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. H2O + 2Na –> H2 + 2NaOH 2H2O + 2Na –> H2 + 2NaOH 2H2O + 2Na –> H2 + NaOH 2H2O + Na –> H2 + 2NaOH 2: How can the black coating of the heated CuO be turned to brown? By placing it in water. By reheating the material. By passing hydrogen gas None of the any 3: When do you use double arrow in a chemical equation? When reaction proceeds in forward direction. When reversible reaction is at equilibrium. None of the any When reaction is reversible. 4. Amino acid is formed by decomposition of which component of our diet? starch protein carbohydrate fat 5. What happens when magnesium ribbon is burned? Burns with a dazzling white flame and changes into a white powder. None of the any Burns with a dazzling white flame. The ribbon burns out without leaving any residue. 6: Loss of electrons is called….. can be oxidation or reduction non of the any oxidation reduction 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? H2O2 H2O + O2 H2O 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 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 Electrolysed Reduced Oxidised displacement reaction 12. A substance in a reaction which oxidises itself and reduces the other is called Reducing agent Oxidising agent Both oxidising and reducing agent None of any given here 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 oxide Magnesium trioxide Magnesium carbonate 15. What would be the products of the reaction C12H26 + O2 ? None of these 3 CO2 + 4 H2O 24 CO2 + 26 H2O 4 CO2 + 2 H2O + 2 N2 16. What happens when dilute Sulphuric acid is added to Zn granules? Hydrogen gas and Zinc chloride are produced. No reaction takes place Chlorine gas and Zinc hydroxide are produced Zinc salt and water are produced 17. Which element is getting oxidised in this reaction: CuO +H2 + heat –> Cu+H2O None of them Copper(II) oxide Both copper(II) oxide and hydrogen 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? starch carbohydrate fat protein 20. Which of the following reaction will not take place? Zn + FeSO4 → ZnSO4 + Fe 2KI + Cl2→ 2KCl + l2 Zn + MgSO4 → ZnSO4 + Mg Mg+ CuSO4 → MgSO4 +Cu 21. Which of the following is not an example of decomposition reaction? 2AgBr(s) + Sunlight –> 2Ag(s) + Br2(g) 2FeSO4(s) + Heat –> Fe2O3(s) + SO2(g) + SO3(g) CaCO3(s) + Heat –> CaO(s) + CO2(g) C(s) + O2(g) –> CO2(g) Loading … Question 1 of 21
