Bone ash contains
1). Calcium sulphate
2). Phosphoric sulphate
3). Calcium phosphate
4). Calcium hypophosphate
1. When conc. H2SO4 is added to dry KNO3, brown fumes are evolved. These fumes are due to
2. Which one among the following?substances is NOT a 'green house' gas ?
5. Detergents used for cleaning clothes and utensils contain
6. German silver an alloy does not contain the metal
7. Question 14.1:Define environmental chemistry.
8. Photo chemical smog is a resultant of the reaction among
9. Which of the following is used to denature ethanol
10. When we see an object,the image formed on the retinal is