Helium is often used in observation balloons because it i...
Helium is often used in observation balloons because it is?
light and combustible
light and non-combustible
heavy and combustible
heavy and non-combustible
Correct answer is B
No explanation has been provided for this answer.
Which of the following statements is not true of tin? it ...
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Dehydration of ethanol produces ...
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The role of sodium chloride in the preparation of soap is to? ...