Indicate the pairs of substances in the reaction of which hydrogen is released: a) methanol and sodium; b) hydrochloric acid and zinc; c) sulfuric acid (concentrated) and copper; d) water and sodium; e) sulfuric acid (diluted) and magnesium; f) sodium hydroxide and potassium.
a) Methanol and sodium, b) hydrochloric acid and zinc, d) water and sodium, e) sulfuric acid (diluted) and magnesium.
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