Carnotite is an ore/mineral of _______.
1). Beryllium
2). Chromium
3). Uranium
4). Copper
1. The metal chiefly used for galvanising iron is
2. Which of the following could be used as fuel in propellant or rockets ?
3. The ionic radii of N3-, O2-, F- and Na+ follows the order
4. A balloon filled with helium rises in air because
6. The substance most commonly used as a food preservative is
7. Cod liver is an example of -
9. Ozone depletion in the atmosphere is mainly caused by
10. In which of the following substances all carbon atoms are quaternary in nature ?