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Class 10 Chemistry Chapter 19 Test 5 | Nitrogen & Sulphur
Class 10 chemistry chapter 19 Test 5 pdf download
Prepare for the Punjab Board Class 10 Chemistry Examination 2027 with Chapter 19: Nitrogen and Sulphur – Class Test 5. This chapter-wise Chemistry test covers Textbook Topics 19.1 to 19.3 and is designed to help students revise important concepts, assess their understanding, and improve their exam preparation. Based on the new syllabus issued by PECTAA Punjab, this test is part of our Punjab Board 2027 Model Papers and Class 10 Chemistry Chapter-Wise Test Series. Practice this test to strengthen your Chemistry knowledge and prepare effectively for the 10th Class annual examinations in 2027.
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Chapter Wise Class TestT-5Chapter-19Nitrogen and Sulphur
1.1 Choose the correct Answer.(Time: 7 Minutes)(Total Marks: 8)
1.The major use of ammonia is in:
(a) Fuel production(b) Fertilizer production(c) Textile industry(d) Paint industry
Answer: (b) Fertilizer production
2.The ratio of nitrogen to hydrogen in Haber process is:
(a) 1:1(b) 1:2(c) 1:3(d) 2:3
Answer: (c) 1:3 (N2 + 3H2)
3.Nitrogen is obtained industrially by:
(a) Electrolysis of water(b) Fractional distillation of air(c) Heating ammonia(d) Combustion of methane
Answer: (b) Fractional distillation of air
4.Sulphur dioxide (SO2) is prepared by:
(a) Heating limestone(b) Burning sulphur in air(c) Electrolysis of water(d) Cooling air
Answer: (b) Burning sulphur in air (S + O2 → SO2)
5.Which substance is used to dry gases in the drying tower?
(a) Water(b) Dilute acid(c) Concentrated sulphuric acid(d) Sodium hydroxide
Answer: (c) Concentrated sulphuric acid
6.Oleum is:
(a) Dilute sulphuric acid(b) SO2 gas(c) Solution of SO3 in H2SO4(d) Pure water
Answer: (c) Solution of SO3 in H2SO4
7.Which of the following is a basic oxide?
(a) CO2(b) SO2(c) Na2O(d) NO2
Answer: (c) Na2O
8.Amphoteric oxides react with:
(a) Only acids(b) Only bases(c) Both acids and bases(d) Only water
Answer: (c) Both acids and bases
(P.T.O)
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Chapter Wise Class TestT-5Chapter-19Nitrogen and Sulphur
Total Marks: 17(Subjective Type)Time: 33 Minutes
2.Write short answers to any six (6) questions.[6 × 2 = 12]
- Explain the Haber process briefly.Ans: Ammonia is made by combining nitrogen and hydrogen in the ratio 1:3: N2 + 3H2 ⇌ 2NH3 + heat. Conditions: about 200 atm pressure, 450 °C temperature and finely divided iron as catalyst. The ammonia is liquefied and removed; unreacted gases are recycled.
- How is nitrogen obtained from air?Ans: Air is cooled and compressed until it becomes liquid. Liquid air is fractionally distilled: nitrogen (b.p. -196 °C) boils off first, leaving oxygen (b.p. -183 °C).
- How is sulphur dioxide prepared in the Contact Process? Write chemical reactions.Ans: By burning sulphur in air: S + O2 → SO2. Or by roasting iron pyrite: 4FeS2 + 11O2 → 2Fe2O3 + 8SO2.
- Why are gases dried before oxidation in Contact process?Ans: Moisture and impurities poison (reduce the efficiency of) the V2O5 catalyst, and moisture forms acid mist that corrodes the apparatus. So the gases are purified and dried with concentrated H2SO4.
- Write the conditions required for oxidation of SO2.Ans: 2SO2 + O2 ⇌ 2SO3 + heat. Conditions: temperature 450 °C, pressure 1-2 atm, V2O5 catalyst, excess of oxygen, and pure dry gases.
- Why non-metal oxides are acidic.Ans: Non-metal oxides dissolve in water to form acids (e.g. SO3 + H2O → H2SO4; CO2 + H2O → H2CO3) and react with bases to form salts.
- What are Neutral oxides? Briefly explain with examples.Ans: Oxides that show neither acidic nor basic properties; they do not react with acids or bases and do not form acids or bases with water. Examples: CO, NO, N2O.
- Why high pressure is maintained in the production of ammonia?Ans: The reaction reduces the number of gas moles (4 → 2). By Le Chatelier’s principle, high pressure shifts the equilibrium forward and increases the yield of NH3.
- Why lead oxide is called amphotenic oxide?Ans: PbO reacts with both acids and bases: PbO + 2HCl → PbCl2 + H2O and PbO + 2NaOH → Na2PbO2 + H2O. Hence it is amphoteric.
Note: Attempt any one question.[5 × 1 = 5]
3.What are the sources of nitrogen and hydrogen gases used in Haber’s process? Explain it.
Ans:
- Nitrogen: from air by fractional distillation of liquid air.
- Hydrogen: from natural gas (methane) by steam reforming: CH4 + H2O → CO + 3H2 (about 750 °C, nickel catalyst); then CO + H2O → CO2 + H2.
- The gases are mixed in the ratio 1:3, compressed to about 200 atm, passed over iron catalyst at 450 °C: N2 + 3H2 ⇌ 2NH3. Ammonia is liquefied and unreacted gases are recycled.
4.Describe the contact process for the production of sulphuric acid.
Ans:
- Preparation of SO2: S + O2 → SO2 (or roasting FeS2).
- Purification: gases are purified and dried to protect the catalyst.
- Oxidation: 2SO2 + O2 ⇌ 2SO3 + heat, at 450 °C, 1-2 atm with V2O5 catalyst.
- Absorption: SO3 is absorbed in 98% H2SO4 to form oleum: SO3 + H2SO4 → H2S2O7.
- Dilution: oleum + water gives concentrated H2SO4: H2S2O7 + H2O → 2H2SO4.
