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

Which of the following statements regarding the oxoanions of transition metals is correct?

Options

  1. AThe manganate ion ( MnO ₄²⁻ ) is diamagnetic, while the permanganate ion ( MnO ₄⁻ ) is paramagnetic.
  2. BBoth the chromate ion ( CrO ₄²⁻ ) and the permanganate ion ( MnO ₄⁻ ) are diamagnetic and involve p -d bonding
  3. CIn the dichromate ion ( Cr ₂ O ₇²⁻ ), all the Cr-O bonds are of equal length.
  4. DThe conversion of chromate to dichromate in an acidic medium is a redox process that increases the oxidation s

Correct answer

B. Both the chromate ion ( CrO ₄²⁻ ) and the permanganate ion ( MnO ₄⁻ ) are diamagnetic and involve p -d bonding

Step-by-step solution

Let us evaluate each statement: Statement 1 is incorrect. The manganate ion ( MnO ₄²⁻ ) contains Mn in the +6 oxidation state ( d^1 configuration), making it paramagnetic. The permanganate ion ( MnO ₄⁻ ) contains Mn in the +7 oxidation state ( d^0 configuration), making it diamagnetic. Statement 2 is correct. In CrO ₄²⁻ , Cr is in the +6 oxidation state ( d^0 ), and in MnO ₄⁻ , Mn is in the +7 oxidation state ( d^0 ). Both are diamagnetic. The -bonding in these oxoanions occurs via the overlap of oxygen p -orbitals

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