SSC Worksheet for Chapter - 5 Chemical Reactions Class 10

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Find SSC Worksheet for chapter-5 Chemical Reactions class 10

CLASS-10

BOARD: SSC

Chemistry Worksheet-5

TOPIC:Chemical Reactions

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1. Fe₂O₃ + 2Al→Al₂O₃ + 2Fe

The above reaction is an example of a

(a) combination reaction

(b) double displacement reaction

(c) decomposition reaction

(d) displacement reaction

2. Which of the following is not a physical change ?

(a) Boiling of water to give water vapour

(b) Melting of ice to give water

(c) Dissolution of salt in water

(d) Combustion of liquefied petroleum gas

3. 4NH₃(g) + 5O₂ (g)→4NO(g) + 6H₂O(g)

Which type of reaction is this ?

(a) displacement reaction

(b) combination reaction

(c) redox reaction

(d) neutralisation reaction

4. Which of the following is/ are exothermic processes ?

(a) reaction of water with quick time

(b) dilution of an acid

(c) evaporation of water

(d) sublimation of camphor

5. Mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is

(a) 1 : 1

(b) 2 : 1

(c) 4 : 1

(d) 1 : 2

6. Which of the following is/are an endothermic processes ?

(a) dilution of sulphuric acid

(b) sublimation of dry ice

(c) condensation of water vapours

(d) evaporation of water

7. Which one of the following processes involve chemical reactions ?

(a) Heating copper wire in the presence of air at high temperature

(b) Liquefaction of air

(c) Storing of oxygen gas under pressure in a cylinder

(d) Keeping petrol in open in a china dish

8. Which of the following are combination reactions ?

(a) Zn + FeSO₄→ZnSO₄ + Fe

(b) MgO + H₂O→Mg(OH)₂

(c) 2KClO₃ 2KCl + 3O₂

(d) 4Al + 3O₂ ® 2Al₂O₃

9. Which of the following gas can be used for storage of fresh sample of an oil for a long time ?

(a) CO₂

(b) N₂

(c) He

(d) O₂

10. Which among the following is /are double displacement reaction ?

(a) Pb + CuCl₂→PbCl₂ + Cu

(b) Na₂SO₄ + BaCl₂→BaSO₄ + 2NaCL

(c) C + O₂→CO₂

(d) CH₄ + 2O₂→CO₂ + 2H₂O

11. Write correct explanation for following reaction ?

2KMnO₄ + FeSO₄ + 8H₂SO₄→5Fe₂ (SO₄)₃ + K₂SO₄ + 2MnSO₄ + 8H₂O

(a) FeSO₄ acts as an oxidizing agent and oxidizes KMnO₄

(b) KMnO₄ acts as an oxidizing agent and oxidizes FeSO₄

(c) H₂SO₄ acts as an oxidizing agent and oxidizes FeSO₄

(d) H₂SO₄ acts as an oxidizing agent and oxidizes KMnO₄

12. CaO(s) + H₂O(l)→Ca(OH)₂ + q

Which of the following statements is/are correct ?

(a) It is an endothermic reaction

(b) It is an exothermic reaction

(c) The pH of the resulting solution will be more than seven

(d) The pH of the resulting solution will be less than seven

13. BaCl₂ + (NH₄)₂SO₄→BaSO₄↓+ 2NH₄Cl

Which of the following is true for this reaction ?

(a) displacement reaction

(b) precipitation reaction

(c) combination reaction

(d) double displacement reaction

14. 2KClO₃(s) 2KCl(s) + 3O₂(g)

Which of the following statement(s) is /are correct about the reaction ?

(a) It is decomposition reaction and endothermic in nature

(b) It is combination reaction

(c) It is decomposition reaction and exothermic in nature

(d) It is photochemical decomposition and exothermic

15. Correct states of the reactions and products involved at reaction temperature ?

(a) 2H₂ (l) + O₂ (l)→2H₂O (g)

(b) 2H₂ (g) + O₂ (l)→2H₂O (l)

(c) 2H₂ (g) + O₂ (g)→2H₂O (l)

(d) 2H₂ (g) + O₂ (g)→2H₂O (g)

16. Identify the reducing agent in the following reactions

(a) 4NH₃ + 5O₂→4NO +6H₂O

(b) H₂O + F₂→HF + HOF

(c) Fe₂O₃ + 3CO→2Fe + 3CO₂

(d) 2H₂ + O₂→2H₂O

17. Identify the oxidizing agent on the following reactions.

(a) Pb₃O₄ + 8HCl→3PbCl₂ + Cl₂ + 4H₂O

(b) 2Mg + O₂→2MgO

(c) CuSO₄ + Zn→Cu + ZnSO₄

(d) V₂O₅ + 5Ca→2V + 5CaO

(e) 3Fe + 4H₂O→Fe₃O₄ + 4H₂

(f) CuO + H₂→Cu + H₂O

18. Grapes hanging on the plant do not ferment but after being plucked from the plant can be fermented under what conditions do these grapes ferment ? It is chemical or a physical change ?

19. Explain the following terms.

(a) Rancidity

(b) Endothermic reaction

(c) Redox reactions

(d) Neutralisation

(e) Corrosion

20. Oil and fat containing food items are flushed with nitrogen, why ?

Acids, Bases and Salts

21. A solution reacts with crushed egg-shells to give a gas that turns lime water milky, the solution contains

(a) NaCl

(b) HCl

(c) LiCl

(d) KCl

22. Which one of the following types of medicines is used for treating indigestion ?

(a) antibiotic

(b) antacid

(c) analgesic

(d) antiseptic

23. What happens when a solution of an acid is mixed with a solution of a base in a test tube ?

(a) the temperature of the solution increases

(b) the temperature of the solution decreases

(c) the temperature of the solution remains same

(d) salt formation takes place

24. An aqueous solution turns red litmus solution blue excess addition of which of the following solution would reverse the change ?

(a) Baking powder

(b) Ammonium hydroxide solution

(c) Lime

(d) Hydrochloride acid

25. Which of the following does not contain water of crystallization?

(a) Blue vitriol

(b) Baking soda

(c) Washing soda

(d) Crypsum

26. Sodium carbonate is a basic salt because it is a salt of

(a) Strong acid and strong back

(b) Weak acid and weak base

(c) Weak acid and strong base

(d) Strong acid and weak base

27. Calcium phosphate is present in tooth enamel, its nature is

(a) basic

(b) acidic

(c) neutral

(d) amphoteric

28. Which of the following substances will not give carbon dioxide on treatment with dilute acid ?

(a) Marble

(b) Lime

(c) Limestone

(d) Baking soda

29. Which one of the following can be used as an acid base indicator by a visually impased student ?

(a) Phenolphthalein

(b) vanilla essence

(c) Litmus

(d) Turmeric

30. Which of the following phenomena occurs when a small amount of acid id added to water ?

(a) Ionisation

(b) Salt formation

(c) Neutralisation

(d) Dilution

31. What are Olfactory indicators ? Explain with examples ?

32. While diluting an acid, why is it recommended that the acid should be added to water and not water to acid ?

33. Why does diluted water not conduct electricity, whereas rain water does ?

34. Why milkman adds a very small amount of baking soda to fresh milk explain ?

35. Identify the composed X on the basis of the reactions given below also write the name and chemical formula of A, B, C

Carbon and its Compounds

36. While cooking if the bottom of the vessel is getting blackened on the outside, it means that

(a) food is not cooked completely

(b) the fuel is not burning completely

(c) fuel is wet

(d) fuel is burning completely

37. Two products from a chemical reaction have pungent and pleasant smell respectively determine them

(a) ethanone and ethanal

(b) ethanoic acid and ethanol

(c) ethanoic acid and ethanone

(d) ethanal and ethanol

38. Oils on treating with hydrogen in the presence of palladium or nickel catalyst forms fats. This is an example of

(a) displacement reaction

(b) addition reaction

(c) oxidation reaction

(d) substitution reaction

39. The soap molecule has a

(a) hydrophilic head and hydrophobic tail

(b) hydrophobic head and hydrophilic tail

(c) hydrophobic head and hydrophobic tail

(d) hydrophilic head and hydrophilic tail

40. Which of the following represent saponification reaction ?

(a) CH₃COONa + NaOH CH₄ + Na₂CO₃

(b) CH₃COOH + C₂H₅OH CH₃COOC₂H₅ + H₂O

(c) 2CH₃COOH + 2Na→2CH₃COONa + H₂

(d) CH₃COOC₂H₅ + NaOH→CH₃COONa + C₂H₅OH

41. Vinegar is a solution of

(a) 50 – 60% acetic acid in alcohol

(b) 5 – 8% acetic acid in water

(c) 50 – 60% acetic acid in water

(d) 5 – 8% acetic acid in alcohol

42. Carbon exists in the atmosphere in the form of

(a) CO only

(b) CO in traces and CO₂

(c) CO₂ only

(d) CO₂ in traces and CO

43. Vegetable oils + H₂ fats (ghee) this reaction is called

(a) substitution

(b) dehydrogenation

(c) hydrogenation

(d) exothermic

44. Which one is not part of homologous series ?

45. Fill in the blank

C₂H₅OH + PCl₃→_____________

(a) C₂H₅Cl + H₃PO₄

(b) C₂H₅Cl + H₃PO₃

(c) C₂H₅COOH + CH₃OH

(d) CH₃ – CHO + CH₃ – CHO

46. What is difference between toilet and laundry soap ? Explain.

47. What is allotropy ? Give name of three elements who exhibit it also explain different types of carbon allotropes ?

48. Give a test that can be used to differentiate between butter and cooking oil ?

49. How would you distinguish between an alcohol and a carboxylic acid experimentally ?

50. A mixture of oxygen and ethyne is used for welding why do you think a mixture of air and ethyne is not used.

Periodic Classification of Elements

51. Which of the following statements is not a correct statement about the trends when going from left to right across the periodic table ?

(a) the elements becomes less metallic in nature

(b) the number of valence electron increases

(c) the atoms lose their electron more easily

(d) the oxide become more acidic

52. Arrange in increasing order of metallic character

(a) Ga > Ge > As > Se > Br

(b) Br > Se > As > Ge > Ga

(c) Ge > As > Ga > Se > Br

(d) Ga > As > Ge > Br > Se

53. Up to which element law of octaves was found to be applicable

(a) Oxygen

(b) Calcium

(c) Cobalt

(d) Potassium

54. Which of the following statements about the modern periodic table is correct?

(a) It has 18 horizontal rows known as periods

(b) It has 7 vertical columns known as periods

(c) It has 18 vertical columns known as groups

(d) It has 7 horizontal rows known as groups

55. Arrange the following elements in the order of their increasing non-metallic characters? Li, O, C, Be, F

(a) F < O < C < Be < Li

(b) F < O < Be < C < Li

(c) Li < Be < C < O < F

(d) F < O < C < Li < Be

56. Which of the following set of elements is written in order of their increasing metallic character

(a) Be, Mg, Ca

(b) Mg, Al, Si

(c) C, O, N

(d) Na, Li, K

57. On moving from left to right in a period in the periodic table, the size of the atom

(a) Increases

(b) Decreases

(c) Does not changes appreciably

(d) First decreases than increases

58. Which one of the following does not increase while moving down the group of the periodic table?

(a) Atomic radius

(b) Metallic character

(c) Valence

(d) No of shells is an element

59. Which one of the following is not triad?

(a) Cl, Br, I

(b) S, Se, Te

(c) C, Na, K

(d) Ca, Sr, Ba

60. Which of the following element will form an acidic oxide.

(a) An element with atomic number 7

(b) An element with atomic number 3

(c) An element with atomic number 12

(d) An element with atomic number 19

61. “Hydrogen occupies a unique position in modern periodic table” justify the statement.

62. Give an account of process adopted by mendeleef for the classification of electron how did he arrive at ‘Periodic Law’?

63. An element X with (atomic number 17) reacts with an element Y(atomic number 20) to form a divalent halide.

(a) Where in the periodic table are elements X and Y placed

(b) Classify X and Y as metal or non-metal

(c) What will be nature of oxide of element Y, identify nature of bonding in compound formed.

(d) Draw electron dot structure of compound formed.

64. How could modern periodic table remove various anomalies of mendeleef’s periodic table?

65. What were the limitations of New land’s law of octaves?

Metals and Nonmetals

66. Which one of the following pairs will give displacement reactions?

(a) NaCl solution and copper metal

(b) MgCl₂ solution and aluminium metal

(c) FeSO₄ solution and silver metal

(d) Ag NO₃ solution and copper metal

67. Which one the following metals do not react with cold as well as hot water?

(a) Na

(b) Ca

(c) Mg

(d) Fe

68. Which one of following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?

(a) Feo

(b) Fe₂O₃

(c) Fe₃O₄

(d) Fe₂O₃& Fe₃O₄

69. What happens when calcium is treated with water?

(a) It does not react with water

(b) It reacts violently with water

(c) It reacts less violently with water

(d) Bubbles of hydrogen gas formed stick to the surface of calcium.

70. Composition of aqua-regia is

(a) dil HCl: conc. HNO₃(3:1)

(b) conc. HCl: dil HNO₃(3:1)

(c) conc. HCl: conc. HNO₃(3:1)

(d) dil HCl : dil HNO₃

71. Which of the following non-metal is a liquid?

(a) Carbon

(b) Brominc

(c) Phosphorous

(d) sulphur

72. Which of the following metal form an amphoteric oxide?

(a) Na

(b) Ca

(c) Al

(d) Cu

73. Which of the following non-metal is lustrous?

(a) Sulphur

(b) Oxygen

(c) Nitrogen

(d) Iodine

74. In stainless steel, iron is mixed with

(a) Ni and Cr

(b) Cu and Cr

(c) Ni and Cu

(d) Cu and Au

75. Which of the following are not ionic compounds?

(a) KCl

(b) HCl

(c) CCl₄

(d) NaCl

76. A metal A, which is uses in termite process, when heated with oxygen gives an oxide B, Which is amphoteric in nature, identify A and B. write down reactions of oxide B with the and NaOH.

77. Give the reaction involved during extraction of zinc from its ore by

(a) roasting of zinc ore

(b) calcinations of zinc ore.

78. What are constituents of solder alloy? Which property of solder makes it suitable for welding electrical wires?

79. Explain the following

(a) Reactivity of Al decrease of dipped in HNO₃?

(b) Difference between ores and minerals

(c) Tarnished copper utensils are cleansed with time juice or tamarind

80. Give the formulae of the stable binary compounds that would be formed by the combination of following pairs of elements

(a) Mg and N₂

(b) Li and O₂

(c) Al and Cl₂

(d) K and O₂

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