Mineral acids are usually added to commercial hydrogen peroxide to?
A. oxidize it B. decompose it C. minimize its decomposition D. reduce it to water and oxygen Correct Answer: Option C – minimize its decomposition
Commercial bleaching can be carried out using?
A. sulphur (IV) oxide and ammonia B. hydrogen sulphide and chlorine C. chlorine and sulphur (IV) oxide D. ammonia and chlorine Correct Answer: Option C – chlorine and sulphur (IV) oxide
Which of the following gases has a characteristic pungent smell, turns red litmus paper blue and forms dense white fumes with hydrogen chloride gas?
A. N2 B. N2O C. CI2 D. NH3 Correct Answer: Option D – NH3
A piece of filter paper moistened with lead (ll) ethanoate solution turns black when the paper is dropped into a gas likely to be?
A. sulphur (VI) oxide B. hydrogen chloride C. sulphur (VI) oxide D. hydrogen sulphide Correct Answer: Option D – hydrogen sulphide
The highest rate of production of carbon(lV)oxide can be achieved using?
A. 0.05 mol-³ HCI and 5g powdered CaCO3 B. 0.05 mol-³ HCI and 5g lump CaCO3 C. 0.10 mol-³ HCI and 5g powdered CaCO3 D. 0.025 mol-³ HCI and 5g powdered CaCO3 Correct Answer: Option C = 0.10 mol-³ HCI and 5g powdered CaCO3Products
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