The salt that reacts with dilute hydrochloric acid to produce a pungent smelling gas which decolourizes acidified purple potassium tetraoxomanganate (VII) solution is
Na\(_2\)SO\(_4\)
Na\(_2\)SO\(_3\)
Na\(_2\)S
Na\(_2\)CO\(_3\)
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Na₂SO₃ (Sodium Sulfite):
Reacts with HCl to produce sulfur dioxide (SO₂) gas, water (H₂O), and NaCl (sodium chloride).
SO₂ is a pungent-smelling gas (like burning matches).
SO₂ is a strong reducing agent and will decolorize acidified KMnO₄.
This fits all the criteria.
C. Na₂S (Sodium Sulfide):
Reacts with HCl to produce hydrogen sulfide (H₂S) gas and NaCl (sodium chloride).
H₂S has a pungent "rotten egg" smell.
H₂S is a reducing agent and will decolorize acidified KMnO₄.
However, the smell is not typically described as "pungent" in the same way as SO₂. The question specifically asks for a "pungent" smell
The correct answer is C. Na₂S (sodium sulfide).
When sodium sulfide reacts with dilute hydrochloric acid, it produces hydrogen sulfide gas (H₂S), which has a pungent smell (like rotten eggs). Hydrogen sulfide is a reducing agent and can decolourize acidified potassium permanganate (KMnO₄) solution.
