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Give examples. Q2-Why burning of natural gas and respiration are considered as exothermic reactions? Q3-What happens when- a) Calcium oxide reacts with water b) Calcium hydroxide reacts with CO: ¢) Ferrous sulphate crystal is heated 4) Lead nitrate is heated ¢) Zine granules react with dilute HCI or dilute HsSO« x £) Copper powder is heated Q4-What is the chemical formula of ferrous sulphate crystal and what is its colour? Q5-Explain decomposition reaction with examples. Q6-Why is photosynthesis considered an endothermic renction? (© scanned with oken ScannerQ7- Complete and balance the following equations > NaySO, +H20 ——> CaC0;+H20 a) NaOH b) Ca(OH)2*... Q8-Fill in the blanks- 8) Chemical equations are balanced to satisfy the law of. b) A solution made in water is known as an. symbol. Q9- Give an example of a chemical reaction. Q10-Give two characteristics of the chemical reaction which takes place when dilute sulphuric acid is poured over zine granules. 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