Which liberates `SO_2` with dil. `H_2SO_4`?

Which liberates SO_2 with dilute H_2SO_4

Two metals A and B have reduction potentials values -0.76V and +0.34V respectively. Which of these will liberate H_2 from dil H_2SO_4 ?

Between Zn and Cu which librates hydrogen from dil. H_2SO_4 ?

Which will liberate Hą gas from dil. H_2SO_4 ?

Two metals A and B have reduction potential values -0.76 V and + 0.34 V respectively. Which of these will liberate H_(2) from dil. H_(2)SO_(4) ?

a) i) Name the product liberated at anode when dil. H_(2)SO_(4) is electrolysed.