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p -Block elements - ll — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistryp -Block elements - ll1 Mark
MCQ
Choose $INCORRECT$ about $SO_2$
  • ✓
    $SO_2$ can not burn but supports in combustion.
  • B
    Maximum permitted atmospheric concentration of $SO_2$ for human is $5\ ppm$
  • C
    $SO_2$ is converted into $SO_3$ in presence of $V_2O_5$ at low temperature and high pressure
  • D
    $SO_2$ can act oxidizing agent as well as reducing agent depending on condition
✓

Answer

Correct option: A.
$SO_2$ can not burn but supports in combustion.
a
In $\mathrm{Na}_{2} \mathrm{S}_{4} \mathrm{O}_{6}$, the oxidation number of end sulphur atoms is +5 each and the oxidation number of middle sulphur atoms is 0 each.

The difference in the oxidation numbers of the two types of sulphur atoms is $5-0=0$.

The structure of the compound is given below:

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