Periodic Table · JEE Main previous year questions

First and second ionization enthalpies of lithium are $520\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$ and $7297\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$ respectively. Energy required to convert $3.5\mathrm{mg}$ lithium (g) into $\mathrm{L}{\mathrm{i}}^{2+}(\mathrm{g})$ [$\mathrm{Li}(\mathrm{g})\to \mathrm{L}{\mathrm{i}}^{2+}(\mathrm{g})$] is ____ $\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$. (nearest integer) [Molar mass of $\mathrm{Li}=7\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$]

In a period, the first ionisation enthalpy of the element at extreme left and the negative electron gain enthalpy of the extreme right element, except noble gases, are respectively.

1. A.lowest and lowest
2. B.highest and lowest
3. C.lowest and highest
4. D.highest and highest

A monoatomic anion $({\mathrm{A}}^{-})$ has 45 neutrons and 36 electrons. Atomic mass, group in the periodic table and physical state at room temperature of the element $(\mathrm{A})$ respectively are

1. A.$80,17$, liquid
2. B.$81,16$, solid
3. C.$80,16$, gas
4. D.$81,15$, gas

Given below are two statements: Statement I: The covalency of oxygen is generally two but it can exceed upto four. The oxidation state of oxygen in $\mathrm{S}{\mathrm{O}}_2$ is $-2$ and in $\mathrm{O}{\mathrm{F}}_2$ it is $+2$. Statement II: The anomalous behaviour of oxygen when compared to the other elements of group 16 is due to its small size and high electronegativity. In the light of the above statements, choose the correct answer from the options given below

1. A.Both Statement I and Statement II are true
2. B.Both Statement I and Statement II are false
3. C.Statement I is true but Statement II is false
4. D.Statement I is false but Statement II is true

What is the energy (in $\mathrm{J}\mathrm{ato}{\mathrm{m}}^{-1}$) required for the following process ? $$\mathrm{L}{\mathrm{i}}^{2+}(\mathrm{g})\to \mathrm{L}{\mathrm{i}}^{3+}(\mathrm{g})+{\mathrm{e}}^{-}$$ (Take the ionization energy for the H atom in the ground state as $2.18\times 10^{-18}\mathrm{J}\mathrm{ato}{\mathrm{m}}^{-1}$)

1. A.$8.72\times 10^{-18}$
2. B.$1.962\times 10^{-18}$
3. C.$1.962\times 10^{-17}$
4. D.$6.54\times 10^{-17}$

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

1. A.$\mathrm{Rb}$ & $\mathrm{Br}$
2. B.$\mathrm{Na}$ & $\mathrm{Cl}$
3. C.$\mathrm{K}\&\mathrm{Br}$
4. D.$\mathrm{K}\&\mathrm{Se}$

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.

1. A.7 and 5
2. B.6 and 7
3. C.5 and 7
4. D.5 and 6

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 radius is always greater than the ionic radius for any element. In the light of the above statements, choose the correct answer from the options given below

1. A.Both Statement I and Statement II are false
2. B.Statement I is false but Statement II is true
3. C.Statement I is true but Statement II is false
4. D.Both Statement I and Statement II are true

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

1. A.$\mathrm{Si}<\mathrm{S}<\mathrm{Al}<\mathrm{P}<\mathrm{Cl}$
2. B.$\mathrm{Al}<\mathrm{Si}<\mathrm{S}<\mathrm{P}<\mathrm{Cl}$
3. C.$\mathrm{S}<\mathrm{Si}<\mathrm{Al}<\mathrm{P}<\mathrm{Cl}$
4. D.$\mathrm{Al}<\mathrm{S}<\mathrm{P}<\mathrm{Si}<\mathrm{Cl}$

The correct statements from the following are : A. Ionic radii of trivalent cations of group 13 elements decreases down the group. B. Electronegativity of group 13 elements decreases down the group. C. Among the group 13 elements, Boron has highest first ionisation enthalpy. D. The trichloride and triiodide of group 13 elements are covalent in nature. Choose the correct answer from the options given below :

1. A.B and D Only
2. B.C and D Only
3. C.A and D Only
4. D.A and C Only

Given below are two statements : Statement I : The second ionisation enthalpy of Na is larger than the corresponding ionisation enthalpy of Mg . Statement II : The ionic radius of ${\text{O}}^{2-}$ is larger than that of ${\text{F}}^{-}$. In the light of the above statements, choose the correct answer from the options given below :

1. A.Statement I is true but Statement II is false
2. B.Statement I is false but Statement II is true
3. C.Both Statement I and Statement II are true
4. D.Both Statement I and Statement II are false

Elements X and Y belong to Group 15. The difference between the electronegativity values of ' X ' and phosphorus is higher than that of the difference between phosphorus and ' Y '. ' X ' & ' Y ' are respectively

1. A.As & Bi
2. B.Bi & N
3. C.N & As
4. D.As & Sb

A 'p'-block element $(\mathrm{E})$ and hydrogen form a binary cation $(\mathrm{E}{\mathrm{H}}_{\mathrm{x}}{)}^{+}$, while $\mathrm{E}{\mathrm{H}}_3$ on treatment with ${\mathrm{K}}_2\mathrm{Hg}{\mathrm{I}}_4$ in alkaline medium gives a precipitate of basic mercury(II)amido-iodine. Given below are first ionisation enthalpy values $\left(\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}\right)$ for first element each from group 13, 14, 15 and 16. Identify the correct first ionisation enthalpy value for element E.

1. A.1402
2. B.1086
3. C.801
4. D.1312

Which of the following represents the correct trend for the mentioned property? A. F > P > S > B - First Ionization Energy B. Cl > F > S > P - Electron Affinity C. K > Al > Mg > B - Metallic character D. ${\mathrm{K}}_2\mathrm{O}>\mathrm{N}{\mathrm{a}}_2\mathrm{O}>\mathrm{MgO}>\mathrm{A}{\mathrm{l}}_2{\mathrm{O}}_3$ - Basic character Choose the correct answer from the options given below :

1. A.B and C only
2. B.A, B and D only
3. C.A and B only
4. D.A, B, C and D

Given below are two statements : Statement I : The correct order in terms of atomic/ionic radii is Al > Mg > $\mathrm{M}{\mathrm{g}}^{2+}$ > $\mathrm{A}{\mathrm{l}}^{3+}$. Statement II : The correct order in terms of the magnitude of electron gain enthalpy is Cl > Br > S > O. In the light of the above statements, choose the correct answer from the options given below :

1. A.Statement I is true but Statement II is false
2. B.Both Statement I and Statement II are true
3. C.Statement I is false but Statement II is true
4. D.Both Statement I and Statement II are false

Given below are the pairs of group 13 elements showing their relation in terms of atomic radius. $(\mathrm{B}<\mathrm{Al}),(\mathrm{Al}<\mathrm{Ga}),(\mathrm{Ga}<\mathrm{In})$ and $(\mathrm{In}<\mathrm{Tl})$ Identify the elements present in the incorrect pair and in that pair find out the element $(\mathrm{X})$ that has higher ionic radius $({\mathrm{M}}^{3+})$ than the other one. The atomic number of the element $(\mathrm{X})$ is

1. A.49
2. B.81
3. C.31
4. D.13

Given below are two statements : Statement (I) : The first ionisation enthalpy of group 14 elements is higher than the corresponding elements of group 13. Statement (II) : Melting points and boiling points of group 13 elements are in general much higher than those of corresponding elements of group 14. In the light of the above statements, choose the most appropriate answer from the options given below :

1. A.Statement I is correct but Statement II is incorrect
2. B.Both Statement I and Statement II are incorrect
3. C.Statement I is incorrect but Statement II is correct
4. D.Both Statement I and Statement II are correct

The incorrect relationship in the following pairs in relation to ionisation enthalpies is :

1. A.${\mathrm{Mn}}^{2+}<{\mathrm{Fe}}^{2+}$
2. B.${\mathrm{Mn}}^{+}<{\mathrm{Mn}}^{2+}$
3. C.${\mathrm{Mn}}^{+}<{\mathrm{Cr}}^{+}$
4. D.${\mathrm{Fe}}^{2+}<{\mathrm{Fe}}^{3+}$

The elements of Group 13 with highest and lowest first ionisation enthalpies are respectively :

1. A.$\mathrm{B}\&\mathrm{Tl}$
2. B.$\mathrm{Tl}\&\mathrm{B}$
3. C.$B\&\mathrm{In}$
4. D.$B\&Ga$

The correct orders among the following are A. Atomic radius : $\mathrm{B}<\mathrm{Al}<\mathrm{Ga}<\mathrm{In}<\mathrm{Tl}$ B. Electronegativity : $\mathrm{Al}<\mathrm{Ga}<\mathrm{In}<\mathrm{Tl}<\mathrm{B}$ C. Density : $\mathrm{Tl}<\mathrm{In}<\mathrm{Ga}<\mathrm{Al}<\mathrm{B}$ D. 1st Ionisation Energy : $\mathrm{In}<\mathrm{Al}<\mathrm{Ga}<\mathrm{Tl}<\mathrm{B}$ Choose the correct answer from the options given below:

1. A.B and D Only
2. B.A and B Only
3. C.C and D Only
4. D.A and C Only

Given below are two statements : Statement (I) : The metallic radius of Al is less than that of Ga . Statement (II) : The ionic radius of ${\mathrm{Al}}^{3+}$ is less than that of ${\mathrm{Ga}}^{3+}$. In the light of the above statements, choose the most appropriate answer from the options given below :

1. A.Statement I is correct but Statement II is incorrect
2. B.Both Statement I and Statement II are correct
3. C.Statement I is incorrect but Statement II is correct
4. D.Both Statement I and Statement II are incorrect

A molecule with the formula ${\mathrm{AX}}_4\mathrm{Y}$ has all its elements from p-block. Element A is rarest, monoatomic, non-radioactive from its group and has the lowest ionization enthalpy value among A, X and Y . Elements X and Y have first and second highest electronegativity values respectively among all the known elements. The shape of the molecule is:

1. A.Pentagonal planar
2. B.Square pyramidal
3. C.Trigonal bipyramidal
4. D.Octahedral

The property/properties that show irregularity in first four elements of group-17 is/are (A) Covalent radius (B) Electron affinity (C) Ionic radius (D) First ionization energy Choose the correct answer from the options given below :

1. A.A, B, C and D
2. B.A and C only
3. C.B only
4. D.B and D only

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

1. A.$\mathrm{AO}$
2. B.$\mathrm{A}{\mathrm{O}}_2$
3. C.${\mathrm{A}}_2\mathrm{O}$
4. D.${\mathrm{A}}_2{\mathrm{O}}_3$

First ionisation enthalpy values of first four group 15 elements are given below as the options. Choose the correct value for the element that is a main component of apatite family :

1. A.$834\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$
2. B.$947\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$
3. C.$1402\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$
4. D.$1012\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$