JEE Main 2026 — Classification of Elements and Periodicity in Properties Question with Solution
JEE Main 2026 (24 January Shift 2)
Question
Choose the INCORRECT statement
Choose an option
Show full solutionCorrect option: D
Correct answer
DAmong the isotopes of carbon, is a radioactive isotope.
Step-by-step explanation
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.
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.
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This is a previous-year question from JEE Main 2026, covering the Classification of Elements and Periodicity in Properties chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.