Why Teichoic acid present only in gram positive bacteria and not gram negative bacteria?
Why is :
(a) concentrated sulphuric acid kept in air tight bottles ?
(b) H2SO4 is not used as a drying agent for H2S ?
(c) sulphuric acid used in the preparation of HCI and HNO3 ? Give equations in both cases.
Explain the role of moisture present in air. [3 MARKS]