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31) What are the substances that take part in a reaction called?
Correct Answer - Option
(C)
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32) What type of reaction is respiration?
Correct Answer - Option
(A)
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33) What are liberated when a base is dissolved in water?
Correct Answer - Option
(A)
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34) What is the fourth state of matter?
Correct Answer - Option
(A)
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35) Which of the following is a compound?
Correct Answer - Option
(C)
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36) Which of the following substances does not contain oxygen?
Correct Answer - Option
(A)
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37) What is the pH value of a salt made up of a strong acid and a weak base?
Correct Answer - Option
(B)
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38) Which of the following is neither an element nor a compound?
Correct Answer - Option
(C)
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39) Which scientist discovered the 'Atomic Theory'?
Correct Answer - Option
(A)
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40) What is bleaching powder?
Correct Answer - Option
(B)
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