Name the gas that can readily decolourise acidified KMnO _ 4...

Name the gas that can readily decolourise acidified

{KMnO}_{4}

solution.

Options

A ${CO}_{2}$
B ${SO}_{2}$
C ${NO}_{2}$
D ${P}_{2}{O}_{5}$

Correct answer

B. ${SO}_{2}$

Step-by-step solution

${SO}_{2}$ readily decolourises acidified ${KMnO}_{4} .$

$K\overset{+ 7}{Mn}{O}_{4} + \overset{+ 4}{S}{O}_{2} \to \mathop{{MnSO}_{4}}_{Colourless} + {H}_{2}{SO}_{4} + {K}_{2}{SO}_{4}$

Potassium permagnate gives the colouless solution with sulphurdioxide.

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 NEET PYQs