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Whate happens when (write chemical equat...

Whate happens when (write chemical equations only)
(i) Hot and conc. `H_(2)SO_(4)` reacts with copper
(ii) KI reacts with conc. `H_(2)SO_(4)`
(iii) Concentrated `H_(2)SO_(4)` is added to calcium fluoride ?
(iv) `SO_(3)` is passed through water.

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What happens when (i) Concentrated H_2 SO_4 is added to calcium fluoride. (ii) SO_3 is passed through water ?

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

Conc. H_(2)SO_(4) is not

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

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

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