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 proceeds in forward direction. When reversible reaction is at equilibrium. When reaction is reversible. 4. Amino acid is formed by decomposition of which component of our diet? starch fat carbohydrate protein 5. What happens when magnesium ribbon is burned? None of the any Burns with a dazzling white flame. 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 can be oxidation or reduction oxidation reduction 7: What is the chemical name of quick lime? calcium oxide calcium carbonate carbon dioxide calcium hydroxide 8: What would be products formed by the decomposition reaction of H2O2? H2O2 H2O2 + O2 H2O H2O + O2 9: Which of the following is not true about skeletal equation? It does not mention the states of the reactants and products. It is a balanced chemical equation. It is a combination reaction It is unbalanced. 10. What happens when dilute hydrochloric acid is added to iron filings Hydrogen gas and iron chloride are produced. Iron salt and water are produced. No reaction takes place. Chlorine gas and iron hydroxide are produced. 11: A substance losing oxygen during a reaction Electrolysed Oxidised Reduced displacement reaction 12. A substance in a reaction which oxidises itself and reduces the other is called None of any given here Both oxidising and reducing agent Oxidising agent Reducing agent 13. What kind of reaction is the burning of natural gas? Decomposition reaction Combination reaction Displacement reaction Double 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 3 CO2 + 4 H2O 4 CO2 + 2 H2O + 2 N2 24 CO2 + 26 H2O 16. What happens when dilute Sulphuric acid is added to Zn granules? No reaction takes place Chlorine gas and Zinc hydroxide are produced Hydrogen gas and Zinc chloride are produced. Zinc salt and water are produced 17. Which element is getting oxidised in this reaction: CuO +H2 + heat –> Cu+H2O Copper(II) oxide Both copper(II) oxide and hydrogen Hydrogen None of them 18. The chemical name of rust is: Ferric Oxide Ferrous oxide Hydrated ferrous oxide Hydrated ferric oxide 19. Amion acid is formed by decomposition of which component of our diet? carbohydrate fat starch protein 20. Which of the following reaction will not take place? Mg+ CuSO4 → MgSO4 +Cu Zn + FeSO4 → ZnSO4 + Fe Zn + MgSO4 → ZnSO4 + Mg 2KI + Cl2→ 2KCl + l2 21. Which of the following is not an example of decomposition reaction? 2FeSO4(s) + Heat –> Fe2O3(s) + SO2(g) + SO3(g) 2AgBr(s) + Sunlight –> 2Ag(s) + Br2(g) CaCO3(s) + Heat –> CaO(s) + CO2(g) C(s) + O2(g) –> CO2(g) Loading … Question 1 of 21
