What is the atomic number of Oxygen?
A). 5
B). 8
C). 12
D). 22
1. In upper layer of atmosphere ozone is formed
3. Which of the following gases will effuse out of football bladder most quickly ?
4. Silver nitrate solution is kept in brown bottles in laboratory because
5. Question 15.5:Define the term polymerisation.
6. An inert gas mixed with oxygen given to patients suffering from restricted breathing is
7. Which of the following could act as properllant for rockets-
8. The material used in solar cells contains
9. Thermal electricity is generated by using which of these ?
10. Which of the following is used to remove ink and rust stains on cloth?