Count the oxygen atoms that have oxidation number -1 in one formula unit each of H2SO5 (one O-O bond, S is +6), Na2O2 and CrO5 (Cr is +6). Give the total number.

JEE Main levelNumerical answerDifficulty 2 of 3rx024

Count the oxygen atoms that have oxidation number $- 1$ in one formula unit each of $H X_{2} SO X_{5}$ (one O-O bond, S is $+ 6$ ), $Na X_{2} O X_{2}$ and $CrO X_{5}$ (Cr is $+ 6$ ). Give the total number.

Numerical answer type, tolerance 0.01.

H X_{2} SO X_{5}

the single O-O bond gives 2 peroxide O.

Na X_{2} O X_{2}

has

O X_{2} X^{2 -}

, i.e. 2 O. In

CrO X_{5}

- p - 2 (5 - p) = - 6

gives

p = 4

. Total

= 2 + 2 + 4 = 8