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31) The inert gas which is substituted for nitrogen in the air used by deep sea divers for Breathing is:
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(D)
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Learn AIR FORCE MCQs with answers [Page 4 of Department 75]
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32) The three elements most needed in common fertilisers are:
Correct Answer - Option
(C)
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33) Matter waves are
Correct Answer - Option
(B)
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34) What are rubies and sapphires chemically known as?
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(B)
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35) Silver gets corroded due to ___ in air.
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(B)
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36) What is the chemical name for 'Baking Soda' -
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(B)
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37) The 'King of Metals' is:
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(A)
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38) The oil in the wick of an oil lamp rises up due to:
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(B)
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39) Which of the following one of the following does not form oxyacid
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(C)
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40) Which of the following one of the following organic compound is used to remove stains of iron compounds
Correct Answer - Option
(D)
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