Atomic number of which of the following elements is greater than that of Iron?
1). Manganese
2). Cobalt
3). Calcium
4). Chromium
1. The gas liberated in the Bhopal gas tragedy was:
2. Depletion of ozone layer causes
3. Which one of the following is a major greenhouse gas?
4. Tear gas used by the police to disperse the mob contains
5. Which one of the following is most acidic?
6. Nucleus of an atom consists of
7. Which of the following is a monoatomic gas?
8. Which type of radiations are absorbed by the upper layer of the atmosphere
9. The main constituent of biogas is
10. Silver halides are used in photographic plates because they are