Surface Chemistry & Solid State · JEE Main previous year questions

2005 2 questions

1. Q2152005 · 28 Apr 2005 · Shift 1

   The volume of a colloidal particle, $V_{\mathrm{C}}$ as compared to the volume of a solute particle in a true solution $V_{\mathrm{S}}$, could be

   1. A.$\frac{V_{\mathrm{C}}}{V_{\mathrm{S}}}\simeq 1$
   2. B.$\frac{V_{\mathrm{C}}}{V_{\mathrm{S}}}\simeq 10^{-3}$
   3. C.$\frac{V_{\mathrm{C}}}{V_{\mathrm{S}}}\simeq 10^3$
   4. D.$\frac{V_{\mathrm{C}}}{V_{\mathrm{S}}}\simeq 10^{23}$
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   Answer: C

2. Q2162005 · 28 Apr 2005 · Shift 1

   The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively, which of the following statements is NOT correct?

   1. A.magnesium chloride solution coagulates, the gold sol more readily than the iron (III) hydroxide sol.
   2. B.sodium sulphate solution causes coagulation in both sols
   3. C.mixing the sols has no effect
   4. D.coagulation in both sols can be brought about by electrophoresis
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   Answer: C