Question

how will you obtain sulphuric acid from an acidic oxide. please tell me answer

Answer 1

The acidic oxide from which sulphuric acid is obtained is called sulphur dioxide (SO2), but it is first converted to sulphur trioxide (another acidic oxide).

Stage 1
Sulfur is burned in air to make sulfur dioxide gas:
S(l)  +  O2(g)     SO2(g)


Stage 2
Sulphur dioxide is converted to sulfur trioxide:

2 SO2(g)  +  O2(g)     2 SO3(g)
A catalyst (vanadium(V) oxide) is used here to speed up the reaction. 

Stage 3
The sulfur trioxide gas is then absorbed into very concentrated sulfuric acid to produce a thick fuming liquid called oleum. 

Stage 4

The oleum is mixed carefully with water, and the sulfur trioxide in the oleum reacts with the water as follows:
SO3(g)  +  H2O(l)     H2SO4(l)

NOTE

Sulfur trioxide is not mixed directly with pure water because the reaction is highly exothermic, which would produce a fine mist of sulfuric acid that could escape to pollute the air is because it is difficult to condense.

Answer 2

Answer:

The acidic oxide from which sulphuric acid is obtained is called sulphur dioxide (SO2), but it is first converted to sulphur trioxide (another acidic oxide)