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If the velocity of hydrogen molecule is 5x 10 4 cm sec-1 then its de-Broglie wavelength is:
(1) 2 Å
(2) 4 Å
(3) 8 Å
(4)100 Å
Ans: 4 Å
Name the chemical components which constitute nucleotides. Write any two functions of nucleotides in a cell.
An element has the electronic configuration 1s 2 , 2s 2, 2p 6 , 3s 2 , 3p 2 . Its valency electrons are: (1) 6 (2) 2 (3) 3 (4)4 Ans: 4
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