1. What are oxidising agents?
2. How would you distinguish experimentally between an alcohol and a carboxylic acid?
3. Would you be able to check if water is hard by using a detergent?
4. What is a homologous series? Explain with an example.
5. How can ethanol and ethanoic acid be differentiated on the basis of their physical and chemical properties?
6. Which of the following hydrocarbons undergo addition reactions:
C2H6, C3H8, C3H6, C2H2 and CH4.
7. Give a test that can be used to differentiate chemically between butter and cooking oil.
8. What were the limitations of Döbereiner’s classification?
9. Besides gallium, which other elements have since been discovered that were left by Mendeléev in his Periodic Table? (any two)
10. Why do you think the noble gases are placed in a separate group?
11. Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
12. In the Modern Periodic Table, which are the metals among the first ten elements?
13. In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21 and 38. Which of these have physical and chemical properties resembling calcium?
14. Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?
15. What criteria do we use to decide whether something is alive?
16. What are outside raw materials used for by an organism?
17. What processes would you consider essential for maintaining life?
18. What are the differences between autotrophic nutrition and heterotrophic nutrition?
19. How is the small intestine designed to absorb digested food?
20. What are the different ways in which glucose is oxidised to provide energy in various organisms?
21. How are the lungs designed in human beings to maximise the area for exchange of gases?
22. Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds?
23. What are plant hormones?
24. How do auxins promote the growth of a tendril around a support?
25. Why is the use of iodised salt advisable?
26. Why are some patients of diabetes treated by giving injections of insulin?
27. How does phototropism occur in plants?
28. How does chemical coordination occur in plants?
29. What is the difference between the manner in which movement takes place in a sensitive plant and the movement in our legs?
30. How are involuntary actions and reflex actions different from each other?
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