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**Q.1 One gm of charcoal absorbs 100 ml 0.5 M CH _{3}COOH to form a monolayer, and there by the molarity of CH_{3}COOH reduces to 0.49. Calculate the surface area of the charcoal adsorbed by each molecule of acetic acid. Surface area of charcoal = 3.01 × 10^{2} m2/gm [JEE’ 2003]**

**Ans. **5 × 10^{–19 }m^{2}

**Q.2 20% surface sites have adsorbed N _{2}. On heating N_{2} gas evolved from sites and were collected at 0.001 atm and 298 K in a container or volume is 2.46 cm^{3}. Density of surface sites is 6.023 × 10^{14}/cm2 and surface area is 1000 cm^{2}, find out the no. of surface sites occupied per molecule of N_{2}. [JEE 2005]**

**Ans. **0002

**Q.3 Assertion : **Micelles are formed by surfactant molecules above the critical miceller concentration (CMC).

**Reason : **The conductivity of a solution having surfactant molecules decreases sharply at the CMC.

**[JEE 2007]**

**Ans. **B

**Q.6 Silver (atomic weight = 108 g mol ^{–1}) has a density of 10.5 g cm^{–3}. The number of silver atoms on a surface of area 10^{–12} m^{2} can be expressed in scientific notation as y × 10^{x}. The value of x is – [JEE 2010]**

**Ans. **0007

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