Na2B4O7+2HCl⟶2NaCl+A Na2B4O7+H2SO4→Na2SO4+A. A is as follows:
Na2B4O7+2HCl⟶2NaCl+H2B4O7 Na2B4O7+H2SO4→Na2SO4+H2B4O7
Na2B4O7+2HCl⟶2NaCl+A Na2B4O7+H2SO4→Na2SO4+A. A is?
B+H2SO4→A+SO2
B+HNO3→A+NO2 A is