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18-09-2020
Biology

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Blimps were once filled with hydrogen, but now helium is used
instead. Why is helium a better choice than hydrogen?
a Hydrogen is no longer available in pure form.
b Helium is cheaper than hydrogen.
C Hydrogen is flammable, while helium is not.
d Helium is lighter than hydrogen.

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18-09-2020

Answer:

C.

Explanation:

Hydrogen's pure form is gas at room temperature. Helium is expensive. Hydrogen is lighter than helium.

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