Copper reacts with hot conc. `H_(2)SO_(4)` to give:

HCOOH reacts with conc. H_(2)SO_(4) to give :

Carbon reacts with conc. H_(2)SO_(4) to gives

Formic acid reacts with conc . H_(2)SO_(4) to give :

Ethers react with conc. H_(2)SO_(4) to form

Assertion (A): Diethyl ether reacts with hot Conc H_(2)SO_(4) and gives ethyl hydrogen sulphate Reason (R): The reaction involves cleavage of C-O bond in diethyl ether

Zinc reacts with dilute H_(2)SO_(4) to give H_(2) . It also reacts with conc. H_(2)SO_(4) to give SO_(2) . How will you account for this difference ?