MCQ Class 10-NCERT -Science-Chapter 1-Test-2 Chapter 1: Chemical Reactions and Equations Multiple Choice Questions No of Questions : 10 Marks: 10 Please enter your email: 1. Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is 1:2 1:1 2:1 4:1 2. Which of the following is(are) an endothermic process(es)? (i) Dilution of sulphuric acid (ii) Sublimation of dry ice (iii) Condensation of water vapours (iv) Evaporation of water (iii) only (ii) and (iv) (ii) only (i) and (iii) 3. 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? Lead acetate Lead sulphate (insoluble) Ammonium nitrate Potassium sulphate 4. Which of the following gases can be used for storage of fresh sample of an oil for a long time? Carbon dioxide or helium Carbon dioxide or oxygen Helium or nitrogen Nitrogen or oxygen 5.The following reaction is used for the preparation of oxygen gas in the laboratory Which of the following statement(s) is(are) correct about the reaction? It is a combination reaction It is a decomposition reaction and endothermic in nature It is a decomposition reaction and accompanied by release of heat It is a photochemical decomposition reaction and exothermic in nature 6. Which one of the following processes involve chemical reactions? Storing of oxygen gas under pressure in a gas cylinder Liquefaction of air Keeping petrol in a china dish in the open Heating copper wire in presence of air at high temperature 7. In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature? 2H2(g) + O2(l) → 2H2O(l) 2H2(l) + O2(l) → 2H2O(g) 2H2(g) + O2(g) → 2H2O(g) 2H2(g) + O2(g) → 2H2O(l) 8. Which of the following are combination reactions? (ii) and (iv) (i) and (iii) (ii) and (iii) (iii) and (iv) 9. Which of the statements about the reaction below are incorrect? 2PbO(s) + C(s) → 2Pb(s) + CO2 (a) Lead is getting reduced. (b) Carbon dioxide is getting oxidised. (c) Carbon is getting oxidised. (d) Lead oxide is getting reduced. (a), (b) and (c) all (a) and (c) (a) and (b) 10. Fe2O3+ 2Al →Al2O3 + 2Fe The above reaction is an example of a ___________ double displacement reaction. decomposition reaction combination reaction. displacement reaction. Loading … Question 1 of 10
