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 + 2Na –> H2 + NaOH 2H2O + 2Na –> H2 + 2NaOH 2H2O + Na –> H2 + 2NaOH H2O + 2Na –> H2 + 2NaOH 2: How can the black coating of the heated CuO be turned to brown? None of the any By placing it in water. By reheating the material. By passing hydrogen gas 3: When do you use double arrow in a chemical equation? None of the any When reversible reaction is at equilibrium. When reaction is reversible. When reaction proceeds in forward direction. 4. Amino acid is formed by decomposition of which component of our diet? protein starch fat carbohydrate 5. What happens when magnesium ribbon is burned? 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. None of the any 6: Loss of electrons is called….. reduction oxidation can be oxidation or reduction non of the any 7: What is the chemical name of quick lime? carbon dioxide calcium hydroxide calcium carbonate calcium oxide 8: What would be products formed by the decomposition reaction of H2O2? H2O H2O + O2 H2O2 H2O2 + O2 9: Which of the following is not true about skeletal equation? It is a combination reaction It is a balanced chemical equation. It is unbalanced. It does not mention the states of the reactants and products. 10. What happens when dilute hydrochloric acid is added to iron filings Hydrogen gas and iron chloride are produced. Chlorine gas and iron hydroxide are produced. No reaction takes place. Iron salt and water are produced. 11: A substance losing oxygen during a reaction displacement reaction Reduced Electrolysed Oxidised 12. A substance in a reaction which oxidises itself and reduces the other is called Oxidising agent Both oxidising and reducing agent None of any given here 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 oxide Magnesium peroxide Magnesium trioxide Magnesium carbonate 15. What would be the products of the reaction C12H26 + O2 ? 3 CO2 + 4 H2O None of these 24 CO2 + 26 H2O 4 CO2 + 2 H2O + 2 N2 16. What happens when dilute Sulphuric acid is added to Zn granules? Zinc salt and water are produced Chlorine gas and Zinc hydroxide are produced No reaction takes place Hydrogen gas and Zinc chloride are produced. 17. Which element is getting oxidised in this reaction: CuO +H2 + heat –> Cu+H2O Copper(II) oxide Hydrogen Both copper(II) oxide and 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? starch protein fat carbohydrate 20. Which of the following reaction will not take place? Mg+ CuSO4 → MgSO4 +Cu Zn + FeSO4 → ZnSO4 + Fe 2KI + Cl2→ 2KCl + l2 Zn + MgSO4 → ZnSO4 + Mg 21. Which of the following is not an example of decomposition reaction? 2AgBr(s) + Sunlight –> 2Ag(s) + Br2(g) CaCO3(s) + Heat –> CaO(s) + CO2(g) 2FeSO4(s) + Heat –> Fe2O3(s) + SO2(g) + SO3(g) C(s) + O2(g) –> CO2(g) Loading … Question 1 of 21
