Find the number of acid(s) which can form its meta derivative from the following:
H3BO3,H3PO4,H2SO4,H2SO3
In general, when an element can form several oxoacids, these are called ortho-, meta- or pyroacids, with the ortho acid being the most hydrated of the three. Two acids (H3BO3,H3PO4,) can form its meta derivative.