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प्रश्न
Give reason for the following:
When concentrated sulphuric acid is added to sugar/glucose, a black mass is left behind.
उत्तर
The carbohydrates contain carbon, hydrogen and oxygen. The hydrogen and oxygen are always in ratio of 2:1 which is absorbed by acid in the form of water, thus leaving carbon behind. This is also called as charring.
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संबंधित प्रश्न
In the contact process for the manufacture of sulphuric acid give the equations for the conversion of sulphur trioxide to sulphuric acid.
Distinguish between the given pairs of compounds using the test given within brackets:
Sodium nitrate and sodium sulphite (using dilute sulphuric acid).
Give a chemical test to distinguish between dilute sulphuric acid and conc. sulphuric acid.
Give examples of the use of sulphuric acid as
Non-volatile acid
Write balanced equation for the reaction of dilute sulphuric acid with the following:
Zinc hydroxide
Write the equation for the laboratory preparation of the following salts, using sulphuric acid.
Iron (II) sulphate from iron.
Give a balanced chemical equation for the action of sulphuric acid of the following:
Sulphur
Identify the salts P and Q from the observation given below:
On performing the flame test salt P produces a lilac coloured flame and its solution gives a white precipitate with silver nitrate solution. Which is soluble in ammonium hydroxide solution.
The salt is formed when concentrated sulphuric acid reacts with KNO3 above 200°C.
What property of Sulphuric acid is exhibited in the following case?
When concentrated Sulphuric acid reacts with Copper to produce Sulphur dioxide gas.
