Chemical Reactions And Equations Practice Sheet Warrior 2025 PDF

Warrior 2025 Practice Sheet CHEMICAL REACTIONS AND EQUATIONS 1. The given reaction is an example of: 9. Which of the following statements about the BaCl2 (aq) + Na2SO4 (aq) → BaSO4(s) + 2NaCl(aq) rea...

Warrior 2025 Practice Sheet CHEMICAL REACTIONS AND EQUATIONS 1. The given reaction is an example of: 9. Which of the following statements about the BaCl2 (aq) + Na2SO4 (aq) → BaSO4(s) + 2NaCl(aq) reaction below are correct? i. Displacement 2PbO(s) + C(s) → 2Pb(s) + CO2(g) ii. Precipitation iii. Combination i. Lead is getting reduced. iv. Double displacement ii. Carbon dioxide is getting oxidized. (A) i and ii (B) i, ii, and iii iii. Carbon is getting oxidized. (C) ii and iv (D) i, ii, and iv iv. Lead oxide is getting reduced. (A) (i) and (ii) 2. Which of the following is an endothermic reaction? (B) (iii) and (iv) (A) C(s) + O2(g) → CO2(g) (B) N2(g) + O2(g) → 2NO(g) (C) (i), (ii), and (iii) (C) 2H2(g) + O2(g) → 2H2O(l) (D) All of the above (D) 2CH3OH(l) + 3O2(g) → 2CO2(g)+4H2O(l) 10. Assertion(A): In the given reaction, zinc acts as a 3. Find the value of a,b, and c for the given reaction. reductant but itself gets oxidized. aP4 + bCl2 → cPCl5 (A) 1, 10, 4 (B) 1, 10, 2 Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s) (C) 1, 5, 4 (D) 1, 10, 8 Reason(R): In a redox reaction, the oxidant gets reduced by accepting electrons, and the reductant 4. Why do we store silver chloride in dark bottles? gets oxidized by losing electrons. (A) To prevent it from decomposing in sunlight. (A) Both Assertion and Reason are true and (B) It undergoes displacement reaction. (C) It reacts with oxygen from the atmosphere. Reason is the correct explanation of Assertion. (D) None of the above (B) Both Assertion and Reason are true but Reason is not the correct explanation of 5. A neutralization reaction is a: Assertion. (A) Displacement reaction (C) Assertion is true but Reason is false. (B) Double displacement reaction (C) Addition reaction (D) Assertion is false but Reason is true. (D) Decomposition reaction 11. What is the colour of the precipitate formed when 6. Identify the substance that is oxidized in the given H2S is bubbled through copper sulphate solution? equation. MnO2 + 4HCl → MnCl2 + 2H2O + Cl2 (A) H2O (B) MnO2 12. What happens when a piece of silver metal is added (C) MnCl2 (D) HCl to copper sulphate solution? Also, write the balanced chemical equation if the reaction occurs. 7. 3BaCl2 + Al2(SO4)3 → 3BaSO4 + 2AlCl3 The above reaction is an example of a 13. Write the chemical reaction where the following (A) Combination reaction changes are observed. (B) Double displacement reaction (C) Decomposition reaction a. Gas is evolved (D) Displacement reaction b. Colour change is noticed 8. Silver jewellery becomes black on prolonged 14. Complete and balance the following equations. exposure to air due to the formation of (A) Ag2S and Ag3N (B) Ag2O and Ag2S a. NaOH + _______ → Na2SO4 + H2O (C) Ag2S only (D) Ag3N only b. Ca(OH)2 + _______ → CaCO3 + H2O 15. A shining metal ‘M’, on burning gives a dazzling 18. A small amount of quick lime is added to water in white flame and changes to a white powder ‘N’. a beaker. a. Identify ‘M’ and ‘N’. a. Name and define the type of reaction that has taken place. b. Represent the above reaction in the form of a b. Write a balanced chemical equation for the balanced chemical equation. above reaction and the chemical name of the c. Does ‘M’ undergo oxidation or reduction in product formed. this reaction? Justify c. List two main observations of this reaction. 16. What is the difference between displacement and 19. A shiny brown-coloured element ‘X’ on heating in double displacement reactions? Write equations for the air becomes black. Name the element ‘X’ and these reactions. the black-coloured compound formed. 20. Name the reducing agent in the following reaction: 17. What happens when a piece of: 3MnO2 + 4Al → 3Mn + 2Al2O3 a. Zinc metal is added to copper sulphate State which is more reactive, Mn or Al and why? solution. b. Aluminium metal is added to dilute hydrochloric acid.  ANSWER KEY 1. (C) 11. (Check Solution) 2. (B) 12. (Check Solution) 3. (A) 13. (Check Solution) 4. (A) 14. (Check Solution) 5. (B) 15. (Check Solution) 6. (D) 16. (Check Solution) 7. (B) 17. (Check Solution) 8. (C) 18. (Check Solution) 9. (B) 19. (Check Solution) 10. (A) 20. (Check Solution)  HINTS AND SOLUTIONS 1. (C) ii and iv 16. Displacement reaction: A displacement reaction 2. (B) N2(g) + O2(g) → 2NO(g) is a type of chemical reaction in which a more 3. (A) 1, 10, 4 reactive element displaces a less reactive element 4. (A) To prevent it from decomposing in sunlight. from its compound or salt solution. 5. (B) Double displacement reaction Example: Zn + CuSO4 → ZnSO4 + Cu 6. (D) HCl Double displacement reaction: A double 7. (B) Double displacement reaction displacement reaction is a type of chemical reaction 8. (C) Ag2S only in which two compounds react by exchanging their 9. (B) (iii) and (iv) ions to form new compounds. 10. (A) Both Assertion and Reason are true and Example: Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + Reason is the correct explanation of Assertion. 2NaCl(aq) 11. The black precipitate of CuS is formed when H2S 17. a. Zn + CuSO4 → ZnSO4 + Cu is bubbled through a copper sulphate solution. The blue colour of the CuSO4 solution fades, CuSO4 + H2S → CuS + H2SO4 and a colourless solution of ZnSO4 is formed. b. Aluminium reacts with dilute hydrochloric 12. No reaction will occur as silver is less reactive than acid to form aqueous aluminium chloride and water, and it will not displace copper from the hydrogen gas is evolved. copper sulphate solution. 2Al + 6HCl → 2AlCl3 + 3H2 Ag + CuSO4 → No Reaction 18. a. Combination Reaction. Reactions in which 13. Chemical reactions where the following changes two or more reactants combine to form one are observed. product are called Combination reactions. a. Gas is evolved b. CaO(s) + H2O () → Ca(OH)2(s) CaCO3 → CaO + CO2 (gas) c. (i) It produces a lot of heat. b. Colour change is noticed (ii) It produces a hissing sound. CuSO4 + Fe → FeSO4 + Cu (Blue) (Green) 19. The element ‘X’ is copper (Cu). The black-coloured compound is copper oxide 14. a. 2NaOH + H2SO4 → Na2SO4 + 2H2O (CuO). The reaction: b. Ca(OH)2 + CO2 → CaCO3 + H2O 2Cu + O2 → 2CuO 15. a. M is Magnesium and N is MgO (Magnesium 20. ‘Al’ is a reducing agent in the reaction. Oxide) ‘Al’ is more reactive than Mn, as ‘Al’ displaces Mn b. Mg + O2 → 2MgO from its oxide MnO2. c. M undergoes Oxidation in this reaction because oxygen is being added to it. PW Web/App- https://smart.link/7wwosivoicgd4 Library- https://smart.link/sdfez8ejd80if