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Tests for Sulphuric Acid

Which reagent...

Question

Which reagent is used in qualitative testing for the presence of sulphur dioxide?

A

Sodium Chloride

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B

Iron (II) sulphate

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C

Vanadium (V) oxide

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D

Potassium permanganate

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Solution

The correct option is D Potassium permanganate
Acidified potassium permanganate is used to test the presence of $S O_{2}$ . A filter paper or cotton wool dipped in acidified $K M n O_{4}$ is held over the gas, the former decolorizes, confirming the presence of gas.
$2 M n O {_{4}}^{-} + 5 S O_{2} + 2 H_{2} O \to 5 S O_{4}^{2 -} + 2 M n^{2 +} + 4 H^{+}$

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Q. The sodium test, or Lassaigne’s test, is used in an elemental analysis of the qualitative determination of the presence of foreign elements, namely halogens, nitrogen, sulphur and phosphorus in an organic compound.
The test involves heating the sample strongly with a clean sodium metal, ‘fusing’ it with the sample. The ‘fused’ sample is then plunged into water, and the usual qualitative tests are performed on the resultant solution for the respective possible constituents.
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Q. Which of the following reagents is used to test the presence of

S O_{2}

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