Given below are two statements on ionization enthalpy and electron gain enthalpy
Q. Given below are two statements :

Statement I : C < O < N < F is the correct order in terms of first ionization enthalpy values.

Statement II : S > Se > Te > Po > O is the correct order in terms of the magnitude of electron gain enthalpy values.

In the light of the above statements, choose the correct answer from the options given below :
A. Both Statement I and Statement II are false
B. Statement I is false but Statement II is true
C. Statement I is true but Statement II is false
D. Both Statement I and Statement II are true
Correct Answer: Both Statement I and Statement II are true

Explanation

First ionization enthalpy generally increases across a period. However, due to half-filled stability of nitrogen, oxygen has lower ionization enthalpy than nitrogen. Hence, the correct increasing order is C < O < N < F, making Statement I true.

Electron gain enthalpy depends on atomic size and inter-electronic repulsion. In group 16, oxygen has lower magnitude of electron gain enthalpy due to its small size and high repulsion, while sulphur has the highest magnitude. Thus the correct order is S > Se > Te > Po > O, making Statement II true.

Therefore, both Statement I and Statement II are correct.

Related JEE Main Questions

Among H₂S, H₂O, NF₃, NH₃ and CHCl₃, identify the molecule (X) with lowest dipole moment value. The number of lone pairs of electrons present on the central atom of the molecule (X) is :
Two masses m and 2 m are connected by a light string going over a pulley (disc) of mass 30 m with radius r = 0.1 m. The pulley is mounted in a vertical plane and it is free to rotate about its axis. The 2 m mass is released from rest and its speed when it has descended through a height of 3.6 m is ____ m/s.
A cylindrical conductor of length 2 m and area of cross-section 0.2 mm² carries an electric current of 1.6 A when its ends are connected to a 2 V battery. Mobility of electrons in the conductor is α × 10⁻³ m²/V·s. The value of α is :
A capacitor P with capacitance 10 × 10⁻⁶ F is fully charged with a potential difference of 6.0 V and disconnected from the battery. The charged capacitor P is connected across another capacitor Q with capacitance 20 × 10⁻⁶ F. The charge on capacitor Q when equilibrium is established will be α × 10⁻⁵ C (assume capacitor Q does not have any charge initially), the value of α is ____.
A conducting circular loop is rotated about its diameter at a constant angular speed of 100 rad s⁻¹ in a magnetic field of 0.5 T perpendicular to the axis of rotation.
Home / JEE Main Chemistry

Updated for JEE Main 2026: This PYQ is important for JEE Mains, JEE Advanced and other competitive exams. Practice more questions from this chapter.

Scroll to Top