if it will occur.Complete the balanced reaction?

Question

State "does not occur" if the reaction will not take place
a) Na + HNO3 --->

b) Ni(II) + Cu2O -->

c) Zn + Mg(NO3)2 -->

Answer 1

a) NaOH + NO2

b) Does not happen

c) Does not happen

Answer 2

2Na + 2HNO3-------->2NaNO3 + H2

Ni(ii) + CuO-------->Cu + NiO

Zn + Mg(NO3)2------>does not occur

Cu2O is not the formula for copper oxide because both copper and oxygen have valencies of 2 so the 2 cancel each other.

reaction number 3 will not occur because magnesium nitrate is a salt and zinc is a metal and a metal and a salt cannot react