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When a lit splint is inserted into the mouth of a test tube containing hydrogen gas produced from the reaction between zinc and hydrochloric acid (HCl), a "pop" sound is heard. This sound indicates the presence of hydrogen gas, which is flammable. The reaction is represented by the equation: Zn + 2HCl → ZnCl₂ + H₂. The hydrogen gas ignites, producing the characteristic noise.

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