Previous Year Questions - Surface Chemistry (IIT - JEE Advanced) JEE Notes | EduRev

Chemistry for JEE Advanced

JEE : Previous Year Questions - Surface Chemistry (IIT - JEE Advanced) JEE Notes | EduRev

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Q.1 One gm of charcoal absorbs 100 ml 0.5 M CH3COOH to form a monolayer, and there by the molarity of CH3COOH reduces to 0.49. Calculate the surface area of the charcoal adsorbed by each molecule of acetic acid. Surface area of charcoal = 3.01 × 102 m2/gm    [JEE’ 2003]

 

Ans. 5 × 10–19 m2


Q.2 20% surface sites have adsorbed N2. On heating N2 gas evolved from sites and were collected at 0.001 atm and 298 K in a container or volume is 2.46 cm3. Density of surface sites is 6.023 × 1014/cm2 and surface area is 1000 cm2, find out the no. of surface sites occupied per molecule of N2. [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 m2 can be expressed in scientific notation as y × 10x. The value of x is –     [JEE 2010]

 

Ans. 0007

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