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Science Quiz (for 12 to 16 years old): Quiz 3

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The variety of coal in which the deposit contains recognisable traces of the original plant material is

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The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is

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The property of a substance to absorb moisture from the air on exposure is called

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The gases used in different types of welding would include

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Which of the following is used as a lubricant?

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Tetraethyl lead is used as

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