Which mixture will not yield hydrogen gas?
A. Sodium and water
B. Calcium and water
C. Zinc and hydrochloric acid
D. Zinc and concentrated nitric acid
E. Steam and red hot iron
Answer (2)
Among the provided options, only the reaction between zinc and concentrated nitric acid will not produce hydrogen gas. Instead, it produces nitrogen oxides. ;
The mixture that will not yield hydrogen gas is the combination of zinc and concentrated nitric acid (option D), as it produces nitrogen oxides instead. Other options either directly produce hydrogen gas or involve reactions that do produce it. Thus, the answer is D.
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