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Class 10 Chemistry Chapter 19 Test 4 | Nitrogen and Sulphur
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 4. This full unit test is part of our comprehensive Class 10 Chemistry Chapter-Wise Test Series, designed to help students revise important concepts and assess their exam preparation. Based on the new syllabus issued by PECTAA Punjab, this test is included in the Punjab Board 2027 Model Papers collection. Practice Class 10 Chemistry questions, strengthen your understanding of Nitrogen and Sulphur, and prepare confidently for the upcoming annual board examinations.
Chapter: 19
Total Time: 35 min
CHAPTER WISE CLASS TEST
(Test # 4)
Chemistry
Total Marks: 25
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.
TIME: 10 MinOBJECTIVEMARKS: 8
Q.1:(08)
1.
Secondary pollutants present in the atmosphere are:
(A) Oxides of nitrogen(B) Oxides of Sulphur(C) Ozone and PAN(D) Oxides of Carbon
Answer: (C) Ozone and PAN
2.
Metal oxides are typically:
(A) Covalent compounds(B) Ionic compounds(C) Metallic compounds(D) Molecular compounds
Answer: (B) Ionic compounds
3.
SO3 is absorbed in H2SO4 rather than H2O during the production of sulphuric acid because:
(A) SO3 does not react with H2O(B) Reaction of SO3 with H2O is highly exothermic producing mist of H2SO4 which is difficult to condense.(C) It gives better yield of H2SO4(D) reaction of SO3 with H2O can cause explosion.
Answer: (B)
4.
Elements in Group 1 and 2 react with cold water producing:
(A) Oxides and oxygen(B) Hydroxides and hydrogen(C) Sulphides and hydrogen(D) Chlorides and water
Answer: (B) Hydroxides and hydrogen
5.
Oxides formed when oxygen reacts with metals:
(A) Acidic(B) Basic(C) Both basic and amphoteric(D) Neutral
Answer: (C) Both basic and amphoteric (e.g. Na2O, MgO are basic; Al2O3, ZnO are amphoteric).
6.
Metals above hydrogen in reactivity series react with dilute acids to give:
(A) Oxides and water(B) Salts and hydrogen(C) Hydroxides and water(D) Carbonates and CO?
Answer: (B) Salts and hydrogen
7.
Major components of acid rain are:
(A) H2SO4 and HNO3(B) H2SO3 and HNO2(C) H2SO4 and HCl(D) Acetic acid and HNO3
Answer: (A) H2SO4 and HNO3
8.
The pH of acid rain is:
(A) Equal to 7(B) Greater than 7(C) Less than 5.6(D) Between 6 and 7
Answer: (C) Less than 5.6
TIME: 25 MinSUBJECTIVEMARKS: 17
(PART – I)
Q.2 Write short answers to following questions.(6×2=12)
i.
How do magnesium and calcium differ with each other towards their reactions with water?
Magnesium reacts very slowly with cold water (readily only with steam: Mg + H2O → MgO + H2), while calcium reacts steadily with cold water: Ca + 2H2O → Ca(OH)2 + H2. Calcium is more reactive because it is larger and loses electrons more easily.
ii.
What are metals?
Elements that readily lose electrons to form positive ions. They are lustrous, malleable, ductile and good conductors of heat and electricity, e.g. Na, Mg, Fe, Cu.
iii.
Which secondary pollutants are produced by oxides of nitrogen?
Ozone (O3) and peroxyacyl nitrates (PAN), formed by sunlight acting on NO2 and hydrocarbons; they are the main components of photochemical smog.
iv.
Give an example of displacement reaction.
Zn + CuSO4 → ZnSO4 + Cu (more reactive zinc displaces copper from its salt solution).
v.
How SO2 present in the atmosphere is converted to SO3?
SO2 is oxidised by atmospheric oxygen, ozone or other oxidants (in presence of sunlight and dust/catalytic particles): 2SO2 + O2 → 2SO3. SO3 then dissolves in rain water to form H2SO4.
vi.
What is photochemical smog?
A brownish haze formed when sunlight reacts with nitrogen oxides and volatile hydrocarbons from vehicle exhaust, producing ozone and PAN. It irritates eyes and lungs.
(PART – II)
Note: Attempt the following question.
Q.3: Describe the role of oxides of nitrogen in the formation of PAN and the acid rain.(5)
Formation of NOx: At the high temperature in vehicle engines, N2 + O2 → 2NO; NO is oxidised in air: 2NO + O2 → 2NO2.
PAN: In sunlight NO2 splits: NO2 → NO + O. The oxygen atom forms ozone (O + O2 → O3). NO2 also combines with radicals from hydrocarbons to give peroxyacyl nitrates (PAN), the irritants of photochemical smog.
Acid rain: NO2 dissolves in rain water: 4NO2 + 2H2O + O2 → 4HNO3. Together with H2SO4 from SO2, this lowers rain pH below 5.6, damaging plants, soil, buildings and water life.
PAN: In sunlight NO2 splits: NO2 → NO + O. The oxygen atom forms ozone (O + O2 → O3). NO2 also combines with radicals from hydrocarbons to give peroxyacyl nitrates (PAN), the irritants of photochemical smog.
Acid rain: NO2 dissolves in rain water: 4NO2 + 2H2O + O2 → 4HNO3. Together with H2SO4 from SO2, this lowers rain pH below 5.6, damaging plants, soil, buildings and water life.
