481. Quantum number which tells the energy of electron is________________?
A. n
B. 1
C. m
D. s

482. _______________ can expel proterons from paraffins ?
A. Electron
B. Positron
C. Neutron
D. None of above has such capability

483. Centrifugal forces are balanced in atom by__________________?
A. Attractive forces
B. Repulsive force
C. Electrons
D. Neutrons

484. When 6d orbital is complete the entering electron goes into_________________?
A. 7f
B. 7s
C. 7p
D. 7d

485. Neutrons moving with an energy of 1.2 MeV are called_______________?
A. Fast neutrons
B. Slow neutrons
C. Moderate neutrons
D. All are possible

486. Which of the following way in used for classification of chromatography ?
A. Shape
B. Phase
C. Mechanism
D. All

487. Which of the following technique is used for the separation of insoluble particles from liquids ?
A. Filtration
B. Crystallization
C. Solvent extraction
D. Chromatography

488. Fluted filter paper is used to__________________?
A. Filter hot solution
B. Avoid premature crystallization
C. Increase the rate of filtration
D. Decrease the area

489. A substance having very high vapour pressure at its melting point on heating will show_______________?
A. Melting
B. Sublimation
C. Decomposition
D. Condensation

490. A technique of partition chromatography in which the solvent is in a pool at the bottom of container_______________?
A. Adsorption chromatography
B. Ascending chromatography
C. Radial chromatography
D. Descending chromatography