Monday, September 7, 2009

IIT JEE Chemistry - Revision Set 3

1. Potential difference of the electrical double layer formed in a colloidal sol is called
(a) Zeta potential (b) Nernst potential (c) EMF (d) Brownian potential

2. The nucleidic ratio, 13H to 11H in a sample of water is 8.0×10-8 : 1. Tritium undergoes decay with a half life period of 12.3 years. How many tritium atoms would 10.0 g of such a sample contain 40 years after the original sample is collected.

3. 1 gm of charcoal adsorbs 100 ml 0.5 M CH3COOH to form a monolayer, and thereby 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

4.Hydrogen bonding is maximum in

(a) ethanol (b) Diethylether (c) Ethyl chloride (d)Triethylamine

5. The critical temperature of water is higher than that of O2 because the H2O molecule has
(a) few electrons than O2
(b) two covalent bonds
(c) dipole moment

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