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21
Which of the following is also used as a lubricant?
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Answer: Option B
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22
The maximum valency of halogen group with respect to oxygen is . . . . . . . .
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Answer: Option B
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23
What is the chemical formula of phosphoric acid?
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Answer: Option B
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24
What are the elements related to group 17?
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Answer: Option C
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25
Heavy water' is a term related to which of the following?
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Answer: Option C
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26
Which one of the following pairs is incorrectly matched?
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Answer: Option D
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27
The foul smell of dead fish is due to the compound
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Answer: Option A
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28
. . . . . . . . is an example of monoatomic molecule.
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Answer: Option A
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29
Which of the following elements is polyatomic molecules?
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Answer: Option C
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30
Which of the following gases has the highest energy value (calorific value)?
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Answer: Option A
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