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IIT JEE 2007 Practice : CHEMISTRY - Multiple Answers

Each question has one or more than one correct choices among (a), (b), (c) and (d). Write down all the correct choices in alphabetical order separated by one space each.
For example, if the correct choices are (a), (b) and (d) then simply type in the input box provided:
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Which of the following orbits of hydrogen like species has/have the same radius as that of the first Bohr's orbit of hydrogen atom?

(a) Second orbit of Li 2+
(b) Second orbit of Be 3+
(c) Second orbit of He +
(d) Third orbit of Li 2+


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