A) \[N{{a}^{+}}\] is present outside the cell while \[{{K}^{+}}\] is present inside the cell
B) \[N{{a}^{+}}\] is present inside the cell while \[{{K}^{+}}\] is present outside the cell
C) \[C{{a}^{2+}}\] is present as apatite in teeth
D) \[M{{g}^{2+}}\] is an essential constituent found in leaf of plants
Correct Answer: B
Solution :
\[C{{a}^{2\,+}}\] is present in teeth as apatite \[{{\operatorname{Ca}}_{3}}{{\left( P{{O}_{4}} \right)}_{2}}\]. Magnesium is present in plant as chlorophyll. \[{{K}^{+}}\]is present inside the cell and \[N{{a}^{+}}\] is present outside the cell.
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