1.

Number of atoms in 69 g of Na is :

A. \[1.0\times {{10}^{24}}\] atoms of Na
B. \[1.80\times {{10}^{24}}\] atoms of Na
C. 1 and 3 only  
D. \[1.5\times {{10}^{23}}\] atoms of Na
E. None of these
Answer» C. 1 and 3 only  


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