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The wave nature of an electron was first given by:
(1) De-Broglie
(2)Heisenberg
(3)Mosley
(4)Sommerfield
Ans: De-Broglie
why standard enthalpy change of Br2(g) is not zero
The number of orbitals in d sub-shell is : (1) 1 (2) 3 (3) 5 (4) 7 Ans: 5
What r the requirements for a good refractory material
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Number of nodal centres for 2s orbital: (1) 1 (2) 0 (3) 4 (4) 3 Ans: 1
why Px orbitol reside outside in bonding orbitol in elements have Z>7
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What are photochemical reactions? Explain the mechanism of the photo- chemical reaction occurring among hydrogen and chlorine gas.
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