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