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JEE Main levelSingle correct optionDifficulty 2 of 3pt212

In which pair is the central atom present in the same oxidation state in both species?

A $H X_{2} SO X_{4}$ and $HClO X_{4}$
B $H X_{3} PO X_{3}$ and $H X_{3} PO X_{4}$
C $SO X_{3}$ and $SO X_{2}$
D $H X_{3} PO X_{4}$ and $HClO X_{3}$

Answer: D

P in

H X_{3} PO X_{4}

:

3 + x - 8 = 0

gives

+ 5

. Cl in

HClO X_{3}

:

1 + x - 6 = 0

gives

+ 5

. In the other pairs the values are

+ 6/ + 7

,

+ 3/ + 5

and

+ 6/ + 4

, so only the last pair matches.

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