Periodic Table · JEE Main previous year questions

2025 17 questions

1. Q692025 · 4 Apr 2025 · Shift 1

   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
   Show answer

   Answer: C

2. Q542025 · 4 Apr 2025 · Shift 2

   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
   Show answer

   Answer: A

3. Q602025 · 4 Apr 2025 · Shift 2

   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.${\mathrm{Fe}}^{2+}<{\mathrm{Fe}}^{3+}$
   Show answer

   Answer: A

4. Q702025 · 4 Apr 2025 · Shift 2

   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.$B\&Ga$
   Show answer

   Answer: C

5. Q562025 · 3 Apr 2025 · Shift 2

   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
   Show answer

   Answer: A

6. Q542025 · 2 Apr 2025 · Shift 1

   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
   Show answer

   Answer: C

7. Q582025 · 2 Apr 2025 · Shift 1

   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
   Show answer

   Answer: B

8. Q692025 · 2 Apr 2025 · Shift 1

   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
   Show answer

   Answer: C

9. Q562025 · 29 Jan 2025 · Shift 2

   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.${\mathrm{A}}_2{\mathrm{O}}_3$
   Show answer

   Answer: D

10. Q632025 · 29 Jan 2025 · Shift 2

    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.$1012\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$
    Show answer

    Answer: D

11. Q512025 · 28 Jan 2025 · Shift 1

    The incorrect decreasing order of atomic radii is

    1. A.$\mathrm{Si}>\mathrm{P}>\mathrm{Cl}>\mathrm{F}$
    2. B.$\mathrm{Mg}>\mathrm{Al}>\mathrm{C}>\mathrm{O}$
    3. C.$\mathrm{Al}>\mathrm{B}>\mathrm{N}>\mathrm{F}$
    4. D.$\mathrm{Be}>\mathrm{Mg}>\mathrm{Al}>\mathrm{Si}$
    Show answer

    Answer: D

12. Q512025 · 24 Jan 2025 · Shift 2

    The successive 5 ionisation energies of an element are $800,2427,3658,25024$ and $32824\text{ kJ/mol}$, respectively. By using the above values predict the group in which the above element is present :

    1. A.Group 4
    2. B.Group 2
    3. C.Group 13
    4. D.Group 14
    Show answer

    Answer: C

13. Q592025 · 24 Jan 2025 · Shift 2

    Given below are two statements : Statement (I) : The first ionization energy of Pb is greater than that of Sn . Statement (II) : The first ionization energy of Ge is greater than that of Si . In the light of the above statements, choose the correct answer from the options given below :

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

    Answer: D

14. Q552025 · 23 Jan 2025 · Shift 2

    Given below are the atomic numbers of some group 14 elements. The atomic number of the element with lowest melting point is :

    1. A.14
    2. B.50
    3. C.6
    4. D.82
    Show answer

    Answer: B

15. Q682025 · 23 Jan 2025 · Shift 2

    Given below are two statements about X-ray spectra of elements : Statement (I) : A plot of $\sqrt{\nu }$ ($\nu =$ frequency of X-rays emitted) vs atomic mass is a straight line. Statement (II) : A plot of $\nu$ ($\nu =$ frequency of $X$-rays emitted) vs atomic number is a straight line. In the light of the above statements, choose the correct answer from the options given below :

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

    Answer: D

16. Q562025 · 22 Jan 2025 · Shift 1

    Match List-I with List-II. | | List - I | | List - II | |---|---|---|---| | (A) | ${\mathrm{Al}}^{3+}<{\mathrm{Mg}}^{2+}<{\mathrm{Na}}^{+}<{\mathrm{F}}^{-}$ | (I) | Ionisation Enthalpy | | (B) | $\mathrm{B}<\mathrm{C}<\mathrm{O}<\mathrm{N}$ | (II) | Metallic character | | (C) | $\mathrm{B}<\mathrm{Al}<\mathrm{Mg}<\mathrm{K}$ | (III) | Electronegativity | | (D) | $\mathrm{Si}<\mathrm{P}<\mathrm{S}<\mathrm{Cl}$ | (IV) | Ionic radii | Choose the correct answer from the options given below :

    1. A.(A)-(IV), (B)-(I), (C)- (II), (D)-(III)
    2. B.(A)-(III), (B)-(IV), (C)- (II), (D)-(I)
    3. C.(A)-(II), (B)-(III), (C)- (IV), (D)-(I)
    4. D.(A)-(IV), (B)-(I), (C)- (III), (D)-(II)
    Show answer

    Answer: A

17. Q642025 · 22 Jan 2025 · Shift 1

    Which of the following electronegativity order is incorrect?

    1. A.$\mathrm{S}<\mathrm{Cl}<\mathrm{O}<\mathrm{F}$
    2. B.$\mathrm{Al}<\mathrm{Si}<\mathrm{C}<\mathrm{N}$
    3. C.$\mathrm{Al}<\mathrm{Mg}<\mathrm{B}<\mathrm{N}$
    4. D.$\mathrm{Mg}<\mathrm{Be}<\mathrm{B}<\mathrm{N}$
    Show answer

    Answer: C