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Who modified Bohr's theory by introducing elliptical orbits for electron path:
(1) Hund
(2) Thomson
(3) Rutherford
(4) Sommerfield
Ans: Sommerfield
Why liquids rise in the cappilary tube ? Explain.
physical properties of boron?
Number of unpaired electrons in inert gas is: (1) Zero (2) 8 (3) 4 (4) 18 Ans: Zero
The position and velocity of a small particle like electron cannot be simultaneously determined." This statement is: (1) Heisenberg uncertainty principle (2) Principle of
why is filtration in soil and water a slow process and explain the colour change in the filtrate
Among the bonds formed by a chlorine atom with atoms of hydrogen, chlorine, sodium and carbon, the strongest bond is formed between (1) H- cl
jack prepared copper(11) sulphate by adding a metal oxide to the acid. jill prepared sodium chloride by acid/alkali reaction. name the metal oxide and acid jack would use to mak
Explain the Two solids and a solvent - Phase Diagram? The phase diagram in Figure on the next page is for a ternary system of water and two salts with an ion in common. There i
It is Hydrated Potassium Aluminium Sulfate [ KAl(SO4)2·12H2O ].
Q. Extraction of f-block element ? As all the lanthanides occur together in nature, their extraction involves two main steps: (i) separation from one another and (ii) reducti
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