Surface Chemistry & Solid State · JEE Main previous year questions

2012 4 questions

1. Q872012 · 26 May 2012 · Shift 1

   Colloidal solutions can be purified by

   1. A.emulsification
   2. B.electrodialysis
   3. C.peptization
   4. D.using Tyndall effect
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   Answer: B

2. Q862012 · 12 May 2012 · Shift 1

   The radius of a calcium ion is $94\mathrm{pm}$ and of the oxide ion is $146\mathrm{pm}$. The possible crystal structure of calcium oxide will be

   1. A.tetrahedral
   2. B.trigonal
   3. C.octahedral
   4. D.pyramidal
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   Answer: C

3. Q872012 · 7 May 2012 · Shift 1

   A solid has a 'bcc' structure. If the distance of nearest approach between two atoms is $1.73\mathring{\mathrm{A}}$, the edge length of the cell is

   1. A.$314.20\mathrm{pm}$
   2. B.$1.41\mathrm{pm}$
   3. C.$200\mathrm{pm}$
   4. D.$216\mathrm{pm}$
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   Answer: C

4. Q882012 · 7 May 2012 · Shift 1

   If $x$ is the mass of the gas adsorbed on mass $m$ of the adsorbent at pressure $p$, Freundlich adsorption isotherm gives a straight line on plotting

   1. A.$x/m\mathrm{vs}p$
   2. B.$x/m\mathrm{vs}1/p$
   3. C.$\log x/m\mathrm{vs}\log p$
   4. D.$\log x/m\mathrm{vs}p$
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   Answer: C