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MIND SHAPER, (SCIENCE ASSIGNMENT), CHEMICAL REACTIONS AND, EQUATIONS, 1. What is a redox reaction?, 2. What is corrosion? Explain its advantage and disadvantage., 3. What is rancidity? How can we reduce the problem of rancidity?, 4. How is corrosion different from rusting?, 5. What is meant by endothermic and exothermic reactions? Give suitable, example for each., 6. Define different types of chemical reaction and give examples for each., 7. Why is photosynthesis considered as an endothermic reaction?, 8. In electrolysis of water, why is the volume of gas collected over one electrode, double that of the other electrode?, 9. What happens when water is added to solid calcium oxide taken in a, container? Write a chemical formula for the same., 10. Give one use of quick lime., 11. Give three types of decomposition reaction., 12. Name the compound used for testing CO2 gas., Q13. What is oxidation reaction ? Give example.
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Q14. Give an example of photochemical reaction., Q15. Give an example of a decomposition reaction. Describe any activity to illustrate, such a reaction by heating., Q16. Why is respiration considered as exothermic process?, Q17. Balance the following chemical equation., Fe(s) +H2O(g) = Fe3O4 + H2(g), MnO2 + HCL = MnCl2 + Cl2 + H2O, HNO3 + Ca(OH)2 = Ca(NO3)2 + H2O, Q18. On what basis is a chemical equation balanced?, Q19. State any two observations in an activity suggesting the occurrence of a chemical, reaction., Q20. Name a reducing agent which may be used to obtain manganese from manganese, dioxide., Q21. What change in colour is observed when silver chloride is left exposed to sunlight?, Also mention the type of chemical reaction., Q22. Define a combination reaction. Give one example of an exothermic combination, reaction., , 2
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Q23. What is observed when a solution of potassium iodide is added to lead nitrate, solution?, What type of reaction is this? Write a balanced chemical equation for this, reaction., Q24. Distinguish between an exothermic and an endothermic reaction., Q25. Distinguish between a displacement and a double displacement reaction., Q26. Identify the type of reaction in the following:, Fe + CuSO4(aq) = FeSO4(aq) + Cu(s), 2H2 + O2 = 2H2O, , (By TUSHAR SIR), , 3
