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Q. Show the chemical properties of Aluminium?
Aluminium has a very high affinity for oxygen; this is reflected in high exothermic heat of formation of Al203 (-1676 kJ mol-1). This allows aluminium to extract oxygen from other metal oxides, and forms the basis of Goldschmidt's aluminothermic process for Ca, Sr, Ba, Mn, Cr, Mo, etc:
3Mn02 + 4Al --------------------------------->+ 2AI2, 03 + 3Mn
Fe203 + 2Al --------------------------------->Al2, O3, + 2Fe (l)
Calculate the ratio of d number of molecules in two energy levels at 27''c given E2=9.75x10"-13erg/mol E1=6.95X10"-13erg/mol g1=2 g2=3
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If 4.5 grams of Nitrogen reacted with 2.6 grams of Hydrogen, identify the following: Limiting Reactant- Excess Reactant- and Theoretical Yield:
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An e - has magnetic quantum number as 3, what is its principal quantum number: (1) 1 (2) 2 (3) 3 (4) 4 Ans: 4
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