Chemical Reactions and Equations MCQs:
Hello guys, welcome to your own blog 'Pareeksha Time'. In this article, you will read CBSE Class 10 Science MCQs of Chapter 1. You will read Chemical Reactions and Equations MCQs for Term-1 Board Exams 2021-22.
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Chemical Reactions and Equations MCQs|MCQ Questions for Class 10 Chemistry Chapter 1 with Answers:-
1. Which information is not conveyed by a balanced chemical equation?
(a) Physical states of reactants and products
(b) Symbols and formulae of all the substances involved in a particular reaction
(c) Number of atoms/molecules of the reactants and products formed
(d) Whether a particular reaction is actually feasible or not
Answer: (d) Whether a particular reaction is actually feasible or not
2. The reaction of ‘magnesium’ with air is
(a) Exothermic reaction
(b) Endothermic reaction
(c) Reversible reaction
(d) Substitution reaction
Answer: (a) Exothermic reaction
3. Which of the following are exothermic processes?
(i) Reaction of water with quick lime
(ii) Dilution of an acid
(iii) Evaporation of water
(iv) Sublimation of camphor (crystals)
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (ii) and (iv)
Answer: (a) (i) and (ii)
4. A chemical reaction does not involve:
(a) Formation of new substances having entirely different properties than that of the reactants
(b) Breaking of old chemical bonds and formation of new chemical bonds
(c) Rearrangement of the atoms of reactants to form new products
(d) Changing of the atoms of on element into those of another element to form new products
Answer: (d) Changing of the atoms of on element into those of another element to form new products
5. Which of the following is not 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 (LPG)
Answer: (d) Combustion of Liquefied Petroleum Gas (LPG)
6. What chemicals are used in fireworks?
(a) Copper chloride
(b) Calcium chloride
(c) Barium chloride
(d) All of above
Answer: (d) All of above
7. Which of the following is an endothermic process?
(a) Dilution of sulphuric acid
(b) Sublimation of dry ice
(c) Condensation of water vapours
(d) Respiration in human beings
Answer: (b) Sublimation of dry ice
8. Which option denotes a double displacement reaction?
(a) A + B + C
(b) A + B → C
(c) AC + BD → AD + BC
(d) AC + B → AB + C
Answer: (c) AC + BD → AD + BC
9. Consider reaction:
Na(s) + O₂(g) → Na₂O
Moles of oxygen needed to balance equation are
(a) 1
(b) 2
(c) 3
(d) 4
Answer: (a) 1
10. Which one of the given processes involves chemical reactions?
(a) Storing of oxygen gas under pressure in a gas cylinder
(b) Keeping petrol in a China dish in the open
(c) Liquefaction of air
(d) Heating copper wire in the presence of air at high temperature
Answer: (d) Heating copper wire in the presence of air at high temperature
11. When green coloured ferrous sulphate crystals are heated, the colour of the crystal changes because
(a) It is decomposed to ferric oxide
(b) It loses water of crystallisation
(c) It forms SO2
(d) It forms SO3
Answer: (b) It loses water of crystallisation
12. In which of the given chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?
(a) 2H₂ (l) + O₂ (l) → 2H₂O (g)
(b) 2H₂ (g) + O₂ (l) → 2H₂O (g)
(c) 2H₂ (g) + O₂ (g) → 2H₂O (l)
(d) 2H₂ (g) + O₂ (g) → 2H₂O (g)
Answer: (c) 2H₂ (g) + O₂ (g) → 2H₂O (l)
13. An element X on exposure to moist air turns reddish-brown and a new compound Y is formed. The substance X and Y are
(a) X = Fe, Y = Fe2O3
(b) X = Ag, Y = Ag2S
(c) X = Cu, Y = CuO
(d) X = Al, Y = Al2O3
Answer: (a) X = Fe, Y = Fe2O3
14. The reaction in which two compounds exchange their ions to form two new compounds is called
(a) Displacement reaction
(b) Combination reaction
(c) Double displacement reaction
(d) Redox reaction
Answer: (c) Double displacement reaction
15. Which of the following is a thermal decomposition reaction ?
(a) 2H2O → 2H2 + O2
(b) 2AgCl → 2Ag + Cl2
(c) ZnCO3 → ZnO + CO2
(d) H2(g) + Cl2(g) → 2HCl(g)
Answer: (c) ZnCO3 → ZnO + CO2
16. The respiration process during which glucose undergoes slow combustion by combining with oxygen in the cells of our body to produce energy, is a kind of:
(a) Exothermic process
(b) Endothermic process
(c) Reversible Process
(d) Physical Process
Answer: (a) Exothermic process
17. Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of reaction involved?
(i) Displacement reaction
(ii) Precipitation reaction
(iii) Combination reaction
(iv) Double displacement reaction
(a) (i) only
(b) (ii) only
(c) (iv) only
(d) (ii) and (iv)
Answer: (d) (ii) and (iv)
18. The reaction of H₂ gas with oxygen gas to form water is an example of
(a) Combination reaction
(b) Redox reaction
(c) Exothermic reaction
(d) All of these
Answer: (a) Combination reaction
19. When Carbon dioxide is passed through lime water, then:
(a) Calcium hydroxide is formed
(b) White precipitate of CaO is formed
(c) Lime water turns milky
(d) Colour of lime water disappears
Answer: (c) Lime water turns milky
20. Which of the following is not True with respect to the neutralisation reaction?
(a) Salt is formed.
(b) Reaction occurs between an acid and a base.
(c) Reactive element displaces less reactive element.
(d) Reactants are in gaseous state
Answer: (d) Reactants are in gaseous state
21. Oxidation involves:
(i) Gain of electron
(ii) Loss of electron
(iii) Addition of oxygen or electronegative element
(iv) Removal of hydrogen or electropositive element
(a) (i), (ii), (iii)
(b) (ii), (iii), (iv)
(c) (i), (iii), (iv)
(d) (i), (ii), (iv)
Answer: (b) (ii), (iii), (iv)
22. Rancidity can be prevented by:
(a) Adding antioxidants
(b) Storing food away from light
(c) Keeping food in refrigerator
(d) All of these
Answer: (d) All of these
23. Which of the following statements about the given reaction are correct ?
3Fe(s) + 4H2O(g) → Fe3O4(g) + 6H2(g)
(i) Iron metal is getting oxidised
(ii) Water is getting reduced
(iii) Water is acting as reducing agent
(iv) Water is acting as an oxidising agent [NCERT Exemplar Problem]
(a) (i), (ii) and (iii)
(b) (iii) and (iv)
(c) (i), (ii) and (iv)
(d) (ii) and (iv)
Answer: (c) (i), (ii) and (iv)
24. In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?
(a) Lead sulphate (insoluble)
(b) Lead acetate
(c) Ammonium nitrate
(d) Potassium sulphate
Answer: (b) Lead acetate
25. Name the products formed when iron filings are heated with dilute hydrochloric acid:
(a) Fe (III) chloride and water
(b) Fe (II) chloride and water
(c) Fe (II) chloride and hydrogen gas
(d) Fe (III) chloride and hydrogen gas
Answer: (d) Fe (III) chloride and hydrogen gas
26. Oxidation is a process which involves:
(a) Addition of oxygen
(b) Addition of hydrogen
(c) Removal of oxygen
(d) None of these
Answer: (a) addition of oxygen
27. The process of reduction involves:
(a) Addition of oxygen
(b) Addition of hydrogen
(c) Both (a) and (b)
(d) None of these
Answer: (b) Addition of hydrogen
28. The condition produced by aerial oxidation of fats and oils in foods marked by unpleasant smell and taste is called:
(a) Antioxidation
(b) Reduction
(c) Rancidity
(d) Corrosion
Answer: (c) Rancidity
So guys here comes end. In this article, I shared 25+ Chemical Reactions and Equations MCQs of CBSE Class 10 Chemistry MCQs 2021-22.
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