During an allergic reaction, the binding of antigens to IgE antibodiess initiates a response, in which chemicals cause the dilation of blood vessels and a host of other physiological changes. Such chemicals are

During an allergic reaction, the binding of antigens to lgE antibodies initiates a response, in which chemical dilation of blood vessels and a number of other physiological changes. Such chemicals are called

Name the antibody responsible for allergic reaction.Also mention two chemicals released during allergic response.

No chemical reaction takes place when granules of a rusty brown solid A re mixed with the powder of another solid B. however, when the mixture is heated, a reaction takes place between its components. One of the products C is a metal and settles down in the molten state while the other product D floats over it. it was observed that the reaction is highly exothermic. (a) What could the solids A and B be? (b) What are the products C and D most likely to be? (c) Write the chemical equation for the reaction between A and B leading to the formation of C and D. Mention the physical states of all the reactants and products in this equation and indicate tthe heat change which takes place. (d) What is the special name of such a reaction? State one use of such a reaction. (e) Name any two types of chemical reaction under which the above reaction can be classified.