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(i) How would you account for the following:
(a) The transition elements exhibit high enthalpies of atomization.
(b) The 4d and 5d series of the transition metals have more frequent met- al metal bonding in their compounds than do the 3d metals.
(c) There is a greater range of oxidation states among the Actinoids than that in the lanthanoids.
(ii). Write the complete chemical equation for each of the following:
(a) An alkaline solution of KMnO4 reacts with an iodide.
A student attempting to sulfonate styrene (vinyl benzene) obtains a by product that contains neither sulfur nor oxygen atoms. Efforts to nitrate styrene yield identical results. Of
order
The present atomic weight scale is based on: (1) C 12 (2) O 16 (3) H 1 (4)C 13 Ans: C 12
There are 13 electrons in an element whose nucleus comprise 14 neutrons. Obtain atomic number and atomic weight of this element. If atomic weight of the isotope of above element is
Discuss effect of impurity, temperature and alloying on the electricity conductivity of metal. For an ideal crystal with no impurities and imperfections mean free path at 0 K i
The quantum number which specifies the location of an electron as well as energy is : (1) Principal quantum number (2) Azimuthal quantum number (3) Spin quantum number
Name the most basic amino acid a) The most basic amino acid is arginine. It has the highest isoelectric point. b) Glycine is not chiral and therefore it cannot be optically
#ques(a) Given the values below, calculate the concentration of benzoyl peroxide required to prepare polystyrene with a number average molar mass of 400,000 by bulk free radical po
Electronic configuration 1s 2 2s 2 2p 6 3s 2 3p 6 3d 5 4s 1 represents: (1) Ground state (2) Excited state (3) Anionic state (4) All of these Ans: Ground
.
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