Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
99 Percentile Qs Bank for JEE MainChemistryd and f Block Elements

In chemical reaction of potassium ferrocyanide and hydrogen peroxide in the presence of dil. H 2 S O 4

Options

  1. AFerrocyanide gets reduced to ferricyanide
  2. BFerrocyanide gets oxidised
  3. CIron does not change its oxidation state
  4. DHydrogen peroxide is oxidised

Correct answer

B. Ferrocyanide gets oxidised

Step-by-step solution

In reaction of potassium ferrocyanide and hydrogen peroxide in the presence of dil. H 2 S O 4 [ F e ( C N ) 6 ] 4 - is oxidised by H 2 O 2 into [ F e ( C N ) 6 ] 3 - ions. 2 K 4 [Fe ( CN ) 6 ] + H 2 O 2 → 2 K 3 [Fe ( CN ) 6 ] + 2 KOH

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 99 Percentile Qs Bank for JEE Main PYQs