Barium peroxide is treated with ice-cold dilute sulphuric acid ; the precipitate is filtered off and the filtrate contains the compound (Y). The compound (Y) on warming decomposes to (Z) and a gas (W).
Find the sum of the bond order of the oxygen-oxygen bond in (Y) and the bond order of (W).

Question

Barium peroxide is treated with ice-cold dilute sulphuric acid ; the precipitate is filtered off and the filtrate contains the compound (Y). The compound (Y) on warming decomposes to (Z) and a gas (W).

Find the sum of the bond order of the oxygen-oxygen bond in (Y) and the bond order of (W).

TestHub · Accepted Answer

Barium peroxide reacts with cold, dilute sulphuric acid:

$Ba O_{2} + H_{2} S O_{4} \to BaS O_{4} ↓ + H_{2} O_{2}$ .

The precipitate is removed, so Y is hydrogen peroxide.

On warming, $2 H_{2} O_{2} \to 2 H_{2} O + O_{2} ↑$ , so W is oxygen.

The oxygen-oxygen single bond in Y has bond order 1

the bond order of W is 2.

The required sum is $1 + 2 = 3$ .

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