`H_(2)SO_(4)` acts as an oxidising agent, a dehydrating agent, and an acid. Among each of the following reactions, which behaviour is shown by `H_(2)SO_(4)`?
a.`C_(6)H_(12)O_(6)+H_(2)SO_(4)(conc)rarr6C+6H_(2)O`
b. `5H_(2)SO_(4)(conc)+4ZnrarrH_(2)S+4Zn^(2+)+4SO_(4)^(2-)+4H_(2)O`
c. `H_(2)SO_(4)(dil)+ZnrarrZn^(2+)+H_(2)+SO_(4)^(2-)`
d. `H_(2)SO_(4)(dil)ZnCO_(3)rarrZn^(2+)+CO_(2)+CO_(2)+SO_(4)^(2-)+H_(2)O`

Explanation

a. As a dehydrating agent, since it simply removes water from glucose.
b. `H_(2)SO_(4)(S "in"+6 state)rarrH_(2)S(S "in" -2 state)`, i.e., acid is reduced. So it acts as an oxidising agent.
c. All strong acids liberate `H_(2)` with active metals such as `Zn`(i.e, it is reduced) unless `SO_(4)^(2-)` is reduced. In this case, `H^(o+)` is reduced to `H_(2)`. So it acts as an oxidising agent. We can also call it as an acidic property.
d. Simply an acid.