Mole Concept & Stoichiometry · JEE Main previous year questions

2017 3 questions

1. Q682017 · 9 Apr 2017 · Shift 1

   A solution is prepared by mixing 8.5 g of $\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{l}}_2$ and 11.95 g of $\mathrm{CHC}{\mathrm{l}}_3$ . If vapour pressure of $\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{l}}_2$ and $\mathrm{CHC}{\mathrm{l}}_3$ at 298 K are 415 and 200 mmHg respectively, the mole fraction of $\mathrm{CHC}{\mathrm{l}}_3$ in vapour form is : (Molar mass of $\mathrm{Cl}=35.5\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$)

   1. A.$0.162$
   2. B.$0.675$
   3. C.$0.325$
   4. D.$0.486$
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   Answer: C

2. Q762017 · 9 Apr 2017 · Shift 1
   
   1. A.
   2. B.
   3. C.
   4. D.
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   Answer: A

3. Q612017 · 8 Apr 2017 · Shift 1

   Excess of $\mathrm{NaOH}$ (aq) was added to 100 mL of $\mathrm{FeC}{\mathrm{l}}_3$ (aq) resulting into 2.14 g of $\mathrm{Fe}(\mathrm{OH}{)}_3$ . The molarity of $\mathrm{FeC}{\mathrm{l}}_3$ (aq) is : (Given molar mass of $\mathrm{Fe}=56\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$ and molar mass of $\mathrm{Cl}=35.5\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$)

   1. A.$0.2\mathrm{M}$
   2. B.$0.3\mathrm{M}$
   3. C.$0.6\mathrm{M}$
   4. D.$1.8\mathrm{M}$
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   Answer: A