A) \[0.27\overset{o}{\mathop{A}}\,\]
B) \[1.27\overset{o}{\mathop{A}}\,\]
C) \[2.12\overset{o}{\mathop{A}}\,\]
D) \[3.12\overset{o}{\mathop{A}}\,\]
Correct Answer: C
Solution :
Key Idea: Radius of nth orbit of hydrogen atom\[=0.529\,\,{{n}^{2}}\] where n = no. of orbit = 2 \[\therefore \] \[{{r}_{2}}=0.529\times {{(2)}^{2}}=2.116\,\,\overset{o}{\mathop{A}}\,=2.12\,\overset{o}{\mathop{A}}\,\]
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