1. Write the chemical equation for …

1. Write the chemical equation for reactions that takes place when lead nitrate and potassium iodide solutions are mixed. 2. Convert the following statements into balanced chemical equations: i Zinc reacts with sulphuric acid to form zinc sulphate and hydrogen gas. ii Magnesium burns in oxygen to form magnesium oxide. 3. What is redox reaction? Indentify the substance oxidised and the substance reduced in the reactions. i 2- ?? + ? ⟶ 2- ? + ??? ii ?? + 4?? ⟶ ? ? + 2??? + ? ? 4. What happens when: i Dilute hydrochloric acid is added to solid sodium carbonate. ii Quicklime is treated with water. iii Sodium chloride solution is added to lead nitrate solution. Also write the chemical equation in each case. 5. Identify the type of chemical reaction in the following statements and define each of them: a) Digestion of food in our body. b) Rusting of iron. c) Heating of manganese dioxide with aluminium powder. d) Blue colour of copper sulphate solution disappears when iron fillings are added to it. e) Dilute hydrochloric acid is added to sodium hydroxide solution to form sodium chloride and water. 6. Some articles made of silver, copper and iron get coloured coating over them when they are exposed to air Identify the colour and chemical name of the substance of coating in each case. 7. (a) Write one equation each for decomposition reaction when energy is supplied in the form of (i) Heat (ii) Light (b) Account for the following: (i) Paint is applied on iron articles. (ii) Oil and fat containing food items are flushed with nitrogen. (iii) When an iron nail is kept in Copper Sulphate solution, blue colour of the solution fades and iron nails becomes brownish. Chaper-2 (Acids, Bases And Salts) 8. Fresh milk has a pH of 6. When it changes into curd (yogurt) will its pH value increase or decrease? Why? 9. HCl and HNO3 show acidic characteristics in aqueous solution while alcohol and glucose solutions do not. Give reasons. 10. Write the chemical name and formula of gypsum. What happens when gypsum is heated at 373K. Write chemical equation for the reaction. 11. (i) Write the name given to bases that are highly soluble in water. Give an example. (ii) How is tooth decay related to pH? How can it be prevented? (iii) Why does bee-sting cause pain and irritation? Rubbing of baking soda on the sting area gives relief. How? 12. (i) How chloride of lime chemically differs from calcium chloride? (ii) What happens when Chloride of lime reacts with sulphuric acid? Write chemical equation involved. (iii) Mention two uses of chloride of lime. 13. Give suitable reasons for the following statements: (i) Rain water conducts electricity but distilled water does not. (ii) We feel burning sensation in the stomach when we over eat. (iii) A tarnished copper vessel regains its shine when rubbed with lemon. (iv) The crystals of washing soda change to white powder on exposure to air. (v) An aqueous solution of sodium chloride is neutral but an aqueous solution sodium carbonate is basic. 14. (i) Write the chemical name and chemical formula of washing soda. (ii) How is it obtained from sodium chloride? Give equations of the reaction. Why is it called a basic salt? Give its anyone use. Chaper-3 (Metals and Non-Metals) 15. Make a distinction between metals and non-metals with respects to the nature of their oxide. 16. A metal is found in liquid state. It is widely used in instrument for measuring blood pressure. In what form does it occur in nature? How can we extract this metal from is ore?

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