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The diffraction of x-ray by a crystal gives 1st order ref at 14•12'' if lattice dist is 3.14 A• wht is the wavelength of x-ray
Q. Illustrate the Quantum Mechanics? Ans: In 1924, a French scientist named Louis de Broglie proposed another model for the nature of the electrons in atoms. He predicted tha
What are distinguishing characteristics of metallic bonding? Metallic state can be visualized like an array of positive ions, with a common pool of electrons to
The number of radial nodes of 3s and 2p orbitals are respectively : (1) 2, 0 (2) 0, 2 (3) 1, 2 (4) 2, 1 Ans: 2, 0
Q. Chemical Properties of f-block element? The lanthanides are silvery-white, highly electropositive and reactive metals. They all react slowly with cold water and quickly on h
Bond order is the number of chemical bonds between a pair of atoms. For example, in diatomic nitrogen N≡N the bond order is 3, while in acetylene H-C≡C-H the bond order between the
determine alcohol acidity in oats
Q. What do you mean by Permissible level ? To regulate and enforce safety about the use of these synthetic colours and dyes PFA, 1954 has covered their use in part IV comprisin
The total magnetic quantum numbers for d-orbital is given by: (1) 2 (2) 0, ± 1, ± 2 (3) 0, 1, 2 (4) 5 ans: 5
Ionization energy of group: Why does Ionization energy of group IIA elements decrease from Be to Ra? A. As the atomic size increases from Be to Ra, the attraction between
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