The biogas used for cooking is a mixture of which of the following ?
1). Carbon dioxide & oxygen
2). Isobutane & propane
3). Methane & carbon monoxide
4). Methane & carbon dioxide
3. 'Plaster of Paris' is made by partial dehydration of
4. Glycol is used to manufacture which of the following ?
5. Bauxite is an alloy of which of the following metals
6. Quartz is a crystalline form of
7. The term 'Carbon foot print' means
8. A colloidal system in which a liquid is dispersed in a liquid is called