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chromotographic method explain
1.sheilding & de-sheilding 2.magnetic anisotropy 3.hydrogen bonding
Q. Reactions with metals? Ans. Halogens commonly undergo reactions with metals. Halogens react with the alkali metal family, Group IA in the periodic table. For example,
A sample of gas occupies 10l under a pressure of 1atm. what will be its volume if the pressure is increased to 2atm ? assuming that temperature of the gas sample does not change
the simplest forms of physical quantities
The number of electrons in the valence shell of calcium is: (1) 6 (2) 8 (3) 2 (4)4 Ans: 2
The number of unpaired electrons in carbon atom in excited state is: (1) One (2) Two (3) Three (4) Four Ans: Four
how many times does water need to be magnified to see the atoms
The electronic configuration of calcium ion ( Ca2 + ) is: (1) 1s 1 , 2s 2, 2p 6 , 3s 2 , 3p 6 , 4s 2 (2) 1s 1 , 2s 2 , sp 6 , 3s 2 , 3p 6 , 4s 1
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