31. Phosphorus is kept in water so that . . . . . . . .
32. Phosphorus is kept in water because
33. Which one of the following is not true for diamond?
34. Consider the following statements Laughing gas (N2O)
1. finds use as a propellant for whipped ice-cream.
2. used as an anaesthetic.
3. used for the preparation of N3H.
4. used as fuel for rockets.
Which of the above is/are correct?
1. finds use as a propellant for whipped ice-cream.
2. used as an anaesthetic.
3. used for the preparation of N3H.
4. used as fuel for rockets.
Which of the above is/are correct?
35. Atomicity of phosphorus is-
36. Yellow colour of usual nitric acid is due to the presence of which one of the following?
37. Which of the following is not an allotrope of carbon?
38. Chlorine, fluorine and iodine are examples of known.
39. Electric bulbs typically contain chemically inert gases such as . . . . . . . .
40. Which elements have 7 valence electrons in their outermost shells?
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