Exams › JEE Main › Chemistry

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R Assertion A : In TlI3, isomorphous to CsI3, the metal is present in +1 oxidation state. Reason R : Tl metal has fourteen f electrons in the electronic configuration. In the light of the above statements, choose the most appropriate answer from the options given below :

1. A is correct but R is not correct
2. Both A and R are correct and R is the correct explanation of A.
3. A is not correct but R is correct
4. Both A and R are correct but R is NOT the correct explanation of A.

Correct answer: A is correct but R is not correct

Solution

Assertion A is correct because thallium (Tl) in TlI3 is indeed in the +1 oxidation state. However, Reason R is incorrect as thallium does not have fourteen f electrons; it has a different electron configuration that does not support the claim made in R.

Related JEE Main Chemistry questions

• Which of the following arrangements shows the decreasing order of acidic nature?
• Which of the following sequences correctly arranges Al₂O₃, SiO₂, P₂O₃ and SO₂ in increasing acid strength?
• Which one of the following oxides shows amphoteric behaviour?
• In boric acid (H₃BO₃), the hybridisation states of the boron atom and the oxygen atoms are, respectively,
• A xenon fluoride compound contains 53.5% xenon by mass. What oxidation state does xenon have in this compound?
• For a cement of good quality, what should be the approximate ratios of the following? I. Silica to alumina II. CaO to the combined oxides of SiO2, Al2O3 and Fe2O3

⚔️ Practice JEE Main Chemistry free + battle 1v1 →