Though oxygen is a supporter of combustion and hydrogen is combustible, water - a compound of hydrogen and oxygen - is neither combustible nor supports combustion. Which of these correctly suggests why?
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The constituents of a compound negate each other's properties
The properties of a compound differ from the properties of its constituents
Water is a mixture having 2 parts of hydrogen for every part of oxygen
Water is not at all effective in fighting petrol and some other fires.
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Answer: When two elements combine to form a compound, the properties of the compound formed are different from the properties of parent elements. Therefore, though hydrogen is combustible & oxygen helps combustion, the water helps to extinguish the fire.
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