Which of the following statements are true? A. Unlike Ga that has a very high melting point, Cs has a very low melting point. B. On Pauling scale, the electronegativity values of N and Cl are not the same. C. Ar, K^+, Cl^-, Ca^2+, and S^2- are all isoelectronic species. D. The correct order of the first ionization enthalpies of Na, Mg, Al, and Si is Si > Al > Mg > Na. E. The atomic radius of Cs is greater than that of Li and Rb. Choose the correct answer from the options given below :

NEET UG 2025 · Chemistry · Question 47

NEET 2025 Chemistry, question 47

Question 47 of the NEET 2025 paper (code 45) is a Chemistry question from Classification of Elements and Periodicity in Properties. Its idea, Ionization Enthalpy Trends, was asked 3 times, in 2019, 2024 and 2025, across NEET 2017–2026. The NTA final answer key gives option 2.

Updated 2026-10-08

Q47 · Chemistry

K^+

1 A, B, and E only 2 C and E only Official answer 3 C and D only 4 A, C, and E only

Official answer: option 2 · NTA final answer key

Same idea

Ionization Enthalpy Trends, in other papers

NEET asked this idea 3 times, in 2019, 2024 and 2025. The other 2 questions below.

2024 Q 71 Arrange the following elements in increasing order of first ionization enthalpy: Li, Be, B, C, N Choose the correct answer from the\dots One-line MCQ \cdot Medium 2019 Q 60 For the second period elements the correct increasing order of first ionisation enthalpy is : One-line MCQ \cdot Medium

Ionization Enthalpy Trends: every question and how it was framed

The chapter

Classification of Elements and Periodicity in Properties in ten years of NEET

13 questions from 2017–2026, asked in 9 of 10 papers, about 1.3 a paper. Periodic Properties alone had 13.

Chapter analysis Study this chapter Practise this chapter

Ionization Enthalpy Trends, in other papers

Classification of Elements and Periodicity in Properties in ten years of NEET

Classification of Elements and Periodicity in Properties: questions per paper