10.0 dm3 gas cylinder containing mixture of various gases 50cm3 of nitrogen gas is in the mixture what is the concentration of N2 gas in part per billion (ppb).
Correct answer: B. Option B
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation
Students should remember that a billion has 9 zeros so option C and D can be eliminated. Also that 1 dm³ = 1000 cm³ so 10 dm³ = 10,000 cm³ So the correct answer is option B i.e 50/10,000 x 109As it is numerical, it can have only one answer.
This question appeared on the ETEA MDCAT 2017 paper, which you can sit online with every answer explained.
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