Question
Choose the INCORRECT statement
JEE Main
Chemistry
Classification of Elements and Periodicity in Properties
2026
JEE Main 2026 (24 January Shift 2)
JEE Main Chemistry Question (2026) — Solution
Options
- A. CO _ 2 is the most acidic oxide among the dioxides of group of 14 elements.
- B. Carbon exhibits negative oxidation states along with +4 and +2.
- C. Carbon cannot exceed its covalency more than four.
- D. Among the isotopes of carbon, ^ 13 C is a radioactive isotope.
Answer
D. Among the isotopes of carbon, ^ 13 C is a radioactive isotope.
Step-by-step solution
Analyzing each statement: 1 CO₂ is most acidic among group 14 dioxides - correct, it's a non-metal acidic oxide. 2 Carbon shows negative oxidation states (-4 in methane, -3 in ethane, etc.) along with +2 and +4 - correct. 3 Carbon covalency cannot exceed 4 - correct, as it's period 2 element unable to expand octet. 4 ¹³C is radioactive - incorrect. ¹³C is a stable, non-radioactive isotope. ¹⁴C is the radioactive isotope used in radiocarbon dating with half-life of 5730 years. Therefore, statement (4) is incorrect.
Related: Chemistry — Classification of Elements and Periodicity in Properties · All PYQ Banks