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6 December, 17:51

All fires require oxygen () There is no oxygen in that room (T).

Therefore, there is no fire in that room.

A. valid, and Sound.

B. valid, and Unsound.

C. invalid and Sound

D. invalid, and Unsound

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Answers (1)
  1. 6 December, 18:57
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    The sentences are invalid and unsound.

    Explanation:

    The fire is defined as the vigorous oxidation of a substance. Now oxidation can occur in presence of any oxidising agent. Like magnesium in presence of nitrogen in high temperature with a dazzling brownish flame to produce magnesium nitride. So fire can be produced in absence of oxygen.

    Oxygen is present everywhere in world. So production of a whole room without oxygen is very tough to produce and costly process. So its very unsound.
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