Types of Chemical Reactions Book Back Questions & Answers
Unit 10 > Science > Class 10 > Samacheer Kalvi - English Medium
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1. H2(g) + Cl29(g)--------> 2HCl(g) is a
a. Decomposition Reaction
b. Combination Reaction
c. Single Displacement Reaction
d. Double Displacement Reaction
Correct answer: b. Combination Reaction
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2. Photolysis is a decomposition reaction caused by ___________
a. heat
b. electricity
c. light
d. mechanical energy
Correct answer: c. light
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3. A reaction between carbon and oxygen is represented by C(s) + O2(g) -------> CO2(g) + Heat. In which of the type(s), the above reaction can be classified? (i) Combination Reaction (ii) Combustion Reaction (iii) Decomposition Reaction (iv) Irreversible Reaction
a. i and ii
b. i and iv
c. i, ii and iii
d. i, ii and iv
Correct answer: d. i, ii and iv
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4. The chemical equation Na2 SO4(aq) + BaCl2(aq) -----------> BaSO4(s) + 2NaCl(aq) represents which of the following types of reaction?
a. Neutralisation
b. Combustion
c. Precipitation
d. Single displacement
Correct answer: c. Precipitation
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5. 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
a. i, ii and iii
b. i, ii and iv
c. ii, iii and iv
d. i, iii and iv
Correct answer: a. i, ii and iii
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6. 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.
a. i and ii
b. ii and iii
c. iii and iv
d. i and iv
Correct answer: d. i and iv
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7. Which of the following is not an element + element compound type reaction?
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)
Correct answer: c. 2CO(g) + O2(g)-----> 2CO2(g)
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8. Which of the following represents a precipitation reaction?
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)
Correct answer: c. A(aq) + B(aq) -------> C(s) + D(aq)
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9. The pH of a solution is 3. Its [OH-] concentration is
a. 1*10^-3 M
b. 3 M
c. 1*10^-11 M
d. 11 M
Correct answer: c. 1*10^-11 M
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10. Powdered CaCO3 reacts more rapidly than flaky CaCO3 because of ___________.
a. large surface area
b. high pressure
c. high concentration
d. high temperature
Correct answer: a. large surface area
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1. A reaction between an acid and a base is called _________________.
Correct answer: Neutrilization
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2. When lithium metal is placed in hydrochloric acid, ________ gas is evolved
Correct answer: Hydrogen
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3. The equilibrium attained during the melting of ice is known as ___________.
Correct answer: Physical equilibrium
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4. The pH of a fruit juice is 5.6. If you add slaked lime to this juice, its pH _____________ (increse/decrese)
Correct answer: Increases
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5. The value of ionic product of water at 250 C is _____________.
Correct answer: 1*10^-14
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6. The normal pH of human blood is _________
Correct answer: 7.35-7.45
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7. Electrolysis is type of _______________ reaction
Correct answer: decomposition
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8. The number of products formed in a synthesis reaction is _________
Correct answer: one
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9. Chemical volcano is an example for _______________ type of reaction
Correct answer: decomposition
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10. The ion formed by dissolution of H+ in water is called _______________
Correct answer: Hydronium ion
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1. NH4OH(aq) + CH3COOH(aq) ---> CH3COONH4(aq) + H2O(l)
Correct answer: Neutralization
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2. Zn(s) + CuSO4(aq) ----> ZnSO4(aq) + Cu(s)
Correct answer: Single displacement
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3. ZnCO3(s) +heat ----> ZnO(s) + CO2(g)
Correct answer: Thermal decompostion
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4. C2H4(g) + 4O2(g) ----> 2CO2(g) + 2H2O(g) + Heat
Correct answer: Combustion
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1. Silver metal can displace hydrogen gas from nitric acid.
Correct answer: FALSE (Silver metal cannot displace hydrogen gas from nitric acid.)
Correct Statement: Silver metal cannot displace hydrogen gas from nitric acid.
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2. The pH of rain water containing dissolved gases like SO3, CO2, NO2 will be less than 7.
Correct answer: TRUE
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3. At the equilibrium of a reversible reaction, the concentration of the reactants and the products will be equal.
Correct answer: FALSE (At the equilibrium of a reversible reaction, there is no change in the concentration of the reactants and the products.)
Correct Statement: At the equilibrium of a reversible reaction, there is no change in the concentration of the reactants and the products.
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4. Periodical removal of one of the products of a reversible reaction increases the yield.
Correct answer: TRUE
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5. On dipping a pH paper in a solution, it turns into yellow. Then the solution is basic.
Correct answer: FALSE (On dipping a pH paper in a solution, it turns into yellow. Then the solution is natural.)
Correct Statement: On dipping a pH paper in a solution, it turns into yellow. Then the solution is natural.