Question

Na2b4o7 + X = H3BO3 what is X in this reaction ?
1) aq. Solution of Naoh
2) Dil. Hno3
3) Conc . H2so4
4) water

Answer 1

Na₂B₄O₇ + H₂SO₄ + 5H₂O $\to$ 4H₃BO₃ + Na₂SO₄

Answer: 3) Conc. H₂SO₄