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JEE Advanced levelSingle correct optionDifficulty 3 of 3bn147

Metal oxidation states are taken as Ba $+ 2$ , Mn $+ 4$ , Pb $+ 4$ , Ti $+ 4$ . Which listed compound must contain the peroxide ion, and what is its correct IUPAC name?

A $MnO X_{2}$ , manganese(IV) peroxide
B $BaO X_{2}$ , barium peroxide
C $PbO X_{2}$ , lead(IV) oxide
D $BaO X_{2}$ , barium(IV) oxide

Answer: B

For

BaO X_{2}

:

+ 2 + 2 x = 0

gives O

= - 1

, so peroxide. For

MnO X_{2}

,

PbO X_{2}

,

TiO X_{2}

O is

- 2

(oxides). Barium is always

+ 2

, so no Stock numeral of IV is possible.

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