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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
Write a balanced chemical equation for the following:
Action of concentrated sulphuric acid on Sulphur.
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:
Acidic nature
Why is concentrated sulphuric acid kept in air tight bottles?
How are the following conversion brought about? Give equation and condition:
Dilute sulphuric acid to hydrogen.
Choose the current answer from the options given below :
When conc. H2SO4 comes in contact with sugar, it becomes black due to
Write balanced equation for the reaction of dilute sulphuric acid with the following:
Copper carbonate
Write the equation for the laboratory preparation of the following salts, using sulphuric acid.
Iron (II) sulphate from iron.
What would you observe in the following case:
Sugar crystals are added to a hard glass test tube containing concentrated sulphuric acid.
State two observations when
A few crystals of KNO3 are heated in a hard glass tube
