Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE MainChemistryd and f Block Elements

Given below are two statements: Statement I: KMnO ₄ oxidizes iodide to iodate in faintly alkaline medium, whereas in acidic medium it oxidizes iodide to iodine. Statement II: K ₂ Cr ₂ O ₇ oxidizes iodide to iodate and hydrogen sulfide to sulfur in acidic medium. In the light of the above statements, choose the most appropriate answer from the options given below:

Options

  1. AStatement I is true but Statement II is false
  2. BBoth Statement I and Statement II are true
  3. CBoth Statement I and Statement II are false
  4. DStatement I is false but Statement II is true

Correct answer

A. Statement I is true but Statement II is false

Step-by-step solution

Statement I is true. In faintly alkaline or neutral medium, KMnO ₄ oxidizes iodide ( I ^- ) to iodate ( IO ₃^- ). In acidic medium, KMnO ₄ oxidizes iodide to iodine ( I ₂ ). Statement II is false. In acidic medium, K ₂ Cr ₂ O ₇ oxidizes hydrogen sulfide ( H ₂ S ) to sulfur ( S ), but it oxidizes iodide ( I ^- ) to iodine ( I ₂ ), not to iodate ( IO ₃^- ). Therefore, Statement I is true but Statement II is false. Answer: Statement I is true but Statement II is false

Practice d and f Block Elements on Quantrex Academy →

More from d and f Block Elements

Given below are two statements: Statement I: The number of pairs among [ Ti ⁴⁺, V ²⁺] , [ V ²⁺, Mn ²⁺] , [ Mn ²⁺, Fe ³⁺] and [ V ²⁺, Cr ²⁺] in which both ions are coloured is 3 . S 2026Given below are two statements for catalytic properties of transition metals. Statement I: First row transition metals which act as catalyst utilise their 3d electrons only for 2026The correct order of first ( _i H₁) and second ( _i H₂) ionisation enthalpy values of Cr and Mn are : A. _i H₁ : Cr > Mn B. _i H₂ : Cr > Mn C. _i H₁ : Mn > Cr D. _i H₂ : Mn > Cr Ch 2026The correct statements among the following are. A. Basic vanadium oxide is used in the manufacture of H ₂ SO ₄ . B. The spin-only magnetic moment value of the transition metal hali 2026Given below are two statements : Statement I: Presence of large number of unpaired electrons in transition metal atoms results in higher enthalpies of their atomisation. Statement 2026A paper dipped in a dil. H₂SO₄ solution of ' X ' upon treatment with SO₂ gas turns into green. The compound ' X ' is : 2026Which of the following is NOT a physical or chemical characteristics of interstitial compounds? 2026Pairs of elements with the same number of electrons in their respective 4f orbital are [Atomic number. Eu-63, Gd-64, Dy-66, Ho-67, Tm-69, Yb-70, Lu-71, Hf-72] A. (Eu and Gd) B. (Dy 2026 Full d and f Block Elements list All JEE Main PYQs