Q JEE MAIN 2026

In period 4 of the periodic table, the elements with highest and lowest atomic radii are respectively.

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2026

The correct order of $\mathrm{C}, \mathrm{N}, \mathrm{O}$ and F in terms of second ionisation potential is

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2026

Given below are two statements: Statement I: $\mathrm{K}>\mathrm{Mg}>\mathrm{Al}>\mathrm{B}$ is the correct order in terms of metallic character. Statement II: Atomic...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN_2026_

Consider the elements $\mathrm{N}, \mathrm{P}, \mathrm{O}, \mathrm{S}, \mathrm{Cl}$ and F . The number of valence electrons present in the elements...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2026

Given below are two statements: Statement I: The second ionisation enthalpy of Na is larger than the corresponding ionisation enthalpy...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2026

Elements X and Y belong to Group 15. The difference between the electronegativity values of ' X ' and phosphorus...

JEE Main Chemistry Medium

View Solution →

Q JEE MAIN 2026

The correct trend in the first ionization enthalpies of the elements in the $3^{\text {rd }}$ period of periodic table...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2026

Given below are two statements: Statement I: The correct order in terms of atomic/ionic radii is $\mathrm{Al}>\mathrm{Mg}>\mathrm{Mg}^{2+}>\mathrm{Al}^{3+}$. Statement II: The...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2026

Given below are two statements Statement I: $\mathrm{C}\mathrm{Po}>\mathrm{O}$ is the correct order in terms of the magnitude of electron gain...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN_2026_

Which of the following represents the correct trend for the mentioned property? A. $\mathrm{F}>\mathrm{P}>\mathrm{S}>\mathrm{B}$ - First lonization Energy B. $\mathrm{Cl}>\mathrm{F}>\mathrm{S}>\mathrm{P}$...

JEE Main Chemistry Medium

View Solution →

Q JEE MAIN 2019

The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are

JEE Main Chemistry Medium

View Solution →

Q JEE MAIN 2020

In general the property (magnitudes only) that show an opposite trend in comparison to other properties across a period is

JEE Main Chemistry Easy

View Solution →

Q JEE-MAIN 2019

The element with Z = 120 (not yet discovered) will be an/a

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2020

Three elements X, Y and Z are in the 3rd period of the periodic table. The oxides of X, Y...

JEE Main Chemistry Medium

View Solution →

Q JEE MAIN 2019

In comparison to boron, berylium has

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2019

The element having greatest difference between its first and second ionization energies, is

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2019

When the first electron gain enthalpy $\left(\Delta_{\mathrm{eg}} \mathrm{H}\right)$ of oxygen is $-141 \mathrm{~kJ} / \mathrm{mol}$, its second electron gain enthalpy...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2019

When the first electron gain enthalpy $\left(\Delta_{e 0} \mathrm{H}\right)$ of oxygen is $-141 \mathrm{~kJ} / \mathrm{mol}$, its second electron gain...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2020

The set that contains atomic numbers of only transition elements, is

JEE Main Chemistry Medium

View Solution →

Q JEE MAIN 2020

The atomic number of Unnilunium is _______.

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2020

B has a smaller first ionization enthalpy than Be. Consider the following statements. (I) It is easier to remove 2p...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2019

The element that usually does NOT show variable oxidation states is

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2019

The correct order of the atomic radii of C, Cs, Al, and S is

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2020

The first ionization energy (in kJ/mol) of Na, Mg, Al and Si respectively, are

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2020

The ionic radii of $\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}^{+}$and $\mathrm{Mg}^{2+}$ are in the order

JEE Main Chemistry Easy

View Solution →

Q JEE Main 2019

The electronegativity of aluminium is similar to

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2020

The elements with atomic numbers 101 and 104 belong to, respectively,

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2020

The process that is NOT endothermic in nature is

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2019

The relative stability of +1 oxidation state of group 13 elements follows the order :

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2019

The correct option with respect to the Pauling electronegativity values of the elements is:

JEE Main Chemistry Easy

View Solution →

Q JEE-MAIN 2020

The five successive ionization enthalpies of an element are 800, 2427, 3658, 25024 and 32824 kJ mol–1. The number of...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2020

The increasing order of the atomic radii of the following elements is (a) C (b) O (c) F (d) CI...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2020

The electron gain enthalpy (in kJ/mol) of fluorine, chlorine, bromine and iodine, respectively, are :

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2020

Oxidation number of potassium in $\mathrm{K}_2 \mathrm{O}, \mathrm{K}_2 \mathrm{O}_2$ and $\mathrm{KO}_2$, respectively, is

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2021

The number of 4f electrons in the ground state electronic configuration of Gd2+ is ________. [Atomic number of Gd =...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2020

The atomic radius of Ag is closest to

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2021

The correct order of ionic radii for the ions, $\mathrm{P}^{3-}, \mathrm{S}^{2-}, \mathrm{Ca}^{2+}, \mathrm{K}^{+}, \mathrm{Cl}^{-}$is

JEE Main Chemistry Easy

View Solution →

Q JEE-MAIN 2021

Chalcogen group elements are :

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2021

Identify the element for which electronic configuration in +3 oxidation state is $[\mathrm{Ar}] 3 \mathrm{~d}^5$ :

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2021

Identify the element for which electronic configuration in +3 oxidation state is $[\mathrm{Ar}] 3 \mathrm{~d}^5:$

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2021

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R)....

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2021

Which one of the following lanthanides exhibits +2 oxidation state with diamagnetic nature ? $($ Given Z for $...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2021

Number of electrons present in 4 f orbital of $\mathrm{Ho}^{3+}$ ion is $\_\_\_\_$ (Given Atomic No. of $\mathrm{Ho}=67$ )

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2021

The spin only magnetic moments (in BM ) for free $\mathrm{Ti}^{3+}, \mathrm{V}^{2+}$ and $\mathrm{Sc}^{3+}$ ions respectively are (At.No. Sc :...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2021

The ionic radii of $\mathrm{F}^{-}$and $\mathrm{O}^{2-}$ respectively are $1.33 \AA$ and $1.4 \AA$, while the covalent radius of N is...

JEE Main Chemistry Easy

View Solution →

Q _JEE MAIN_2021

The CORRECT order of first ionisation enthalpy is :

JEE Main Chemistry Medium

View Solution →

Q JEE MAIN 2021

The correct order of following 3d metal oxides, according to their oxidation numbers is : (a) $\mathrm{CrO}_3$ (b) $\mathrm{Fe}_2 \mathrm{O}_3$...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2021

Which one of the following statements for D.I. Mendeleeff, is incorrect?

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2021

The ionic radii of $\mathrm{K}^{+}, \mathrm{Na}^{+}, \mathrm{Al}^{3+}$ and $\mathrm{Mg2}^{+}$are in the order :

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2021

Outermost electronic configuration of a group 13 element, E , is $4 \mathrm{~s}^2, 4 \mathrm{p}^1$. The electronic configuration of an...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2019

The IUPAC symbol for the element with atomic number 119 would be :

JEE Main Chemistry Easy

View Solution →

Q JEE-MAIN 2021

The common positive oxidation states for an element with atomic number 24, are :

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2021

The first ionization energy of magnesium is smaller as compared to that of elements X and Y, but higher than...

JEE Main Chemistry Easy

View Solution →

Q JEE-MAIN 2921

The set of elements that differ in mutual relationship from those of the other sets is :

JEE Main Chemistry Easy

View Solution →

Q JEE Main 2019

Aluminium is usually found in +3 oxidation state. In contrast, thallium exists in +1 and +3 oxidation states. This is...

JEE Main Chemistry Easy

View Solution →

Q JEE Main 2019

The ore that contains both iron and copper is

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2021

The characteristics of elements X,Y and Z with atomic numbers, respectively, 33, 53 and 83 are :

JEE Main Chemistry Easy

View Solution →

Q JEE Main 2019

In general, the properties that decrease and increase down a group in the periodic table, respectively, are

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2021

JEE Main Chemistry Easy

View Solution →

Q JEE-Main-2021_

The absolute value of the electron gain enthalpy of halogens satisfies:

JEE Main Chemistry Medium

View Solution →

Q JEE MAIN 2021

The ionic radius of $\mathrm{Na}+$ ions is 1.02 Å.. The ionic radii (in Å. ) of $\mathrm{Mg}^{2+}$ and $\mathrm{Al}^{3+}$, respectively,...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2021

The correct order of electron gain enthalpy is

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2021

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2021

Consider the elements Mg. Al, S, P and Si, the correct increasing order of their first ionization enthalpy is :

JEE Main Chemistry Medium

View Solution →

Q JEE MAIN 2022

The incorrect statement is

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2022

The first ionization enthalpies of Be, B, N and O follow the order

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2022

In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical ? (A)...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2022

Outermost electronic configurations of four elements A, B, C, D are given below: (A) $3 \mathrm{~s}^2$ (B) $...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2022

The first ionization enthalpy of $\mathrm{Na}, \mathrm{Mg}$ and Si, respectively, are: 496,737 and $786 \mathrm{~kJ} \mathrm{~mol}^{-1}$. The first ionization enthalpy...

JEE Main Chemistry Easy

View Solution →

Q JEE-Main 2022

The IUPAC nomenclature of an element with electronic configuration $[\mathrm{Rn}] 5 \mathrm{f}^{14} 6 \mathrm{~d}^1 7 \mathrm{~s}^2$ is:

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2022

Consider the species $\mathrm{CH}_4, \mathrm{NH}_4^{+}$and $\mathrm{BH}_4^{-}$. Choose the correct option with respect to the there species:

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2022

The correct order of increasing ionic radii is

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2022

The correct order of electron gain enthalpies of Cl, F, Te and Po is

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2022

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason(R) Assertion (A):...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2022

Element "E" belongs to the period 4 and group 16 of the periodic table. The valence shell electron configuration of...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2024

Consider the following elements. Which of the following is/are true about $\mathrm{A}^{\prime}, \mathrm{B}^{\prime}, \mathrm{C}^{\prime}$ and $\mathrm{D}^{\prime}$ ? A. Order of...

JEE Main Chemistry Hard

View Solution →

Q JEE MAIN 2024

Given below are two statements : Statement (I): Both metal and non-metal exist in p and d-block elements. Statement (II):...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2024

Given below are two statements: Statement I: Fluorine has most negative electron gain enthalpy in its group. Statement II: Oxygen...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2024

The element having the highest first ionization enthalpy is

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2024

Total number of ions from the following with noble gas configuration is $...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2025

The atomic number of the element from the following with lowest $1^{\text {st }}$ ionisation enthalpy is :

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2025

Given below are two statements : Statement (I): The first ionisation enthalpy of group 14 elements is higher than the...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2023

The correct statements from the following are. (A) $\mathrm{Tl}^{3+}$ is a powerful oxidising agent (B) $\mathrm{Al}^{3+}$ does not get reduced...

JEE Main Chemistry Medium

View Solution →

Q JEE MAIN 2025

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

JEE Main Chemistry Medium

View Solution →

Q JEE MAIN 2025

The correct orders among the following are Atomic radius: $\mathrm{B}

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2023

Henry Moseley studied characteristic X-ray spectra of elements. The graph which represents his observation correctly is : (Given v =...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2023

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion...

JEE Main Chemistry Easy

View Solution →

Q JEE-Main_2023

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R)...

JEE Main Chemistry Hard

View Solution →

Q JEE MAIN 2023

For electron gain enthalpies of the elements denoted as $\Delta_{\mathrm{eq}} \mathrm{H}$, the incorrect option is:

JEE Main Chemistry Medium

View Solution →

Q JEE MAIN 2023

Which one of the following sets of ions represents a collection of isoelectronic species? (Given : Atomic Number : $...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2023

The set of correct statements is: (i) Manganese exhibits +7 oxidation state in its oxide. (ii) Ruthenium and Osmium exhibit...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2023

Given below are two statements: Statement I : The decrease in first ionization enthalpy from B to Al is much...

JEE Main Chemistry Hard

View Solution →

Q JEE MAIN 2023

Which of the following statements are not correct? A. The electron gain enthalpy of F is more negative than that...

JEE Main Chemistry Medium

View Solution →

Q JEE MAIN 2023

For elements B, C, N, Li, Be, O and F the correct order of first ionization enthalpy is

JEE Main Chemistry Medium

View Solution →

Q JEE MAIN 2023

Given below are two statement: one is labelled as Assertion A and the other is labelled as Reason R Assertion...

JEE Main Chemistry Hard

View Solution →

Q JEE MAIN 2023

The correct order of electronegativity for given elements is:

JEE Main Physics Easy

View Solution →

Q JEE MAIN 2023

The difference between electron gain enthalpies will be maximum between:

JEE Main Chemistry Medium

View Solution →

Q JEE-Main_2023

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

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2023

The correct increasing order of the ionic radii is

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2024

Lowest Oxidation number of an atom in a compound A_2 " " B is -2 . The number of an...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2024

Given below are two statements. Statement (I): The oxidation state of an element in a particular compound is the charge...

JEE Main Chemistry Medium

View Solution →

Q JEE MAINS 2024

The correct order of first ionization enthalpy values of the following elements is : (A) 0 (B) N (C) Be...

JEE Main Chemistry Easy

View Solution →

Q JEE MAINS 2024

Number of elements from the following that CANNOT form compounds with valencies which match with their respective group valencies is...

JEE Main Chemistry Medium

View Solution →

Q JEE-Main 2024

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

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2024

14. The electron affinity value are negative for : A. Be→Be^- B. N→N^- C. O→O^(2-) D. Na→Na E. Al→Al^- Choose...

JEE Main Chemistry Medium

View Solution →

Q JEE MAIN 2024

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R:...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2024

The statement(s) that are correct about the species O^(2-),F^-,Na^+and Mg^(2+). (A) All are isoelectronic (B) All have the same nuclear...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2024

if IUPAC name of an element is "Unununnium" then the element belongs to nth group of periodic table. The value...

JEE Main Chemistry Medium

View Solution →

Q JEE MAIN 2024

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R:...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2025

The nature of oxide $\left(\mathrm{TeO}_{2}\right)$ and hydride $\left(\mathrm{TeH}_{2}\right)$ formed by Te, respectively are :

JEE Main Physics Medium

View Solution →

Q JEE MAIN 2025

Electronic configuration of four elements $\mathrm{A}, \mathrm{B}, \mathrm{C}$ and D are given below : (A) $...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2024

Given below are two statements : Statement (I) : The 4f and 5f - series of elements are placed separately...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2025

The type of oxide formed by the element among $\mathrm{Li}, \mathrm{Na}, \mathrm{Be}, \mathrm{Mg}, \mathrm{B}$ and Al that has the least...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2025

Given below are two statements : Statement (I): According to the Law of Octaves, the elements were arranged in the...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2025

The amphoteric oxide among $\mathrm{V}_{2} \mathrm{O}_{3}, \mathrm{~V}_{2} \mathrm{O}_{4}$ and $\mathrm{V}_{2} \mathrm{O}_{5}$, upon reaction with alkali leads to formation of an...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2025

Which of the following statements are correct? A. The process of adding an electron to a neutral gaseous atom is...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2025

Given below are two statements : Statement (I): The first ionization energy of Pb is greater than that of Sn...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2025

The successive 5 ionisation energies of an element are $800,2427,3658,25024$ and $32824 \mathrm{~kJ} / \mathrm{mol}$, respectively. By using the above...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2025

The property/properties that show irregularity in first four elements of group-17 is/are : (A) Covalent radius (B) Electron affinity (C)...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2025

Given below are two statements : Statement (I) : The metallic radius of Al is less than that of Ga...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2025

Given below are two statements about X -ray spectra of elements : Statement (I): A plot of $\sqrt{v}$ ( $v=$...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2025

An element 'E' has the ionisation enthalpy value of $374\;{\rm{kJ}}\;{\rm{mo}}{{\rm{l}}^{ - 1}}$. 'E' reacts with elements A, B, C and...

JEE Main Chemistry Medium

View Solution →

Q JEE MAIN 2025

Given below are two statements : Statement (I) : The radii of isoelectronic species increases in the order. $...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2025

The incorrect decreasing order of atomic radii is

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2025

Consider the following elements ${\rm{In}},{\rm{Tl}},{\rm{Al}},{\rm{Pb}},{\rm{Sn}}$ and Ge. The most stable oxidation states of elements with highest and lowest first ionisation...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2025

Which of the following statements are NOT true about the periodic table? A. The properties of elements are function of...

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2025

The element that does not belong to the same period of the remaining elements (modern periodic table) is:

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2025

Match List-I with List-II.

JEE Main Chemistry Medium

View Solution →

Q JEE MAIN 2025

Which of the following electronegativity order is incorrect?

JEE Main Chemistry Easy

View Solution →

Q JEE MAIN 2025

Given below are two statements : Statement (I) : An element in the extreme left of the periodic table forms...

JEE Main Chemistry Easy

View Solution →