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Question
How will you distinguish between dilute hydrochloric acid and dilute sulphuric acid using lead nitrate solution?
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Solution
Sulphuric acid precipitates the insoluble sulphate from lead nitrate solution.
Pb(NO3)2 + H2SO4 
PbSO4 + 2HNO3
Lead nitrate reacts with hydrochloric acid to give a white ppt. of lead chloride.
Pb(NO3)2 + 2HCl PbCl2 + 2HNO3
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