Assignment – 1

Chemical Reactions and Equations

1. Identify the type of chemical reaction
 
         
        

2. Why does not silver evolve hydrogen on reacting with dil H2SO4?

3. Why do diamond and graphite, the two allotropic forms of carbon evolve different amounts of heat on combustion?

4. What is the role of oxidizing agent is a reaction?

5. What happens chemically when quick lime is added to water?

6. Why a combustion reaction an oxidation reaction?

7. Why are food particle preferably packed in aluminium foil?

8. What happens to lime water when Co2 gas is bubbled through it in excess?

9. Why is a Combustion reaction an oxidation reaction?

10. Identify the type of chemical reaction
             
     



11. Why cannot a chemical change be normally reversed?

12. Identify the substance oxidized and reduced in the reaction.
                  
13. A student took 23 g of a substance X in a glass beaker & poured water over it slowly. He observed bubbles along with hissing noise. The beaker becomes quite hot. Identify X. What type of reaction is it?

14. A substance X used for coating iron articles is added to a blue solution of a reddish brown metal Y,the color of the solution gets discharged Identify X and Y & also the type of reaction.

15. A student burnt a metal A found in the form of ribbon. The ribbon burnt with a dazzling Flame & a white powder B is formed which is basic in nature. Identify A & B. Write the Balanced chemical equation.



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