Thursday 28th March 2024
REGISTRATION
Online Fashion Store

CBSE Important Questions

CBSE Guess > Papers > Important Questions > Class X > 2010 > Science > Science By Mr. Pushpender

CBSE CLASS X

Q. 1. Name the functional group present in the compound CH3NH2 and name it. (1 mark)

Q. 2. Write the name and chemical formula of the organic acid present in vinegar. (1 mark)

Q. 3. A compound has molecular formula C2H6O. It is usable as a fuel. Name it. (1 mark)

Q. 4. An organic compound A on heating with acetic acid and conc. Sulphuric acid gave a pleasant smelling compound B. What is the nature of compound A? (1 mark)

Q. 5. How is ethanol prepared from ethane? Write the chemical equation for the reaction involved. What is meant by denatured alcohol? What is the need to denature alcohol? (2 marks)

Q. 6. What is the unique property of carbon atom? How is this property helpful to us? (2 marks)

Q. 7. Complete and balance the following equations: (2 marks)

  1. C2H5OH + O2Combustion
  2. C2H5OH+O2Oxidation
  3. C2H4 + H2OH3 PO 4
  4. CH3COOH + CH3OH

Q. 8. An organic compound A of molecular formula C2H6O on oxidation gives an acid with the same number of carbon atoms as in the molecule A. Compound A is often used for sterilization of skin by doctors. Name the compound A and B. Write the chemical equation involved in the formation of B from A. (2 marks)

Q. 9. Give reasons: (2 marks)

  1. Common salt (sodium chloride) is added during the preparation of soap.
  2. Soap is not suitable for washing clothes when the water is hard.

Q. 10. Explain the nature of the covalent bond using the bond formation is CH3Cl. (3 marks)

Q. 11.

  1. Write the chemical equation representing the preparation reaction of ethanol from ethane.
  2. Name the product obtained when ethanol is oxidized by either chromic anhydride or alkaline potassium permanganate.
  3. Give an example of an etherification reaction. (3 marks)

Q. 12.

  1. What are the two properties of carbon which lead to he formation of a large number of carbon compounds?
  2. What is a homologous series? Explain with an example. By how many carbon atoms and hydrogen atoms do any two adjacent homologous differ?
  3. Give a test that can be used to differentiate chemically between butter and cooking oil. (5 marks)

Paper By Pushpender
Email Id : [email protected]