UPSC  Chemistry

11. A fractionating column is used in

Sublimation distillation fractional distillation Chromatography

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12. The Chromatography technique was developed by

Soxhlet Tswett Victor grignard Liebig

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13. The most satisfactory method for separating sugars is

Fractional distillation Vacuum distillation Chromatography Steam distillation

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14. Azeotropic mixtures

Boil at different temperature Are mixtures of solids Are constant boiling mixtures None of the above

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15. A mixture of camphor and benzoic acid can be easily separated by

Sublimation Fractional distillation Chemical method Extraction -with solvents

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16. Anthracene is purified by

Filtration Distillation Crystallisation Sublimation

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17. An organic compound A(C4H9Cl) on reaction with Na/diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative then, A is:

iso-butyl chloride secondary butyl chloride t-butyl chloride n-butyl chloride

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18. Identify the wrong statement in the following

Atomic radius of the elements increases as one moves down the first group of the periodic table Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius

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19. A catalyst is a substance which

increases the activation energy increases the rate of reaction and increases the equilibrium concentration of products changes the equilibrium of a reaction so that the concentration of the product increases hastens the attainment of equilibrium

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20. atomic number of an element gives

the number of nucleons in its atom the number of electrons in its atom the weight of the atom of the element the total number of elementary particles in its atom

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