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a
By adding water in H2SO4
b
By adding H2SO4 in water
c
By adding glacial acetic acid in H2SO4
d
None of the above
answer is B.
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Detailed Solution
Concentrated H2SO4 s diluted by adding the conc. H2SO4 in the water drop by drop with constant stirring because it is an exothermic reaction and by doing so heat is generated slowly and dissipiated in the atmosphere.