## Answers

16.4 g HF has (16.4/20)= 0.82 mol of HF.

Now, 200 mL solution contains 0.82 mol HF

So, 1000 mL solution contains [(0.82 /200) * 1000] = 4.1 mol of HF.

Therefore, concentration of the solution is 4.1 M.

So the correct answer is 4.1M (D)

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