Hydrogen sulphide burns in air to …
What is the focus on which the light rays appear to diverge or converge in terms of lens when they move parallel to principal axis? is it F1 or F2?
Posted by Alisha Kushwah 1 day, 23 hours ago
- 3 answers
Why are there so many valency for the element manganese? I searched online and it shows 2,4,7 how?? Can someone tell me one valency I can use for manganese
Posted by Ridhi Aswal 22 hours ago
- 0 answers