In which of the following states maximum iron ore is found
1). FeC03
2). Fe203
3). Fe304
4). FeS2
1. The nuclear particle having no mass and no charge, but only spin is
2. Vulcanization of rubber is carried out by adding
3. Silver halides are used in photographic plates because they are
4. Which of the following gases will effuse out of football bladder most quickly ?
5. Which among the following will be a negative ion?
6. Which among the following is the major cause of acid rain?
7. Which of the following is a monoatomic gas?
9. Normal rainwater is slightly acidic due to the presence of