Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app

JIPMER 2004

Exam: JIPMER
Year: 2004
Subject: Chemistry
Chapter: d and f Block Elements

JIPMER 2004 · Chemistry · d and f Block Elements

Which of the following turns potassium dichromate paper green?

Which of the following turns potassium dichromate paper green?

Options

A $\mathrm{NO}_2$
BHCl
C $\mathrm{NH}_3$
D $\mathrm{SO}_2$

Correct answer

D. $\mathrm{SO}_2$

Step-by-step solution

\mathrm{SO}_2

gas is a reducing agent, hence turns dichromate paper green due to formation of chromium sulphate. Sulphite radical

\left(\mathrm{SO}_3^{2-}\right)

is identified by this:

\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7+3 \mathrm{SO}_2+\mathrm{H}_2 \mathrm{SO}_4 \longrightarrow \underset{\text{ green }}{\mathrm{Cr}_2\left(\mathrm{SO}_4\right)_2} +\mathrm{K}_2 \mathrm{SO}_4+\mathrm{H}_2 \mathrm{O}

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… NEET 2026 The lanthanide ion having four unpaired electrons is (Given : Atomic numbers of Ce =58… NEET 2026 The green paramagnetic species formed by heating KMnO _4 at 513 K is NEET 2026 The calculated 'spin-only' magnetic moment of Ti^ 2+ \ (3d^2) is : NEET 2026 Match List I with List II : List I (Transition metal/compound/complex) List II (Catalytic… NEET 2026 Given below are two statements : One is labelled as Assertion A and the other is labelled… NEET 2026 Given below are two statements : Statement I : Ferromagnetism is considered as an extreme… NEET 2025 Which of the following set of ions act as oxidising agents? NEET 2024 Full d and f Block Elements list All JIPMER PYQs