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Question
Give a chemical test to distinguish between dilute sulphuric acid and conc. sulphuric acid.
Solution
- Dilute sulphuric acid treated with zinc gives hydrogen gas, which burns with a pop sound. Concentrated \[\ce{H2SO4}\] gives \[\ce{SO2}\] gas with zinc, and the gas turns acidified potassium dichromate paper green.
- Barium chloride solution gives white ppt. with dilute \[\ce{H2SO4}\]. This white ppt. is insoluble in all acids.Concentrated \[\ce{H2SO4}\] and \[\ce{NaCl}\] mixture when heated gives dense white fumes if a glass rod dipped in ammonia solution is brought near it.
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