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Class 10 Chemistry Chapter 19 Nitrogen and Sulphur Test 3
Class 10 chemistry chapter 19 pdf download
Prepare for the Punjab Board Class 10 Chemistry Examination 2027 with Chapter 19: Nitrogen and Sulphur – Class Test 3. This full unit test is part of our comprehensive Class 10 Chemistry Chapter-Wise Test Series, developed to support students preparing for the Punjab Board annual examinations. Based on the new Chemistry syllabus issued by PECTAA Punjab, this test helps students revise important concepts, evaluate their understanding, and improve their exam preparation. Practice with our Punjab Board 2027 Model Papers and chapter-wise Chemistry tests to strengthen your knowledge and prepare confidently for the 10th Class Chemistry examination.
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Chapter: 19
Total Time: 35 min
Chapter Wise Class Test
(Test # 1)
Chemistry
Total Marks: 25
ABCD
1ABCD
2ABCD
3ABCD
ABCD
4ABCD
5ABCD
6ABCD
ABCD
7ABCD
8ABCD
NOTE: Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink. Cutting or filling two or more circles will result in zero mark in that question.
Q.1:(08)
1.The reason for maintaining higher temperature for the production of ammonia is:
(A) activation energy of the reaction is very high.(B) activation energy of the reaction is very low.(C) nitrogen and hydrogen are both gases.(D) at low temperature nitrogen and hydrogen change into liquids.
Answer: (A) – the activation energy of the reaction is very high, so a higher temperature is used.
2.The pressure used in Haber process is:
(A) 50 atm(B) 100 atm(C) 150 atm(D) 200 atm
Answer: (D) – 200 atm.
3.The contact process used for the industrial production of H2SO4 is sensitive to the impurities present in SO2 and O2 because the impurities:
(A) affect the capability of catalyst(B) affect the purity of H2SO4(C) decrease the rate of reaction appreciably(D) affect the capability of the catalyst
Answer: (A) – impurities poison the catalyst (option D is worded identically to A in the paper).
4.When methane reacts with limited oxygen, products are primarily:
(A) CO2 and H2O(B) CO and H2(C) CO2 and H2(D) CO and H2O
Answer: (B) – CO and H2.
5.Which of the following oxides is neutral in character?
(A) Al2O3(B) SO2(C) CO2(D) NO
Answer: (D) – NO is a neutral oxide.
6.The formula of Iron pyrite is:
(A) FeS(B) Fe2S3(C) FeS2(D) Fe2S
Answer: (C) – FeS2.
7.Sodium is considered more reactive than magnesium because:
(A) It is more electropositive than magnesium(B) It reacts with water slowly.(C) It is present in second group(D) It is the less metallic
Answer: (A) – it is more electropositive (loses its electron more easily).
8.SO2 is absorbed in 98% sulphuric acid to give:
(A) Dilute H2SO4(B) Water(C) Oleum (H2S2O7)(D) SO2
Answer: (C) – Oleum (H2S2O7). Strictly, it is SO3 that is absorbed in the contact process.
(PART – I)
Q.2 Write short answers to following questions.(6×2=12)
- How is nitrogen obtained from air?Ans: Air is cooled and compressed until it liquefies. Liquid air is then fractionally distilled: nitrogen (b.p. -196 °C) boils off first, leaving oxygen (b.p. -183 °C) behind.
- What is the reason of high pressure in Haber process?Ans: N2 + 3H2 ⇌ 2NH3 goes from 4 moles of gas to 2 moles, so high pressure (about 200 atm) shifts the equilibrium to the right (Le Chatelier’s principle) and increases the yield of ammonia.
- How is hydrogen produced from methane?Ans: Methane reacts with steam at about 750-800 °C over a nickel catalyst: CH4 + H2O → CO + 3H2. The CO then reacts with more steam: CO + H2O → CO2 + H2.
- What is the contact process?Ans: It is the industrial method for making sulphuric acid. SO2 is oxidised to SO3 by O2 over a V2O5 catalyst (2SO2 + O2 ⇌ 2SO3); SO3 is absorbed in 98% H2SO4 to form oleum, which is diluted to give H2SO4.
- Why CO2 is called an acidic oxide while CO is called a neutral oxide?Ans: CO2 dissolves in water to give carbonic acid (H2CO3) and reacts with bases to form salts, so it is acidic. CO neither reacts with acids nor bases and forms no acid or base with water, so it is neutral.
- What are basic oxides?Ans: Oxides of metals that react with acids to form salt and water, e.g. Na2O, MgO, CaO.
(PART – II)
Note: Attempt the following question.
Q.3: Differentiate between first and second group metals based on their reactivities with oxygen and water.(5)
Ans:
| Property | Group 1 (Alkali metals) | Group 2 (Alkaline earth metals) |
|---|---|---|
| With oxygen | Burn rapidly at room temperature to form oxides (4Na + O2 → 2Na2O) | Less vigorous; Mg burns on heating (2Mg + O2 → 2MgO) |
| With water | Violent reaction with cold water giving hydroxide and H2 (2Na + 2H2O → 2NaOH + H2) | Slower; Mg reacts very slowly with cold water but readily with steam (Mg + H2O → MgO + H2) |
| Reason | One valence electron, lost easily; larger atoms | Two valence electrons, higher ionisation energy; smaller atoms |
