How many of the following have peroxo linkages: H_2S_2O_3, H_2S_2O_8, H_2SO_5, CrO_5, BaO_2, K_2O_2?

JEE Main Chemistry question

How many of the following have peroxo linkages: , , , , , ?

Answer: 5

Solution

(thiosulphuric acid) has no – bond (the second replaces an , not bonds to one). (Marshall's acid) has one peroxo bridge linking the two units; (Caro's acid)

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Question ID VK-146108