MCQ Class 10-NCERT -Science-Chapter 1-Test-3 Chapter 1: Chemical Reactions and Equations Multiple Choice Questions No of Questions : 21 Marks: 23 Please enter your email: 1. Identify the correct equation for the reaction between sodium and water. 2H2O + Na –> H2 + 2NaOH 2H2O + 2Na –> H2 + NaOH H2O + 2Na –> H2 + 2NaOH 2H2O + 2Na –> H2 + 2NaOH 2: How can the black coating of the heated CuO be turned to brown? By passing hydrogen gas By reheating the material. None of the any By placing it in water. 3: When do you use double arrow in a chemical equation? None of the any When reaction is reversible. When reaction proceeds in forward direction. When reversible reaction is at equilibrium. 4. Amino acid is formed by decomposition of which component of our diet? carbohydrate protein starch fat 5. What happens when magnesium ribbon is burned? Burns with a dazzling white flame. None of the any The ribbon burns out without leaving any residue. Burns with a dazzling white flame and changes into a white powder. 6: Loss of electrons is called….. non of the any oxidation can be oxidation or reduction reduction 7: What is the chemical name of quick lime? calcium carbonate carbon dioxide calcium oxide calcium hydroxide 8: What would be products formed by the decomposition reaction of H2O2? H2O2 H2O2 + O2 H2O + O2 H2O 9: Which of the following is not true about skeletal equation? It is a combination reaction It does not mention the states of the reactants and products. It is unbalanced. It is a balanced chemical equation. 10. What happens when dilute hydrochloric acid is added to iron filings Iron salt and water are produced. Hydrogen gas and iron chloride are produced. Chlorine gas and iron hydroxide are produced. No reaction takes place. 11: A substance losing oxygen during a reaction Oxidised displacement reaction Reduced Electrolysed 12. A substance in a reaction which oxidises itself and reduces the other is called None of any given here Oxidising agent Both oxidising and reducing agent Reducing agent 13. What kind of reaction is the burning of natural gas? Decomposition reaction Combination reaction Double displacement reaction Displacement reaction 14. The powder produced by burning magnesium ribbon is Magnesium peroxide Magnesium trioxide Magnesium carbonate Magnesium oxide 15. What would be the products of the reaction C12H26 + O2 ? None of these 24 CO2 + 26 H2O 4 CO2 + 2 H2O + 2 N2 3 CO2 + 4 H2O 16. What happens when dilute Sulphuric acid is added to Zn granules? No reaction takes place Chlorine gas and Zinc hydroxide are produced Zinc salt and water are produced Hydrogen gas and Zinc chloride are produced. 17. Which element is getting oxidised in this reaction: CuO +H2 + heat –> Cu+H2O Hydrogen None of them Copper(II) oxide Both copper(II) oxide and hydrogen 18. The chemical name of rust is: Hydrated ferric oxide Hydrated ferrous oxide Ferrous oxide Ferric Oxide 19. Amion acid is formed by decomposition of which component of our diet? protein carbohydrate fat starch 20. Which of the following reaction will not take place? Zn + FeSO4 → ZnSO4 + Fe 2KI + Cl2→ 2KCl + l2 Mg+ CuSO4 → MgSO4 +Cu Zn + MgSO4 → ZnSO4 + Mg 21. Which of the following is not an example of decomposition reaction? C(s) + O2(g) –> CO2(g) CaCO3(s) + Heat –> CaO(s) + CO2(g) 2AgBr(s) + Sunlight –> 2Ag(s) + Br2(g) 2FeSO4(s) + Heat –> Fe2O3(s) + SO2(g) + SO3(g) Loading … Question 1 of 21
