[" produces "(30)" An gives "H_(2)" gas with "H_(2)SO_(4)" and "HCl" but not "],[" is "lim_(1)(1)/(1)=[[12," bith "HNO_(2)" because "(H_(2)SO_(4))/(2)+(1+n_(2))*cos2 pi sec^(2)theta*2*2*2],[1," with "HNO_(3)" because "]" agent when react with "],[" 4Cl "^(2)" Is "Zn" acts as an oxidising agent when react with "],[2" ) "HNO_(3)" is weaker acid than "H,SO_(4)" and "HCl],[" 3) In electrochemical series "Zn" is above hydrogen "],[" 4) "NO_(3)" - reduced in preference to hydronium ion "],[31." How many grams of Barium hvdride must be "]