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  • Question 1
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    When the air temperature is below freezing, the saturation vapor pressure over water is _______.

  • Question 2
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    A sample of pure Cu $$(3.18\,g)$$ when heated in the presence of oxygen forms a black oxide of copper $$(CuO)$$. The final weight of CuO is $$3.92$$g. The percent of Cu oxidised is

  • Question 3
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    In a mixture of $$A$$ and $$B$$, having vapour pressure of pure $$A$$ and pure $$B$$ as $$400mm\, Hg$$ and $$600mm\, Hg$$ respectively, mole fraction of $$B$$ in liquid phases is $$0.5$$. Calculate total vapour pressure and mole fraction of $$A$$ and $$B$$ in vapour phases.

  • Question 4
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    How many types of solutions are possible by the combination of any two of three states of matter (solid, liquid, and gas)

  • Question 5
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    One mol of a solute A is dissolved in a given volume of a solvent. The association of the solute take place according to $$n A = (A)_n$$. The van't Hoff factor i is expressed as

  • Question 6
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    Directions For Questions

    Vitamin $$C(M=176)$$ is a compound of $$C, H$$ and $$O$$ found in many natural sources, especially citrus fruits. When a $$1.0\ g$$ sample of vitamin $$C$$ is placed a combustion chamber and nurned, the following data are obtained:
    Mass of $$CO_{2}$$ absorber after combustion $$=85.35\ g$$
    Mass of $$CO_{2}$$ absorber after combustion $$=83.85\ g$$
    Mass of $$H_{2}O$$ absorber after combustion $$=37.96\ g$$
    Mass of $$H_{2}O$$ absorber after combustion $$=37.55\ g$$

    ...view full instructions

    What is the percentage of hydrogen by wt.in vitamin $$C$$ ?

  • Question 7
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    Directions For Questions

    Figure shows a scheme, for concentrating an dilute solution of $$NaOH$$

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    How much water is evaporated per hour?

  • Question 8
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    Calculate van't Hoff factor for $$0.2\ m$$ aqueous solution of $$KCl$$ which freezes at $$-0.680^o$$C. ($$K_f=1.86$$ K kg $$mol^{-1}$$)

  • Question 9
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    A $$1.50\ g$$ sample of type metal (an alloy of $$Sn, pb, Cu$$ and $$Sb$$) is dissolved in nitric acis and metastannic acid, $$H_2SnO_3$$, prpitates. This is delydrated by heating to tin $$(IV)$$ oxide, which is found to weight $$0.50\ g$$. What percentage of tin was in the original type metal sample? $$(Sn=119)$$

  • Question 10
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    Directions For Questions

    When the Bayer's process is used for recovering aluminium from siliceous ores, some aluminium is always lost because of the formation of an unworkable mud having the following average formula: $$3Na_{2}O.3Al_{2}O_{3}.5SiO_{2}.5H_{2}O$$. Since aluminium and sodium ions are always in excess in the solution from which this precipitate is formed, the precipitate of the silicon in the mud is complete. A certain ore contains $$13\%$$ (by weight) Kaolin, $$Al_{2}O_{3}.2SiO_{2}.2H_{2}O$$ and $$87\%$$ gibbsite, $$Al_{2}O_{3}.3H_{2}O$$. $$(Al=27, Si=28)$$

    ...view full instructions

    What is the percentage of silica present in the ore, by weight?

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