Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main202126 Feb 2021Morning ShiftChemistryp Block Elements (Group 15, 16, 17 & 18)Actual

On treating a compound with warm dil. H 2 SO 4 , gas X is evolved which turns K 2 Cr 2 O 7 paper acidified with dil. H 2 SO 4 to a green compound Y . X and Y respectively are :

Options

  1. AX = SO 2 ,   Y = Cr 2 O 3
  2. BX = SO 2 ,   Y = Cr 2 SO 4 3
  3. CX = SO 3 ,   Y = Cr 2 SO 4 3
  4. DX = SO 3 ,   Y = Cr 2 O 3

Correct answer

C. X = SO 3 ,   Y = Cr 2 SO 4 3

Step-by-step solution

Sulfur dioxide gas turns acidified potassium dichromate (VI) solution from orange to green. Chromium is reduced from (VI) to (III) after reaction. SO 2 + dil   H 2 SO 4 ⟶ SO 3 g SO 3 + K 2 Cr 2 O 7 → H 2 SO 4 dil Cr 2 SO 4 3 Hence, On treating a compound with warm dil. H 2 SO 4 , gas X is evolved which turns K 2 Cr 2 O 7 paper acidified with dil. H 2 SO 4 to a green compound Y . X and Y respectively are SO 3 and Cr 2 ( SO 4 ) 3 .

Practice p Block Elements (Group 15, 16, 17 & 18) on Quantrex Academy →

More from p Block Elements (Group 15, 16, 17 & 18)

Correct statement(s) about the compounds X , Y and Z is(are) 2026Correct statement(s) about the compounds P , Q and R is(are) 2026Find the correct statements related to group 15 hydrides. A. Reducing nature increases from NH₃ to BiH₃ B. Tendency to donate lone pair of electrons decreases from NH₃ to BiH₃ C. T 2026Treatment of a gas ' X ' with a freshly prepared ferrous sulphate solution gives a compound ' Y ' as a brown ring. The compounds X and Y are. 2026Correct statements from the following are: A. Nitrogen in oxidation states from +1 to +4 disproportionates in acid medium. B. Nitrogen has the ability to form d - p multiple bonds 2026Given below are two statements: Statement I: The covalency of oxygen is generally two but it can exceed upto four. The oxidation state of oxygen in SO₂ is -2 and in OF₂ it is +2 . 2026Given below are two statements : Statement (I) : Oxidising power of halogens decreases in the order F₂ > Cl₂ > Br₂ > I₂ , which is the basis of "Layer test". Statement (II) : "Laye 2026Given below are two statements : Statement I : The increasing order of boiling point of hydrogen halides is HCl Statement II : The increasing order of melting point of hydrogen hal 2026 Full p Block Elements (Group 15, 16, 17 & 18) list All JEE Main PYQs