Hydrogen gas is collected over water because it is
ASoluble in water and heavier than air
BInsoluble in water and lighter than air
CSoluble in water and lighter than air
DInsoluble in water and heavier than air
Answer & Solution
Correct answer: B. Insoluble in water and lighter than air
1. Hydrogen is the lightest known gas.
2. It is also very nearly insoluble in water.
3. Water displacement traps it cleanly in an inverted jar.
4. So option A is correct.
_Source: Selina Concise Chemistry Class 8, Ch on Hydrogen (Mistral OCR'd PDF), section on collection of hydrogen_
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