The correct answer is (c) aluminum.
Aluminum is a metal that reacts with both hydrochloric acid and sodium hydroxide solutions to produce hydrogen gas.
Here’s why: with hydrochloric acid.
2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g) with sodium hydroxide solution.
2Al(s) + 2NaOH(aq) + 2H2O(l) → 2NaAlO2(aq) + 3H2(g)
Explanation of why other options are incorrect:
Copper (a):
Copper is not a reactive metal and does not react with dilute hydrochloric acid to produce hydrogen gas.
Iron (b):
While iron does react with dilute hydrochloric acid to produce hydrogen gas, it does not react with sodium hydroxide solution to produce hydrogen gas.
Sodium (d):
Sodium reacts violently with water, but it also reacts with dilute hydrochloric acid to produce hydrogen gas. However, sodium hydroxide is a strong base and does not react with sodium to produce hydrogen gas.