A \( NaNO_3\ and\ dil.HNO_3 \)
B \( Dil.HNO_3\ and\ dil.H_2SO_4 \)
C \( NaNO_2\ and\ dil.HCl \)
D \( Conc.HNO_3\ and\ conc.H_2SO_4 \)
Correct Answer: Option D
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