The total energy of revolving electron in an atom
1). cannot be negative
2). can have any value above zero
3). can never be positive
4). will always be positive
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2. Sphalerite is an ore/mineral of
3. Silver halides are used in photographic plates because they are
4. Which of the following is not a nitrogenous fetiliser?
5. The Chemical formula of Methanol is _____.
6. Which of the following is a monoatomic gas?
7. Question 7.20:Which aerosols deplete ozone?
8. Which type of fire extinguisher is used for petroleum fire ?