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Posted By: prasanna Member Level: Gold Posted Date: 25 May 2008
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2005 CBSE chemistry Question paper
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Class X Chemistry
1. What is the effect of an increase in temperature on the rate of a chemical reaction?
Answer :
2. Name the functional groups present in:
(a) CH3COOH
(b) CH3COCH3
Answer :
3. Why are Zirconium, Titanium and Chromium classified as strategic metals?
Answer :
4. Explain giving reasons:
(a) Tartaric acid is a component of baking powder used in making cakes. (b) Gypsum, CaSO4.2H2O is used in the manufacture of cement.
Answer :
5. When a copper wire is left in silver nitrate solution, it is observed that the solution turns bluish green.
(a) Explain this observation.
(b) Write the balanced chemical equation to represent the change taking place.
Answer :
6. (a) Name the product formed when methanol undergoes controlled oxidation. (6) Describe with necessary chemical equations the test you would perform to identify the above product.
© Name the compound formed when ethanoic acid reacts with ethanol in the presence of concentrated sulphuric acid.
Or
(a) Propanone can be manufactured from Cumene. Write the corresponding chemical equation.
(b) Name the compound formed when propanone is reduced. Which reducing agent is generally used in this process?
© How is propanone converted to ethanoic acid?
Answer :
7. An aqueous solution has hydrogen ion concentration,
[H+] = 1.0 x 10-10 mol L-1
(a) Determine the pH of this solution.
(b) Is the solution acidic, basic or neutral?
© Will the pH of the above solution increase or decrease on adding a drop of 1M HC1 to it?
Answer :
8. (a) Draw a flow diagram illustrating the principle used in the manufacture of ammonia by Haber process.
(b) Describe an activity to show that ammonia is basic and is highly soluble in water.
Answer :
9. Explain giving reasons:
(a) Detergent made up of molecules in which branching is minimum are preferred these days.
(b) In the manufacture of condensation polymers, each monomer should have at least two reactive sites. Why? Cite an example to support your answer.
Answer :
10. Name the lightest element. Why is its presence in the free state in the earth’s atmosphere negligible? With a labelled diagram, describe how this element can be prepared in the laboratory. How is this element used in: (a) Space programmes
(b) Oil industry?
Or
(a) Name the chief ore of iron. How is it concentrated?
(b) Describe the extraction of iron from the concentrated ore with the help of
(i) a labelled diagram of the furnace used.
(ii) Necessary chemical equations representing the chemical changes occurring during the process.
© How is the conversion of iron into iron oxide prevented during the extraction of iron?
Answer :
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