1. An element crystallizes in fcc lattice having edge length 400 pm. Calculate the maximum diameter of atom which can be placed in interstitial site without distorting the structure.
2. Predict whether the following molecules are iso-structural or not. Justify your answer.
(i) NMe3
(ii) N(SiMe3)3
3. Write balanced chemical equation for developing a black and white photographic film.
4. give reason why the solution of sodium thiosulphate on acidification turns milky white and give balance equation of this reaction.
5. 2X(g) → 3Y(g) + 2Z(g)
Time in minutes-----------------0------100-----200
Partial Pressure of X----------800-----400-----200
(in mm of Hg)
Assuming ideal gas condition calculate
1. Order of reaction
2. rate constant
3.Time taken for 75% completion
4. Total pressure when PP of X is 700 mm.
Source Main 2006
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