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31
Phosphorus is kept in water so that . . . . . . . .
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Answer: Option B
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32
Phosphorus is kept in water because
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Answer: Option B
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33
Which one of the following is not true for diamond?
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Answer: Option D
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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?
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Answer: Option C
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35
Atomicity of phosphorus is-
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Answer: Option B
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36
Yellow colour of usual nitric acid is due to the presence of which one of the following?
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Answer: Option D
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37
Which of the following is not an allotrope of carbon?
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Answer: Option D
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38
Chlorine, fluorine and iodine are examples of known.
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Answer: Option C
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39
Electric bulbs typically contain chemically inert gases such as . . . . . . . .
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Answer: Option A
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40
Which elements have 7 valence electrons in their outermost shells?
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Answer: Option A
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