The type of glass used in making lenses and prisms is
A). Jena glass
B). Soft glass
C). Pyrex glass
D). Flint glass
1. One of the constituents of tear gas is
3. The chiefsource for the production of nitrogeneous fertilizers is :
4. The energy of the sun is mainly due to
5. Which one of the following binds with hemoglobin irreversibly?
7. Among the various allotrope of carbon