The cummulative mass fraction of particles smaller than size dj for a collection

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Question
The cummulative mass fraction of particles smaller than size d_j for a collection of N_i particles of diameter d_i and mass mi (i = 1, 2, 3, ...... ?) is given by
Options
A. $The cummulative mass fraction of particles smaller than size dj for a collection of Ni particles of$
B. $The cummulative mass fraction of particles smaller than size dj for a collection of Ni particles of$
C. $The cummulative mass fraction of particles smaller than size dj for a collection of Ni particles of$
D. $The cummulative mass fraction of particles smaller than size dj for a collection of Ni particles of$

Correct Answer

1. Pick out the correct statement.
Options
A. Deforestation helps in controlling the green house effect.
B. Global warming is detrimental for increase in food productivity and may cause flood and cyclone.
C. Lightening discharges are natural source of production of SO₂ & H₂S pollutant.
D. Sulhur dioxide causes death by asphyxiation.

3. The boiling points for pure water and pure toluene are 100�C and 110.6�C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. If, at a total pressure of one standard atm. exerted by the vapours of water and toluene, the mole fraction of water X^w in the vapour phase satisfies
Options
A. 0 < X_w < 0.5
B. X_w = 0.5
C. 0.5 < X_w < 1.0
D. X_w = 1.0

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