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JEE Main levelSingle correct optionDifficulty 2 of 3pb205

Red lead, $Pb X_{3} O X_{4}$ , contains lead in two oxidation states. It can be regarded as

A $PbO \cdot 2 PbO X_{2}$
B $PbO \cdot PbO X_{2}$
C $2 PbO \cdot PbO X_{2}$
D $Pb X_{2} O X_{3} \cdot PbO$

Answer: C

Three Pb atoms balancing four oxygens (charge -8) require 2 x (+2) + (+4) = +8. So two Pb are +2 and one is +4, i.e.

2 PbO \cdot PbO X_{2}

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