Question

conducts experiment showing hydrogen gas is released, which acids react with metals​

Answer 1

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The blue litmus solution in test tube 1 turns red whereas there is no change in colour observed in the test tube 2 containing red litmus solution. Acids such as hydrochloric acid (HCl) liberate hydrogen gas when reacted with active metals such as zinc and burns with a pop sound when burning splinter is got near it.