Ncert Exercises & Solutions

Question 12.32:
An organic compound contains 69% carbon and 4.8% hydrogen, the remainder being
oxygen. Calculate the masses of carbon dioxide and water produced when 0.20 g of this
substance is subjected to complete combustion.

Although the addition of sulphuric acid will precipitate lead sulphate, the addition of acetic
acid will ensure a complete precipitation of sulphur in the form of lead sulphate due to
common ion effect. Hence, it is necessary to use acetic acid for acidification of sodium
extract for testing sulphur by lead acetate test.

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