Count the peroxo (O-O) linkages: CrO5 (one Cr=O and two peroxo groups bound to Cr), H2SO5 (one peroxo group) and H2S2O8 (one peroxo group). What is the TOTAL number of O-O linkages in one molecule each of the three? Give a whole number.

JEE Advanced levelNumerical answerDifficulty 3 of 3bn219

Count the peroxo (O-O) linkages: $CrO X_{5}$ (one Cr=O and two peroxo groups bound to Cr), $H X_{2} SO X_{5}$ (one peroxo group) and $H X_{2} S X_{2} O X_{8}$ (one peroxo group). What is the TOTAL number of O-O linkages in one molecule each of the three? Give a whole number.

Numerical answer type, tolerance 0.5.

CrO X_{5}

has 2,

H X_{2} SO X_{5}

has 1 and

H X_{2} S X_{2} O X_{8}

has 1. Total

= 2 + 1 + 1 = 4