Glucose reacts with concentrated sulphuric acid to give a very pure form of carboncalled sugar charcoal.

To answer the question step by step:

1. Glucose is a type of sugar that can react with concentrated sulphuric acid.
2. The reaction between glucose and concentrated sulphuric acid results in the formation of a substance called sugar charcoal.
3. Sugar charcoal is a very pure form of carbon that is produced as a result of this reaction.
4. The reaction involves the decomposition of glucose molecules by the sulphuric acid, leading to the formation of carbon and other byproducts.
5. The carbon produced in this reaction is in the form of sugar charcoal, which is a solid black substance.
6. Sugar charcoal can be further processed and purified to obtain a highly pure form of carbon.
7. This pure carbon can be used for various applications, such as in the production of activated carbon or as a fuel source.

In summary, when glucose reacts with concentrated sulphuric acid, it produces sugar charcoal, which is a very pure form of carbon.