Heparin is a substance which prevents clotting of blood. Histamine is an anti-inflammatory substance. Mention the leucocytes that secretes the above said substances. Draw and label its nucleus.

The substance which can accept electrons is a Lewis acid. 'BCl_3, BF_3' and 'BBr_3' are Lewis acids. a. Arrange the above Lewis acids in the increasing,order of their acid strength. b. Give reason for this order of acidic strength, c. The chemistry of boron is different from that of other members of the same group. Mention any two differences and give reason.

Small amounts of phosphoric acid is usually added to hydrogen peroxide to prevent its decomposition ? By which name are these type of substances known ?

Small amounts of phosphoric acid is usually added to hydrogen peroxide to prevent its decomposition Which substance would you add to increase the rate of decomposition of hydrogen peroxide ?