age No 61:
Question 1:
What would be the electron dot structure of carbon dioxide which has the formula CO2?
Page No 61:
Question 2:
What would be the electron dot structure of a molecule of sulphur which is made up of eight atoms of sulphur? (Hint − the eight atoms of sulphur are joined together in the form of a ring.)
Page No 68:
Question 2:
What are the two properties of carbon which lead to the huge number of carbon compounds we see around us?
Page No 69:
Question 4:
Draw the structures for the following compounds.
(i) Ethanoic acid (ii) Bromopentane*
(iii) Butanone (iv) Hexanal
*Are structural isomers possible for bromopentane?
Page No 71:
Question 1:
Why is the conversion of ethanol to ethanoic acid an oxidation reaction?
Page No 71:
Question 2:
A mixture of oxygen and ethyne is burnt for welding. Can you tell why a mixture of ethyne and air is not used?
Page No 74:
Question 1:
How would you distinguish experimentally between an alcohol and a carboxylic acid?
Page No 76:
Question 2:
People use a variety of methods to wash clothes. Usually after adding the soap, they ‘beat’ the clothes on a stone, or beat it with a paddle, scrub with a brush or the mixture is agitated in a washing machine. Why is agitation necessary to get clean clothes?
Page No 78:
Question 7:
How can ethanol and ethanoic acid be differentiated on the basis of their physical and chemical properties?
Page No 78:
Question 8:
Why does micelle formation take place when soap is added to water? Will a micelle be formed in other solvents such as ethanol also?
Page No 78:
Question 11:
What change will you observe if you test soap with litmus paper (red and blue)?
Which of the following hydrocarbons undergo addition reactions:
C2H6, C3H8, C3H6, C2H2 and CH4.