Page 434 - SUBSEC October 2017_Neat

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28. Which of the following equations 30. A solution of 5g of an organic compound X
3
governs the determination of an unknown in 200 cm of water is shaken with 100 cm3
compound, X, in a solution by UV/VIS of choloroform. 1.3g of the acid remain in
spectroscopy? the aqueous solution at equilibrium. The
partition coefficient of X between water
(A) log (I /I) = ∈ = c L and chloroform is
10 o

(B) log (I/I ) = ∈ = c L (A) 3.7
10 o
6.5
(C) log (I /I) = ∈c
10 o L (B) 3.7 X 10 -2
6.5 X 10 -3
(D) log (I/I ) = ∈c
10
o
L (C) 6.5
3.7

29. Whcih of the following are all examples -2
of commonly used stationary phases in (D) 6.5 X 10
chromatography? 3.7 X 10 -2

(A) Cellolose, alumina, starch
(B) Silica gel, alumina, cellulose 31. In the conversion of bauxite to pure
(C) Silica gel, cellulose, sodium aluminium oxide, what is the compound
chloride obtained after filtering and adding carbon
(D) Alumina, silica gel, aluminium dioxide to the impure bauxite?
chloride
(A) A1(OH)
3
(B) A1(OH) 4 -

(C) SiO 2-
3
(D) A1 (CO )
2
3 3

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