Among the following, cyclic species are :<br>(I) H5P3O10<br>(II) [B3O3(OH)5]^2-<br>(III) H5P5O15<br> — p Block Elements Chemistry Question

💡 Solution & Explanation

Step 1: Classify the structure of each species. H5P3O10 is triphosphoric acid, which contains three phosphate tetrahedra linked in a linear, open-chain skeleton. Step 2: [B3O3(OH)5]2- is a cyclic triborate anion containing a six-membered B-O ring. H5P5O15 is cyclopentaphosphoric acid, which is a cyclic oligomer. P3N3Cl6 (phosphonitrilic chloride trimer) has an inorganic six-membered ring with alternating P and N atoms. Step 3: Since II, III, and IV are cyclic and I is linear, the correct combination is II, III, IV, matching option (c).