All isotopes of the same element have ________
A). Different atomic numbers and different atomic mass
B). Different atomic numbers and the same atomic mass
C). The same atomic number but different atomic masses
D). The same atomic number and the atomic mass
The same atomic number but different atomic masses
All isotopes of the same element have the same atomic number but different atomic masses.
2. The metal present in vitamin B12 is
4. Basicity of boric acid, H3BO3 is
7. Which among the following coal contains 90 per cent of carbon?
8. Which of the process is known as nitrification?
9. If the sewage is fully oxidized, the nitrogen is in the form of
10. In chemical terms, what are alums used for purifying water for drinking purposes ?