Question

draw a neat labelled diagram of liberation of co2 on heating caco3,liberation of no2 on decomposing  ph[no3]2,liberation of hydrogen by displacement reaction of zn and hcl reduction of copper oxide to cu
pleazzzz make it fast 

Answer 1

no3) Zn + HCl gives ZnCl + H∨2
No1)CaCO∨3 gives CaO + CO∨2
reduction of copper oxide to copper is
CuO gives Cu + O∨2