9th Class Chemistry Full Book Paper

Q1. Multiple choice questions (Attempt all · 60 × 0.5 = 30)

1. Concentration of reactants and products at equilibrium remains unchanged if:
   1. concentration of any reactant or product is not changed
   2. temperature of the reaction is not changed.
   3. pressure or volume of the system is not changed.
   4. all of the above are observed.
2. Combustion of methane produces:
   1. Carbon dioxide
   2. Water
   3. Heat
   4. All of these
3. Benzene is:
   1. Polar compound
   2. Non-polar compound
   3. Homoatomic compound
   4. Monoatomic compound
4. Consider the reaction: H₂O + HCl ⇌ H₃O⁺ + Cl⁻. Which species is a proton acceptor in this reaction?
   1. H₂O
   2. HCl
   3. H₃O⁺
   4. none
5. CH3–CH2–CH3 is the chemical formula for:
   1. Ethane
   2. Propane
   3. Butane
   4. Pentane
6. Standard form of 38000000000 is:
   1. 3.8×10⁸
   2. 3.8×10⁹
   3. 3.8×10¹²
   4. 3.8×10¹⁰
7. Which isotope is commonly used to irradiate cancer cells?
   1. Iodine-123
   2. Carbon-14
   3. Cobalt-60
   4. Iodine-131
8. What is the mass of carbon present in 44 g of carbon dioxide?
   1. 12 g
   2. 6 g
   3. 24 g
   4. 44 g
9. What is eutrophication caused by?
   1. low phosphate concentration
   2. high concentration
   3. increase water flow
   4. improved water clarity
10. Which substance would have a higher rate of evaporation?
    1. water at 10 ºC
    2. water at 20 ºC
    3. water at 5 ºC
    4. water at 30 ºC
11. Which is not released in an aerobic respiration?
    1. Carbon dioxide
    2. Water
    3. Energy
    4. Lactic acid
12. Differentiate between accuracy and precision.
13. Which is/are responsible for acid rain?
    1. SO₂
    2. NO₂
    3. Both NO₂ and SO₂
    4. O₃
14. Oxidation involves:
    1. loss of electrons
    2. gain of electron
    3. gain of hydrogen
    4. none of these
15. Which gas turns lime water milky?
    1. ammonia
    2. carbon dioxide
    3. oxygen gas
    4. sulphur dioxide gas
16. Who discovered atomic number?
    1. Moseley
    2. Bohr
    3. Rutherford
    4. Cannizaro
17. Meat and fish provide:
    1. Carbohydrates
    2. Proteins
    3. Lipids
    4. Sugar
18. Pure Form of matter having particular characteristics is called:
    1. Mixture
    2. Substance
    3. Both a & b
    4. None of these
19. Which is true about the equilibrium state?
    1. The forward reaction stops.
    2. The reverse reaction stops.
    3. Both forward and reverse reaction stop.
    4. Both forward and reverse reaction continue at the same rate.
20. Reduction of chloromethane gives:
    1. Hydrogen
    2. Chlorine
    3. Methane
    4. All of these
21. The atoms having less than 2 or 8 electrons in their valence shell are:
    1. Stable
    2. Inreactive
    3. Unstable
    4. Noble gases
22. Milk of magnesia contains Mg(OH)₂. It is used as antacid. It neutralizes excess stomach acid. Which salt is formed in this reaction?
    1. MgSO₄
    2. MgCO₃
    3. MgCl₂
    4. MgO
23. Condensed structural formula for butane is:
    1. CH₃–CH₂–CH₃
    2. CH₃–CH₂–CH₂–CH₃
    3. CH₃–CH₂–CH₂–CH₂–CH₃
    4. CH₃–CH₃
24. 1 kilometer means:
    1. 100 m
    2. 1000 cm
    3. 1000 cm
    4. 1000 m
25. The force present between nucleus and electron is electrostatic force of :
    1. Attraction
    2. Repulsion
    3. Both a, b
    4. None of these
26. Number of particles in one mole of a substance is called:
    1. Atomic number
    2. Particle number
    3. Avogadro’s number
    4. Mass number
27. What is a commonly application of tap water in a chemistry laboratory?
    1. preparing chemical reagents
    2. calibration of sensors
    3. cleaning glasswater
    4. measuring pH level
28. What happens to a liquid in an enclosed space during evaporation until saturation in reached:
    1. it solidifies
    2. it remains constant
    3. it evaporates completely
    4. it continues to vaporize
29. If the value is negative then reaction will be:
    1. Exothermic
    2. Endothermic
    3. May or may not be Exothermic or Endothermic
    4. None of these
30. List some properties of water?
31. The normal rain has pH:
    1. 5.6
    2. 6.5
    3. 4.6
    4. 4.2
32. Oxidation is shown by:
    1. metals
    2. non-metals
    3. both a and b
    4. none of these
33. Which gas turns starch iodide paper blue-black?
    1. ammonia
    2. carbon dioxide
    3. chlorine gas
    4. oxygen gas
34. Which of the following elements belongs to VIII A?
    1. Na
    2. Mg
    3. Br
    4. Xe
35. Which foods are rich in fats?
    1. Rice & maize
    2. Pulses & wheat
    3. Milk, egg & beans
    4. Cheese, butter & oil
36. Anything that has mass and occupies space is called.
    1. liquid
    2. gas
    3. solid
    4. matter
37. Which of the following does not happen, when a system is at equilibrium state?
    1. forward and reverse reactions stop.
    2. forward and reverse rates become equal.
    3. concentration of reactants and products stop changing
    4. reaction continues to occur in both the directions.
38. Which product is obtained when chloromethane is reduced?
    1. Ethane
    2. Ethene
    3. Methane
    4. Ethyne
39. Which of the following is not true about the formation of Na₂S:
    1. Each sodium atom loses one electron
    2. Sodium forms cation
    3. Sulphur forms anion
    4. Each sulphur atom gains one electron
40. Which of the following cannot be classified as Arrhenius acid?
    1. HNO₃
    2. H₂CO₃
    3. CO₂
    4. H₂SO₄
41. The functional group of amines is:
    1. –OH
    2. –COOH
    3. –NH₂
    4. –CHO
42. Volume of liquid in cylinder is:
    1. 23
    2. 24
    3. 25
    4. 22
43. Which isotopes is commonly used to irradiate cancer cell.
    1. Iodine -123
    2. Carbon -14
    3. Cobalt-60
    4. Iodine-131
44. What is the molar mass of H₃PO₄?
    1. 58.5
    2. 98
    3. 40
    4. 48
45. What process is used to purify water to produce distilled water?
    1. filtration
    2. distillation
    3. reverse osmosis
    4. sedimentation
46. Which process involves the formation of stalagmites and stalactities in cave?
    1. filtration
    2. crystallization
    3. distillation
    4. evaporation
47. Activation energy of a chemical reaction must be ________ the average kinetic energy of reacting molecules.
    1. Lower than
    2. greater than
    3. equal to
    4. None of these
48. Fatima has fond of junk food like French fries, burgers, and pizza. What will happen if Fatima only eats junk food? What should she add to her routine food?
49. What air pollution is released by forest fires and storms?
    1. Smoke
    2. Ash
    3. Methane
    4. Nitrogen oxides
50. Silver tarnish in the presence of:
    1. SO₂
    2. H₂S
    3. Both a and b
    4. None of these
51. Electrons of alkali metals excite by absorbing the light in:
    1. Visible wavelength
    2. UV wavelength
    3. IR wavelength
    4. Radio wavelength
52. What is the sheilding effect?
    1. increase in nuclear charge
    2. decrease in atomic size
    3. reduction in force
    4. increase in ionization energy
53. Disorder NOT caused by protein deficiency:
    1. Weight loss
    2. Muscle fatigue
    3. Loss of strength
    4. Constipation
54. Macroscopic properties are properties that can be visualized by:
    1. the naked eye
    2. microscope
    3. electron microscope
    4. telescope
55. In an irreversible reaction equilibrium is:
    1. established quickly
    2. established slowly
    3. never established
    4. established when reaction stops.
56. Which molecule contains a carbon–carbon single bond?
    1. Ethane
    2. Ethene
    3. Ethyne
    4. Methanol
57. Which of the following atoms obey duplet rule?
    1. O₂
    2. F₂
    3. H₂
    4. N₂
58. Which of the following is a Bronsted base?
    1. NH₃
    2. HCl
    3. CH₃COOH
    4. H₃O⁺
59. The functional group is found in:
    1. Alcohols
    2. Ketones
    3. Carboxylic acids
    4. Esters
60. SI unit of mass is:
    1. kilogram
    2. centimetre
    3. kelvin
    4. millimetre