The test for hydrogen is
Salam Academy Original Practice · Proposed mark scheme
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12 questions
Carbon dioxide turns limewater
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A compound gives a yellow flame. It contains
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Oxygen
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Adding sodium hydroxide to a solution gives a red-brown precipitate. The ion present is
Salam Academy Original Practice · Proposed mark scheme
Acidified silver nitrate gives a yellow precipitate with
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The test for sulfate ions uses
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A gas turns damp red litmus paper blue. It is
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A white precipitate with NaOH that dissolves in excess NaOH shows
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Nitric acid, not hydrochloric acid, is added before silver nitrate because
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A blue-green flame and a light blue precipitate with NaOH indicate
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A white solid fizzes with dilute acid producing a gas that turns limewater milky. It gives an orange-red flame. The solid is
Salam Academy Original Practice · Proposed mark scheme