Why is hydrogen filled in weather balloons rather than helium in many cases?
AHydrogen does not catch fire under any condition
BHelium is heavier than air, so it sinks rapidly
CHydrogen is much cheaper than helium and lifts more
DHelium gives a brighter colour to the balloon
Answer & Solution
Correct answer: C. Hydrogen is much cheaper than helium and lifts more
1. Hydrogen is cheap and very light, giving good lift.
2. Helium is much costlier and slightly heavier than hydrogen.
3. So hydrogen is often preferred when fire risk is acceptable.
4. Hence option A is correct.
_Source: Selina Concise Chemistry Class 8, Ch on Hydrogen (Mistral OCR'd PDF), section on uses of hydrogen_
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