What is the oxidation state of mn atom

Consider the nuclear equation below. 239/94 pu—-> x+ 4/2 he. what is x?

A5.000 g sample of niso4 h2o decomposed to give 2.755 g of anhydrous niso4. what is the formula of the hydrate? what is the full chemical name for the hydrate? what is the molar mass of the hydrate? niso4•_h2o what is the mass % of water in the hydrate?

Can someone me out on this question for my national 5 chemistry homework