1.

Complete the reaction: (i) H_(3)BO_(3)underset(373K)(to)A+H_(2)O (ii) Aunderset(413K)(to)B+H_(2)O Bunderset(("Red hot"))(to)C+H_(2)O

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Solution :Boric ACID when heated at 373 K gives metaboric acid (A) and A heated at 413 K it gives tetraboric acid (B).B heated at red HOT it gives boric anhydride (C).
`4H_(3)BO_(3)underset(373K)(to)underset((A))(4HBO_(2))+H_(2)O`
`4HBO_(2)overset(413K)(to)underset((B))(H_(2)B_(4)O_(7))+H_(2)O`
`H_(2)B_(4)O_(7)overset("Red hot")(to)underset((C))(2B_(2)O_(3))+H_(2)O`


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