In the given reaction the value of x is _____________. `B+xHNO_(3)toH_(3)BO_(3)+xNO_(2)`

H_(3)BO_(3) is.

H_(3)BO_(3) is :

For the redox reaction given, what is the value of (x)/(z) ? xNO_(3)^(-)+yAs_(2)S_(3)+zH_(2)O to -----AsO_(4)^(3-)+-----NO+------SO_(4)^(2-)+-----H^(+) .