The normality of 0.3 M phosphorus acid (H₃PO₃) is

The oxidation number of sulphur in S₈,S₂F₂,H₂S respectively, are

How many millilitres of 0.5 M H₂SO₄ are needed to dissolve 0.5 g of copper(II) carbonate?

A plant virus is found to consist of uniform cylindrical particles of 150 Å in diameter and 5000 Å long. The specific volume of the virus is 0.75 cm³/g. If the virus is considered to be a single particle, find its molar mass.