10th Science Unit 10 TYPES OF CHEMICAL REACTIONS Free Online Test

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1. Photolysis is a decomposition reaction caused by..............

1 point

a. heat

b. electricity

c. light

d. mechanical energy

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2. The chemical equation Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2NaCl(aq) represents which of the following types of reaction?

1 point

a. Neutralisation

b. Combustion

c. Precipitation

d. Single displacement

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3. Which of the following statements are correct about a chemical equilibrium?(i) It is dynamic in nature(ii) The rate of the forward and backward reactions are equal at equilibrium(iii) Irreversible reactions do not attain chemical equilibrium(iv) The concentration of reactants and products may be different

1 point

a. i, ii and iii

b. i, ii and iv

c. ii, iii and iv

d. i, iii and iv

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4. A single displacement reaction is represented by X(s) + 2HCl(aq) → XCl2(aq) + H2(g). Which of the following(s) could be X.(i) Zn (ii) Ag (iii) Cu (iv) Mg. Choose the best pair.

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a. i and ii

b. ii and iii

c. iii and iv

d. i and iv

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5. Which of the following is not an “element + element → compound” type reaction?

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a. C(s) + O2(g) → CO2(g)

b. 2K(s) + Br2(l) → 2KBr(s)

c. 2CO(g) + O2(g) → 2CO2(g)

d. 4Fe(s) + 3O2(g) → 2Fe2O3(s)

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6. Which of the following represents a precipitation reaction?

1 point

a. A(s) + B(s) → C(s) + D(s)

b. A(s) + B(aq) → C(aq) + D(l)

c. A(aq) + B(aq) → C(s) + D(aq)

d. A(aq) + B(s) → C(aq) + D(l)

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7. Powdered CaCO3 reacts more rapidly than flaky CaCO3 because of ............

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a. large surface area

b. high pressure

c. high concentration

d. high temperature

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8. Which of the following information is not conveyed by a balanced chemical equation?

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a) physical states of reactants and products.

b) symbols and chemicals formula of reactants and products.

c) number of atoms/molecules of the reactants and product formed.

d) feasibility of a chemical reaction.

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9. The product formed when calcium oxide reacts with water is

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a) slaked lime

b) carbon dioxide

c) calcium oxide

d) oxygen gas

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10. The reaction between hydrogen and oxygen gas to form water is .............reaction.

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a) combination

b) redox

c) exothermic

d) all of these

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11. CaCO3(s) heatCa(s) + CO2(g) The above thermal decomposition reaction is an............ reaction.

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a) endothermic

b) exothermic

c) both a&b

d) neither a nor b

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12. Formation of ammonia from nitrogen and hydrogen is an examole of .................reaction.

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a) thermal decomposition

b) combination

c) precipitation

d) displacement

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13. Decomposition reactions are brought about by ........................

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a) heat

b) light

c) electricity

d) all the above

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14. Pick out the metal that displaces hydrogen from hydrochloric acid.

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a) Zinc

b) Silver

c) Copper

d) Gold

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15. When a double displacement reaction takes place, one of the products must be

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a) precipitate

b) water

c) either a or b

d) neither a nor b

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16. Pb(NO3)2 +2KI  PbI2 + is a.............reaction.

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a) neutralization

b) precipitation

c) decomposition

d) combustion

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17. Which among the following factors affect the rate of a reaction?

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a) surface area of reactants

b) pressure

c) temperature

d) all the above

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18. Ionic product of wate r is expressed

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a) Kw = [H3O+] [OH-]

b) Kw = [H+] [OH-]

c) both a&b

d) neither a nor b

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19. Acids have pH

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a) less than 7

b) greater than 7

c) equal to 7

d) less tha 14

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20. Chemically rust is

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a) hydrated ferrous oxide

b) ferrous oxide

c) hydrated ferric oxide

d) ferric oxide

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