Aldehydes, Ketones & Acids · JEE Main previous year questions

2015 2 questions

1. Q692015 · 4 Apr 2015 · Shift 1

   The vapour pressure of acetone at $20^{\circ }\mathrm{C}$ is $185\mathrm{torr}$. When $1.2\mathrm{g}$ of a non-volatile substance was dissolved in $100\mathrm{g}$ of acetone at $20^{\circ }\mathrm{C}$, its vapour pressure was $183\mathrm{torr}$. The molar mass ($\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$) of the substance is:

   1. A.64
   2. B.128
   3. C.488
   4. D.32
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   Answer: A

2. Q862015 · 4 Apr 2015 · Shift 1

   3 g of activated charcoal was added to 50 mL of acetic acid solution (0.06N) in a flask. After an hour it was filtered and the strength of the filtrate was found to be 0.042 N. The amount of acetic acid adsorbed (per gram of charcoal) is:

   1. A.36 mg
   2. B.42 mg
   3. C.54 mg
   4. D.18 mg
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   Answer: D