Tenth Class
Bit Bank
Physical Science
2. Chemical Reactions and Equations Objective type questions 1. Fe2O3 + 2Al → Al2O3 + 2 Fe. This reaction is an example of_____________ A) Combination reaction B) Decomposition reaction C) Displacement reaction D) Double decomposition reaction
[ C ]
2. What happens when dil. HCl is added to iron filings? Choose the correct answer? [ A ] A) Hydrogen gas and iron chloride are produced. B) Chlorine gas and iron hydroxide are produced. C) No reaction takes place. D) Iron salt and water are produced. 3. 2 PbO(s) + C (s)→ 2Pb(s) + CO2 (g) Which of the following statements are correct for the above chemical reaction? A) Lead is reduced B) Carbon dioxide is oxidized C) Carbon is oxidized D) Lead oxide is reduced.
[
B ]
4. The chemical equation BaCl2 + Na2SO4→ BaSO4 + 2NaCl represents following type of chemical reaction. [ D ] A) Displacement B) combination C) decomposition D) double-displacement 5. The reaction of formation hydrogen chloride from hydrogen and chloride represents following type of chemical reaction [ C ] A) decomposition B) displacement C) combination D) double-displacement 6. Balance C3H8 + O2 → CO2 + H2O chemical equation, the coefficient of oxygen (O2) is __ [ A) 3 B) 4 C) 5 D) 6
C ]
7. Choose the chemical combination reaction? A) Extraction of metal B) Electrolysis. C) Burning of metals D) Addition of more active metal to a solution of less active metal compound.
[
C ]
8. Zn + 2HCl → ____ + H2 ↑ A) ZnCl B) ZnCl2
[ B
]
[ B D) Double displacement
]
C) ZnH
9. Which one of the following change is not oxidation? A) Combination B) Corrosion C) Rancidity 10. Which of this is a chemical reaction? A) Coal is burnt B) Crackers are burnt
D) Cl2
[ D ] C) Milk is converted into curd D) All the above
11. Which of the following process does not produce decomposition reaction? A) Electrolysis B) Distillation C) Exposure to light D) Thermal.
[ B
]
12. On heating copper powder in air, the surface of copper becomes black. It is _______ A) Combination reaction B) Decomposition reaction C) Dissociation reaction D) Displacement reaction
[ A ]
13. Corrosion can be prevented by? 1) Painting 2) oiling 3) Greasing 4) galvanizing A) 1 B) 1&2 C) 1, 2&3 D) 1, 2, 3&4
[ D
14. Choose double displacement reaction. A) X +YZ → XY +Z B) X + Y → XY C) XYZ → YZX
[ D ]
]
D) XY + AB → XA +YB
15. When copper vessels are kept over a period of time, these coated with a green surface. [ D ] This is due to _____________ (i) Oxidation of copper (ii) Corrosion of copper (iii) Reduction of copper (iv) hydrolysis of copper A) (i) and (iii) B) (ii) and (iii) C) (ii) and (iv) D) (i) and (ii) 16. Identify the redox reaction from among the following reactions A) PbCl2 + H2SO4 → PbSO4 + 2HCl B) AgNO3 + HCl → AgCl +HNO3 C) Fe2O3 + 2Al → Al2O3 +2Fe D) NH3 +HCl → NH4Cl. Prepared by :- Gali Sreekar M.Sc, M.Sc, B.Ed Chirala mandal, Prakasam.
[ C ]
9440234404
5
Tenth Class
Bit Bank
17. The chemical formula of marble is________________ A) ZnCO3 B) CaCO3 C) KCl
Physical Science [ B
]
18. When sodium sulphate (Na2 SO4) solution mixed with barium chloride (BaCl2) solution barium sulphate precipitate formed. What is the color of this precipitate? [ B A) Yellow B) white C) Blue D) Black
]
D) NaCl
19. What happens when dilute hydrochloric acid is added to iron filings? A) Hydrogen gas and Iron chloride are produced B) Chlorine gas and iron hydroxide are produced C) No reaction takes place D) Iron salt and water are produced.
[ A
]
20. Which is the good preservative of food? A) Cuso4 B) BaCl
[ C ] C) Vitamin C and E D) vitamin A
21. The symbol of precipitate reactions are _______________ A) ↑ B) ↓ C)→
[ B
]
D) ⇒
22. Light yellow coloured silver bromide exposed to sunlight, yellow colour changes to____ [ C ] A) White B) Black C) Gray D) Red 23. The color of copper oxide ( Cuo ) is? A) Blue B) Light red
[ D ] C) Bluish green
24. In a chemical reaction ‘∆’ represents ___________ A) Heating B) Exothermic C) Precipitate
D) Black [ A ] D) Endothermic
25. Chemical changes may be_________________ A) Exothermic B) Endothermic C) Both A and B
[ C ] D) None
26. All the decomposition reactions are ___________ A) Exothermic B) Endothermic C) Both A and B
D) None of these
27. Metal oxide is electric_____________ A) Conductor B) good conductor
C) Semi conductor
D) insulator
28. Na2SO4 + BaCl2 → _________+ 2 NaCl A) BaO B)Ba(OH)2
C) BaCl2
D) BaSO4
[ B
]
[ D ]
[ D
]
29. Which enzyme is caused for the change the color on the cut surface of the fruits like apples, pears, bananas, potatoes etc? [ D ] A) Inverts B) Zymase C) Glycerol D) Tyrosinase 30. ____________is a very good method of improving properties of metal. A) Galvanizing B) Alloying C) Painting D) Oxydation
[ B
31. Which of the following is not an alloy? A) Brass B) Bronze
[ D ] C) Steel
D) Iron
32. Rusting does not occur in ___________free water or ____________ A) Oxygen, dry air B) Nitrogen, dry air C) Oxygen, polluted air 33. Metals + Acid → ______________ A) Hydrochloride B) Hydrogen
]
[ A ] D) None of these [ B
]
34. In a chemical equation the molecular masses are expressed in __________ A) Molar mass B) Unified Masses(U) C) Milli gms D) Micro grams
[ B
]
35. Iron is mixed with carbon, nickel and chromium to get an alloy_____________ A) Brass B) Bronze C) Copper D) Stainless steel
[ D ]
C) Oxygen
D) Ammonia
Prepared by :- Gali Sreekar M.Sc, M.Sc, B.Ed Chirala mandal, Prakasam.
9440234404
6
Tenth Class
Bit Bank
Physical Science
36. When iron nail chipped in copper sulphate solution and left undisturbed for some time, the iron nail becomes brown due to formation of? [ A ] A) FeSO4 B) FeO C) SO2 D) FeS 37. Rancidity is a __________ reaction. A) Reduction B) Oxidation
[ B C) Redox
]
D) Displacement
38. Which of the following types of medicine is used for treating indigestion? A) Antibiotic B) Analgesic C) Antacid D) Antiseptic
[ C ]
39. Which of the following is a mineral acid? A) Oxalic acid B) Citric acid
[ D ] C) Acetic acid
D) Phosphoric acid
40. C(s) + O2 (g) → CO2 (g) is which type of reaction? A) Exothermic reaction B) Endothermic reaction C) Decompose reaction D) Displacement reaction
[ A
]
41. To prevent the potato chips from getting oxidization flush bags of chips are filled with? [ A A) Nitrogen gas B) Oxygen C) Hydrogen gas D) Fluorine
]
42. Fe2O3 + 2Al → Al2O3 + 2Fe. This equation is example of ________ A) Combination reaction B) Decomposition reaction C) Displacement reaction D) Double displacement reaction
[ C
]
43. The chemical formula of a ferric oxide is _________ B) Fe2O3 C) FeO A) Fe2O
[ B
]
44. The decomposition of vegetable into compost is an example of _____________reaction. [ B A) Reduction B) Oxidation C) Redox D) Rancidity
]
D) FeO2
46. 2Fe2O3 + 3C → 4Fe + 3CO2. This chemical reaction is an example of? A) Oxidation reaction B) reduction reaction C) Redox reaction
[ C ] D) None
47. C(s) + O2(g)→ CO2(g) + Q is an example of____________________ [ B ] A) Endothermic reaction B) Exothermic reaction. C) Redox reaction D) Oxidation reaction 48. Which of the following is a example of alloy? [ D ] A) Brass B) Bronze C) Steel D) All 49. The Color of copper oxide(CuO) _____________ A) Block B) Green C) Red
[ D ] D) Yellow
50. Galvanizing is a method o protecting iron form _______________ A) Rancidity B) Rusting C) Both A and B D) None of these
Prepared by :- Gali Sreekar M.Sc, M.Sc, B.Ed Chirala mandal, Prakasam.
[ B
9440234404
]
7
