Study of Compounds – Sulphuric Acid Quiz - ICSE Class 10 Chemistry
Free practice quiz: Study of Compounds – Sulphuric Acid (ICSE Class 10 Chemistry). 41 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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Which of the following is NOT a characteristic property of concentrated sulphuric acid?
- Dehydrating agent
- Oxidizing agent
- Non-volatile acid
- Reducing agent
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Answer: D. Reducing agent
Concentrated sulfuric acid is a strong oxidizing agent and a dehydrating agent. It is also a non-volatile acid. It is not a reducing agent; in fact, it readily oxidizes many substances, acting as an oxidizing agent itself.
In the Contact Process, the reaction of sulfur dioxide with oxygen to form sulfur trioxide is reversible and exothermic. To maximize the yield of sulfur trioxide, which of the following conditions should be favored?
- High temperature, low pressure
- Low temperature, high pressure
- High temperature, high pressure
- Low temperature, low pressure
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Answer: B. Low temperature, high pressure
The reaction 2SO₂ + O₂ ⇌ 2SO₃ is exothermic (releases heat). According to Le Chatelier's principle, lower temperatures favor the forward (exothermic) reaction, thus increasing the yield of SO₃. The forward reaction also involves a decrease in the number of moles of gas (3 moles of reactants to 2 moles of product). Higher pressure favors the reaction that reduces the number of moles of gas, thus increasing the yield of SO₃. However, a compromise temperature (around 400-450°C) is used to achieve a reasonable rate of reaction, as lower temperatures result in very slow reaction rates.
The primary use of sulfuric acid in the petroleum industry is:
- As a catalyst in cracking
- To remove impurities like unsaturated hydrocarbons
- To prevent corrosion of pipelines
- To produce lubricating oils
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Answer: B. To remove impurities like unsaturated hydrocarbons
In the petroleum industry, concentrated sulfuric acid is used to remove impurities, particularly unsaturated hydrocarbons (alkenes and alkynes), from gasoline and other refined products. These impurities react with sulfuric acid and are removed as oily sludge.
Which of the following metals is NOT oxidized by dilute sulfuric acid?
- Zinc
- Iron
- Copper
- Magnesium
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Answer: C. Copper
Dilute sulfuric acid, like other dilute non-oxidizing acids, reacts with metals that are more reactive than hydrogen in the electrochemical series to produce hydrogen gas and the corresponding metal sulfate. Zinc, iron, and magnesium are more reactive than hydrogen and will react. Copper is less reactive than hydrogen, so it does not react with dilute sulfuric acid. Copper reacts with concentrated sulfuric acid due to its oxidizing nature.
When concentrated sulfuric acid is heated with sulphur, the product formed is:
- SO₂
- SO₃
- H₂S₂O₇
- H₂S
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Answer: A. SO₂
When sulfur is heated with concentrated sulfuric acid, the sulfuric acid acts as an oxidizing agent, oxidizing sulfur to sulfur dioxide. The reaction is: S + 2H₂SO₄ (conc.) → 3SO₂ + 2H₂O. SO₃ is not formed under these conditions; it's a product of oxidation of SO₂. H₂S₂O₇ is oleum, formed from SO₃ and H₂SO₄. H₂S is a reducing agent.