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The atomic number of an element having the valency shell electronic configuration 4s24p6 is:
(1) 35
(2) 36
(3) 37
(4) 38
Ans: 35
If change in energy (ΔE) = 3x 10 -8 j, h= 6.64x 10 -34 j-s and c= 3x 10 8 m/s then wavelength of the light is: (1) 6.36x 10 3 Å (2) 6.36x 10 5 Å
In the early period of development of the chemistry of complexes, a number of theories were put forward in order to explain in a simple manner the formation of a new compound by th
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why halogens are both +R and -I groups?
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given that ksp of MG(OH)2 is 0.000000000089,calculate the solubility of Mg(OH)2 in a solution buffered at pH=9
Fe(atomic number = 26) atom has the electronic arrangement: (1) 2, 8, 8, 8 (2) 2, 8, 16 (3) 2, 8,14, 2 (4) 2, 8, 12, 4 Ans: 2, 8,14, 2
5H is the most stable, and the least stable isotope is 7H
principle and application
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