1) when we put litmus paper in an acid it changed in to a) Blue b) green c) red d) black 2) give an example for week acid a) acetic acid b) hydrochloric acid c) Dsodium hydroxide  d) distilled water 3) what is the second name of alkali a) alkaline b) bases c) acid d) neutral 4) what the use for litmus paper a) . b) - c) _ d) / 5) I can differentiate between hydrochloric acid and acetic acid by litmus paper a) yes b) no 6) example for acidic gases a) oxygen b) hydrogen c) helium d) carbondioxide gas 7) the only basic gases a) ammonia b) nitrogen c) hydrogen d) CO² 8) hydrochloric acid a) HCL² b) HCL c) H²CL d) HC²L 9) Sulphate a) SO³ b) SO c) SO⁴ d) SO² 10) sulphite a) SO³ b) SO c) SO⁴ d) SO²

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