1.

SO_(2) + 1/2O_2 + H_2O overset((HC+NO_2))underset(underset(underset("sootparticles")"(or)")"metal oxides") rarr H_2SO_4.

Answer»

`Mn^(2+)`
`Fe^(2+)`
`NI^(2+)`
`CU^(+)`

SOLUTION :`Cu^(+2)`


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