Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET2026Chemistryd and f Block ElementsActual

The green paramagnetic species formed by heating KMn O₄ at 513 K is

Options

  1. AKO ₂
  2. BK ₂ MnO ₄
  3. CMn ₃ O ₄
  4. DMnO

Correct answer

B. K ₂ MnO ₄

Step-by-step solution

When potassium permanganate ( KMnO ₄ ) is heated at 513 K , it decomposes to form potassium manganate, manganese dioxide, and oxygen gas. 2 KMnO ₄ 513 K K ₂ MnO ₄ + MnO ₂ + O ₂ The species K ₂ MnO ₄ (potassium manganate) is green in color. In K ₂ MnO ₄ , the oxidation state of Mn is +6 . The electronic configuration of Mn ⁶⁺ is [ Ar ] 3d^1 . Since it contains one unpaired electron in the d -orbital, it is paramagnetic in nature. Thus, the green paramagnetic species formed is K ₂ MnO ₄ . Answer: K ₂ MnO ₄

Practice d and f Block Elements on Quantrex Academy →

More from d and f Block Elements

Although +3 oxidation state is most common in lanthanoids, cerium still shows +4 oxidation state because : 2026The lanthanide ion having four unpaired electrons is (Given : Atomic numbers of Ce =58 , Nd =60 , Tb =65 and Ho =67 ) 2026The calculated 'spin-only' magnetic moment of Ti ²⁺ (3d^2) is : 2026Match List I with List II : List I (Transition metal/compound/complex) List II (Catalytic Role) A. V ₂ O ₅ I. Preparation of ammonia from N ₂/ H ₂ mixture B. Fe II. Polymerisation 2026Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R . Assertion A : Generally, 3d transition metals have high melting points. Reas 2026Given below are two statements : Statement I : Ferromagnetism is considered as an extreme form of paramagnetism. Statement II : The number of unpaired electrons in a Cr ²⁺ ion ( Z 2025Which of the following set of ions act as oxidising agents? 2024The UV-visible absorption bands in the spectra of lanthanoid ions are ' X ', probably because of the excitation of electrons involving ' Y '. The ' X ' and ' Y ', respectively, are 2024 Full d and f Block Elements list All NEET PYQs