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Final answer:Hydrogen gas emits four spectral lines in the visible spectrum when heated: red, aqua, blue, and violet. These lines are a result of the excitation and subsequent photon release of hydrogen atoms.Explanation:A hot hydrogen gas emits discrete energies in the form of spectral lines in the visible spectrum, rather than continuous spectrum (like a rainbow). Hydrogen's emission spectrum is particularly unique and identifiable. As the gas is heated, the hydrogen atoms are excited and they emit light of specific wavelengths. The visible part of hydrogen's emission spectrum consists of four lines: red (656 nm), aqua (486 nm), blue (434 nm), and violet (410 nm). This emission is a result of an electric discharge passing through the hydrogen gas, causing molecules to break apart into separate H atoms, which subsequently release photons of these four visible wavelengths.Learn more aboutHydrogen Gas Emissionhere:brainly.com/question/32823773#SPJ11...