Colemanite `+ Na_(2)CO_(3)overset(" Fused ")rarr (A)+(B)+CO_(2)`
`underset("solution)((A))+CO_(2)rarr (B)+Na_(2)CO_(3)`
`(B)+conc.HCl rarr NaCl+underset("Acid")((C ))`
`underset("Acid")((C ))+H_(2)O rarr underset("Acid")((D))`
`(D)overset(" strong heating ")rarr (E )`
`(E )+CuSO_(4)overset(" Heated ")underset(" in flame ")rarr underset("Blue coloured compound")((F))`
Compound (D) is

Options

A. `H_(2)B_(4)O_(7)`
B. `HBO_(2)`
C. `H_(3)BO_(3)`
D. `H_(2)O`

Answer

C

Explanation

`D-H_(3)BO_(3), E-B_(2)O_(3) , F-Cu(BO_(2))_(2)`