Question

1. What do you mean by endothermic and exothermic reactions? Give suitable example for each.

2. 18.What is redox reaction? Identify the substance oxidised and the substance reduced in the following reactions:

(i) 2PbO + C --→ 2Pb + CO2

(ii) MnO2 + 4HCl -------> MnCl2 + 2H2O+ Cl2

3. a. Write one example for each of the decomposition reaction carried out with the help of (i) Electricity (ii) Heat (iii) Light

  b. Which of the following statements is correct and why? Copper can displace silver from the solution of silver nitrate and silver can displace copper from solution of copper sulphate.

4. What is observed when a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube? What type of reaction is this? Write a balanced chemical equation to represent the above chemical reaction?

5. What is a Thermite Reaction? Explain with the Help of an Equation. State One Use of this Reaction.

6. Complete the following chemical equations.

a) 2Na(s) + S(s) ----------> _____________



b) Pb(s) + CuCl2 ----------> ______________ +Cu(s)



c) 2AI(s) + ________ ----------> _____________ + 3Cu(s)



d) AgNO3 + NaCl ------------> ____________+NaNO3



e) __________ + _________ -------------> 2NaCl(s)



f) BaCl2 + H2SO4 --------------> __________ _ + 2HCl



g) Fe3O4 + 4H2 ------------> __________+ 4H2O



h) ________ + 2O2 -------------> CO2 + 2H2O



i) FeSO4 + Heat ----------> ___________________ + ___________



j) 2AgBr + Light -------------> ___________+ ___________


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Answer 1

Answer:

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