CBSE Guess > Papers > Important Questions > Class X > 2008 > Science > Science By :- Nagesh Kumar

Science - Carbon and its Compounds

1. What is meant by a functional group in an organic compound?
2. Which of the following would yield an unsaturated hydrocarbon on cracking : C₆H₁₄, C₂H₆, C₂H₄?
3. Name the products formed when methane burns in :
    (a) Sufficient supply of air.
    (b) Insufficient supply of air.
   Write the chemical equations for above reactions.
4. How is an ester prepared in the lab? Write its one use in daily life.
5. With the help of a labelled diagram explain how methane is prepared in the laboratory. Explain with the help of chemical equation. Why it is dangerous to burn methane in insufficient supply of air?
6. What is the optimum temperature for fermentation?
7. Why are carbon and its compounds used as fuels for most application?
8. What is hydrogenation?
9. What are synthetic detergents? Give one example of synthetic detergent. Write its two advantages over soap.
10. Compound 'A' is obtained from wood-tar distillation. It has specific smell and burning taste. It burns with blue flame to give CO₂ and H₂O. It is soluble in water. It is used as a fuel and solvent. It reacts with sodium metal and gives out hydrogen gas. It reacts with acetic acid to form pleasant fruity smelling compound 'B' in presence of concentrated H₂SO₄. Identify 'A' and 'B' and give equations for all the reactions involved.
11. What is fermentation? How is ethanol prepared by fermentation? Give two uses of ethyl alcohol. What are the harmful effects of drinking alcohol?
12. What are the saturated hydrocarbons?
13. What is fermentation?
14. Name the type of compounds which give fruity smell.
15. What change will you observe if you test soap with a litmus paper (red and blue)?
16. Name one alcohol which is poisonous.
17. What substances are added to ethanol to make it unfit for drinking purposes?
18. Which of the following hydrocarbon undergo addition reactions: C₂H₆,   C₃H₈, C₃H₆, C₂H₂, and CH₄?