CBSE 10th Science Exam 2024: Final Topic-Wise Most Important Questions For Last Minute Revision Multiple Choice Question 1. In which of the following equations, the mass is not same on both the sides? (a) Word equation (b) Skeletal equation (c) Balanced equation (d) Both (a) and (b) Ans. (d) Both (a) and (b) 2. Some reactions require conditions like specific temperature, pressure, etc. While writing chemical equations for such reactions, where are these conditions usually mentioned? (a) Above the arrow (b) Along with products (c) Below the plus signs (d) Before the reactants Ans. (a) Above the arrow 3. On adding dilute HCl to copper oxide in a beaker, the solution turns blue green due to formation of (a) copper(II) hydroxide (b) copper nitrate (c) copper (II) chloride (d) copper sulphate Ans. (c) copper (II) chloride 4. Calcium carbonate is the chemical formula of (a) limestone (b) chalk (c) marble (d) all (a), (b) and (c) Ans. (d) all (a), (b) ...