-I, C-III, D-II
A-III, B-IV, C-II, D-I
A-II, B-III, C-IV, D-I
A-IV, B-I, C-II, D-III

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(4)

(A) For isoelectronic species radius $\propto \frac{1}{Z}$

(B) In a period, ionization enthalpy increases from left to right because of increase in $Z_{eff}$ . But ionization enthalpy of group 15 elements is more than that of group 16 elements in respective periods. This is because stable half filled configuration of group 15 elements makes removal of an electron difficult.

(C)

(D)

Q 6 :

Which of the following electronegativity order is incorrect? [2025]

S < Cl < O < F
Al < Mg < B < N
Al < Si < C < N
Mg < Be < B < N

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(2)

Correct order of electronegativity is : Mg < Al < B < N.

Q 7 :

Electronic configuration of four elements A, B, C and D are given below : [2025]

(A)   $1 s^{2} 2 s^{2} 2 p^{3}$
(B)   $1 s^{2} 2 s^{2} 2 p^{4}$
(C)   $1 s^{2} 2 s^{2} 2 p^{5}$
(D)   $1 s^{2} 2 s^{2} 2 p^{2}$

Which of the following is the correct order of increasing electronegativity (Pauling’s scale)?

A < D < B < C
A < C < B < D
A < B < C < D
D < A < B < C

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(4)

$\to_{Electronegativity increases from left to right in a period.}^{\begin{matrix} (D) & (A) & (B) & (C) \\ 1 s^{2} 2 s^{2} 2 p^{2} & 1 s^{2} 2 s^{2} 2 p^{3} & 1 s^{2} 2 s^{2} 2 p^{4} & 1 s^{2} 2 s^{2} 2 p^{5} \\ Carbon & Nitrogen & Oxygen & Fluorine \end{matrix}}$

Q 8 :

Which of the following statements are correct? [2025]

A. The process of adding an electron to a neutral gaseous atom is always exothermic.

B. The process of removing an electron from an isolated gaseous atom is always endothermic.

C. The 1st ionization energy of boron is less than that of beryllium.

D. The electronegativity of C is 2.5 in ${CH}_{4}$ and ${CCl}_{4}$ .

E. Li is the most electropositive among elements of group $I$ .

Choose the correct answer from the options given below:

B and C only
A, C and D only
B and D only
B, C and E only

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(A) For noble gases, N, Be and Mg electron affinity is negative i.e. energy is absorbed when an electron is added to an isolated neutral atom.

(C) It is slightly more difficult to remove an electron from fully filled $2 s^{2}$ orbital of Be $(1 s^{2} 2 s^{2})$ than from $2 p^{1}$ orbital of B $(1 s^{2} 2 s^{2} 2 p^{1})$ . Thus first ionization energy of B is less than that of Be.

(D) Four Cl atoms increase the partial positive charge on C hence increase its electronegativity. Thus electronegativity of C in ${CCl}_{4} > {CH}_{4}$ .

(E) Cs is most electropositive element of group 1.

Q 9 :

Given below are two statements : [2025]

Statement I: An element in the extreme left of the periodic table forms acidic oxides.

Statement II: Acid is formed during the reaction between water and oxide of a reactive element present in the extreme right of the periodic table.

In the light of the above statements, choose the correct answer from the options given below :

Both Statement I and Statement II are false
Both Statement I and Statement II are true
Statement I is true but Statement II is false
Statement I is false but Statement II is true

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(4)

Extreme left side of periodic table ( $s$ -block) has metals which form basic oxides. Acidic oxides (i.e.oxides which form acid upon reaction with water, e.g. ${CO}_{2} + H_{2} O \to H_{2} {CO}_{3}$ ) are formed by non-metals. Non-metals occupy extreme right side of periodic table.

Q 10 :

Which of the following represents the correct order of metallic character of the given elements? [2023]

Be < Si < Mg < K
K < Mg < Be < Si
Be < Si < K < Mg
Si < Be < Mg < K

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(4)

According to electropositive character Si is having non metallic character.

Q 11 :

The correct order of basicity of oxides of vanadium is [2023]

$V_{2} O_{3} > V_{2} O_{5} > V_{2} O_{4}$
$V_{2} O_{4} > V_{2} O_{3} > V_{2} O_{5}$
$V_{2} O_{3} > V_{2} O_{4} > V_{2} O_{5}$
$V_{2} O_{5} > V_{2} O_{4} > V_{2} O_{3}$

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(3)

Basic strength of oxides $\propto \frac{1}{O.N.}$

$\begin{matrix} Oxide & V_{2} O_{3} & V_{2} O_{4} & V_{2} O_{5} \\ O.N. & + 3 & + 4 & + 5 \end{matrix}$

$\begin{matrix} Basic strength: & V_{2} O_{5} & < & V_{2} O_{4} & < & V_{2} O_{3} \\ Acidic & Amphoteric & Less basic \end{matrix}$

Q 12 :

The correct order of electronegativity for given elements is: [2023]

Br > C > At > P
P > Br > C > At
C > P > At > Br
Br > P > At > C

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(1)

Element	C	P	Br	At
Electronegativity	2.5	2.1	2.9	2.2

Q 13 :

The correct order of metallic character is: [2023]

Ca > K > Be
Be > Ca > K
K > Be > Ca
K > Ca > Be

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(4)

Q 14 :

Total number of acidic oxides among $N_{2} O_{3}, {NO}_{2}, N_{2} O, {Cl}_{2} O_{7}, {SO}_{2}, CO, CaO, {Na}_{2} O, and NO$ is_______ . [2023]

(4)

Acidic oxides	Basic oxides	Neutral oxides
$N_{2} O_{3}$	$N a_{2} O$	$N_{2} O$
$N O_{2}$	$CaO$	$NO$
$C l_{2} O_{7}$
$S O_{2}$

Q 15 :

Consider the elements N, P, O, S, Cl and F. The number of valence electrons present in the elements with most and least metallic character from the above list is respectively. [2026]

6 and 7
7 and 5
5 and 6
5 and 7

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(4)

Least metallic = F, valence electrons = 7

Most metallic = P, valence electrons = 5

Q 16 :

Which of the following order is not correct?

${AlCl}_{3} > {MgCl}_{2} > NaCl$ [covalent character]
$B > A l > T l > In > Ga$ [melting point]
${AlCl}_{3} > {MgCl}_{2} > NaCl$ [melting point]
$C > Ge > Si > Pb > Sn$ [ $3^{r d}$ ionization enthalpy]

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(3)

${AlCl}_{3} < {MgCl}_{2} < NaCl [melting point]$

${IE}_{3} : C > Ge > Si > Pb > Sn, B > Al > Tl > In > Ga$

Q 17 :

Consider the following oxides; $N_{2} O, N O, C O, C O_{2}, N_{2} O_{5}, A l_{2} O_{3}, Z n O, V_{2} O_{5}$

If

X = number of neutral oxides,

Y = number of acidic oxides

Z = number of an amphoteric oxides

Then $[(X + Y) - (Z)]$ is _____.

(2)

X = 3, Y = 2, Z = 3

Q 18 :

The electronegativity of a group 13 element 'E' is same as that of Ge (on Pauling scale and upto one decimal point). The correct statements about $E^{3 +}$ are

A. It can act as a reducing agent.

B. It can act as an oxidizing agent.

C. $E^{3 +}$ is more stable than $E^{+}$ .

D. The standard electrode potential value of $E^{3 +} / E$ is positive.

Choose the correct answer from the options given below: [2026]

A and C only
B and C only
B and D only
A and D only

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(3)

$EN of Tl = EN of Ge = 1.8$

Due to inert pair effect ${Tl}^{+ 1}$ is more stable than ${Tl}^{+ 3}$ . Thus ${Tl}^{+ 3}$ has tendency to get converted to ${Tl}^{+ 1}$ and is an oxidising agent.

Q 19 :

Given below are two statements:

Statement I: The correct order of electronegativity of fluorine, oxygen and nitrogen is $F > O > N$ .

Statement II: The oxidation state of oxygen in ${OF}_{2}$ is +2 and in ${Na}_{2} O$ is -2.

In the light of the above statements, choose the correct answer from the options given below: [2026]

Both Statement I and Statement II are true
Both Statement I and Statement II are false
Statement I is true but Statement II is false
Statement I is false but Statement II is true

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(1)

Statement I : E.N order : $F (4) > O (3.5) > N (3.0)$ . Electronegativity increases from left to right across a period

Statement II : $\overset{+ 2}{O} \overset{- 1}{F_{2}}, \overset{+ 1}{{Na}_{2}} \overset{- 2}{O}$

Q 20 :

The correct set that contains all kinds (basic, acidic, amphoteric and neutral) of oxides is: [2026]

${Na}_{2} O, K_{2} O, {Al}_{2} O_{3} {and As}_{2} O_{3}$
${Al}_{2} O_{3}, {As}_{2} O_{3}, CO and NO$
$K_{2} O, {Cl}_{2} O_{7}, {As}_{2} O_{3} and NO$
${Na}_{2} O, N_{2} O, {Al}_{2} O_{3} and CO$

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Oxides	Nature
${Na}_{2} O, K_{2} O$	Basic
${Cl}_{2} O_{7}$	Acidic
$N_{2} O, NO, CO$	Neutral
${Al}_{2} O_{3}, {As}_{2} O_{3}$	Amphoteric

Q 21 :

Given below are two statements:

Statement I: The number of pairs among $[{Al}_{2} O_{3}, {Cr}_{2} O_{3}]$ , $[{Cl}_{2} O_{7}, {Mn}_{2} O_{7}]$ , $[{Na}_{2} O, V_{2} O_{3}]$ and $[CO, N_{2} O]$ that contain oxides of same nature (acidic, basic, neutral or amphoteric) is 4.

Statement II: Among ${Na}_{2} O, {Al}_{2} O_{3}, CO$ and ${Cl}_{2} O_{7}$ , the most basic and acidic oxides are ${Na}_{2} O$ and ${Cl}_{2} O_{7}$ , respectively.

In the light of the above statements, choose the correct answer from the options given below: [2026]

Both Statement I and Statement II are true
Both Statement I and Statement II are false
Statement I is true but Statement II is false
Statement I is false but Statement II is true

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(1)

Statement I:

Oxides	Nature
${Al}_{2} O_{3}, {Cr}_{2} O_{3}$	Amphoteric
${Cl}_{2} O_{7}, {Mn}_{2} O_{7}$	Acidic
${Na}_{2} O, V_{2} O_{3}$	Basic
$CO, N_{2} O$	Neutral

Statement II: It is correct statement.

Topic Question Set

Q 2 :

Arrange the bonds in order of increasing ionic character in the molecules. $LiF, K_{2} O, N_{2}, {SO}_{2}$ and ${CIF}_{3}$ . [2024]

Q 6 :

Which of the following electronegativity order is incorrect? [2025]

Q 10 :

Which of the following represents the correct order of metallic character of the given elements? [2023]

Q 11 :

The correct order of basicity of oxides of vanadium is [2023]

Q 12 :

The correct order of electronegativity for given elements is: [2023]

Q 13 :

The correct order of metallic character is: [2023]

Q 14 :

Total number of acidic oxides among $N_{2} O_{3}, {NO}_{2}, N_{2} O, {Cl}_{2} O_{7}, {SO}_{2}, CO, CaO, {Na}_{2} O, and NO$ is_______ . [2023]

Q 15 :

Consider the elements N, P, O, S, Cl and F. The number of valence electrons present in the elements with most and least metallic character from the above list is respectively. [2026]

Q 16 :

Which of the following order is not correct?

Q 17 :

Consider the following oxides; $N_{2} O, N O, C O, C O_{2}, N_{2} O_{5}, A l_{2} O_{3}, Z n O, V_{2} O_{5}$

If

X = number of neutral oxides,

Y = number of acidic oxides

Z = number of an amphoteric oxides

Then $[(X + Y) - (Z)]$ is _____.

Q 20 :

The correct set that contains all kinds (basic, acidic, amphoteric and neutral) of oxides is: [2026]

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	List-I		List-II
	(Elements)		(Properties in their respective groups)
A.	Cl, S	I.	Elements with highest electronegativity
B.	Ge, As	II.	Elements with largest atomic size
C.	Fr, Ra	III.	Elements which show properties of both metals and non-metal
D.	F, O	IV.	Elements with highest negative electron gain enthalpy

	List-I		List-II
A.	${Al}^{3 +} < {Mg}^{2 +} < {Na}^{+} < F^{-}$	I.	Ionisation Enthalpy
B.	$B < C < O < N$	II.	Metallic character
C.	$B < Al < Mg < K$	III.	Electronegativity
D.	$Si < P < S < Cl$	IV.	Ionic radii

Topic Question Set

Q 2 : Arrange the bonds in order of increasing ionic character in the molecules. LiF,K2O,N2,SO2 and CIF3. [2024]

Q 5 : Match List-I with List-II. [2025] List-I List-II A. Al3+<Mg2+<Na+<F- I. Ionisation Enthalpy B. B<C<O<N II. Metallic character C. B<Al<Mg<K III. Electronegativity D. Si<P<S<Cl IV. Ionic radii Choose the correct answer from the options given below:

Q 6 : Which of the following electronegativity order is incorrect? [2025]

Q 7 : Electronic configuration of four elements A, B, C and D are given below : [2025] (A) 1s22s22p3 (B) 1s22s22p4 (C) 1s22s22p5 (D) 1s22s22p2 Which of the following is the correct order of increasing electronegativity (Pauling’s scale)?

Q 10 : Which of the following represents the correct order of metallic character of the given elements? [2023]

Q 11 : The correct order of basicity of oxides of vanadium is [2023]

Q 12 : The correct order of electronegativity for given elements is: [2023]

Q 13 : The correct order of metallic character is: [2023]

Q 14 : Total number of acidic oxides among N2O3,NO2,N2O,Cl2O7,SO2,CO,CaO,Na2O, and NO is_______ . [2023]

Q 15 : Consider the elements N, P, O, S, Cl and F. The number of valence electrons present in the elements with most and least metallic character from the above list is respectively. [2026]

Q 16 : Which of the following order is not correct?

Q 17 : Consider the following oxides; N2O,NO,CO,CO2,N2O5,Al2O3,ZnO,V2O5 If X = number of neutral oxides, Y = number of acidic oxides Z = number of an amphoteric oxides Then [(X+Y)-(Z)] is _____.

Q 20 : The correct set that contains all kinds (basic, acidic, amphoteric and neutral) of oxides is: [2026]

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Q 2 :

Arrange the bonds in order of increasing ionic character in the molecules. $LiF, K_{2} O, N_{2}, {SO}_{2}$ and ${CIF}_{3}$ . [2024]

Q 6 :

Which of the following electronegativity order is incorrect? [2025]

Q 10 :

Which of the following represents the correct order of metallic character of the given elements? [2023]

Q 11 :

The correct order of basicity of oxides of vanadium is [2023]

Q 12 :

The correct order of electronegativity for given elements is: [2023]

Q 13 :

The correct order of metallic character is: [2023]

Q 14 :

Total number of acidic oxides among $N_{2} O_{3}, {NO}_{2}, N_{2} O, {Cl}_{2} O_{7}, {SO}_{2}, CO, CaO, {Na}_{2} O, and NO$ is_______ . [2023]

Q 15 :

Consider the elements N, P, O, S, Cl and F. The number of valence electrons present in the elements with most and least metallic character from the above list is respectively. [2026]

Q 16 :

Which of the following order is not correct?

Q 17 :

Consider the following oxides; $N_{2} O, N O, C O, C O_{2}, N_{2} O_{5}, A l_{2} O_{3}, Z n O, V_{2} O_{5}$

If

X = number of neutral oxides,

Y = number of acidic oxides

Z = number of an amphoteric oxides

Then $[(X + Y) - (Z)]$ is _____.

Q 20 :

The correct set that contains all kinds (basic, acidic, amphoteric and neutral) of oxides is: [2026]