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Class – X CHEMISTRY

Chapter – Chemical Reactions and Equation

DPP - 1 Due Date:21/04/2016

1. Which of the following is (are) an endothermic process(es)? (i) Dilution of sulphuric acid (ii) Sublimation of dry ice (iii) Condensation of water vapours (iv) Evaporation of water (a) (i) and (iii) (b) (ii) only (c) (iii) only (d) (ii) and (iv) 2. 2 4 4 2Zn(s) H SO (aq.) SnSO (aq.) H (g) is an example of (a) precipitation reaction (b) endothermic reaction (c) evolution of gas (d) change in colour 3. A white precipitate will be formed if we add common salt solution to: (a) Ba(NO3)2 solution (b) KNO3 solution (c) AgNO3 solution (d) Mg(NO3)2 Solution 4. In an endothermic reaction (a) heat is liberated (b) heat is absorbed (c) heat is neither liberated nor absorbed (d) energy of products is lesser than then of reactants. 5. Formation of ammonia (a) involves liberation of heat (b) absorption of heat (c) involves neither absorption nor liberation of heat (d) is an endothermic process 6. Which of the following statements is/are true? (a) The total mass of the substance remains same in a chemical change (b) A chemical change is permanent and irreversible or reversible (c) A physical change is temporary and reversible (d) All the these 7. Select the correct statement. (a) Precipitation reactions produce insoluble salts (b) Rearrangement of atoms occurs in a chemical change (c) energy changes are noticed during chemical reactions (d) All of these Fill in the Blanks 8. Respiration is a ………….. process. 9. Neutralization reactions involves …………………