1.

The number of molecules in 4.25 g of ammonia is approximately                                                 [CBSE PMT 2002]

A.                 \[0.5\times {{10}^{23}}\]
B.             \[1.5\times {{10}^{23}}\]
C.                 \[3.5\times {{10}^{23}}\]
D.                 \[2.5\times {{10}^{23}}\]
Answer» C.                 \[3.5\times {{10}^{23}}\]


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