2. Which element has the highest electronegativity?
3. What gas is the main cause of rise in temperature in the atmosphere?
[C]Carbon - dioxide
4. Glass is made of the mixture of _________________________.
[A]Salt and Silicates
[B]Sand and Silicates
[C]Mica and Quartz
[D]Silicates and Mica
5. Which of the following is used as a moderator in human reactor?