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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.
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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
Identify the acid in the following case:
The acid which produces sugar charcoal from sugar.
Give balanced chemical equations for the action of sulphuric acid on the following:
Potassium hydrogen carbonate.
Give balanced chemical equations for the action of sulphuric acid on the following:
Sulphur
Give one equation to show the following properties of sulphuric acid:
As a non-volatile acid
Give two balanced reactions of the type to show the following property of sulphuric acid:
Oxidising agent
Give main difference between drying agent and dehydrating agent.
What would you observe in the following case:
Sugar crystals are added to a hard glass test tube containing concentrated sulphuric acid.
Give one equation to show the following property of sulphuric acid:
Acidic nature
Give two balanced reactions of the type to show the following property of sulphuric acid:
Dehydrating nature
The salt is formed when concentrated sulphuric acid reacts with KNO3 above 200°C.
