10th Class PS 4th Lesson Corbon and it's Compounds Questions and Answers (InTextbook)
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Question 1.
What would be the electron dot the formula CO2?
Answer:
Question 2.
What would be the electron dot structure of a molecule of sulphur which is made up of eight atoms of sulphur?
Answer:
Question 3.
How many structural isomers can you draw for pentane ?
Answer:
We can draw three structural isomers of pentane (C5H12)
Question 4.
What are the two properties of carbon, which lead to the huge number of carbon compounds we see around us ?
Answer:
Catenation and tetravalency.
Question 5.
What will be the formula and electron dot structure of cyclopentane ?
Answer:
Question 6.
Draw the structures for the following compounds,
i) Ethanoic acid
ii) Bromopentane
iii) Butanone
iv) Hexanal.
Are structural isomers possible for bromopentane ?
Answer:
Yes, structural isomers are possible for bromopentane.
Question 7.
How would you name the following compounds ?
i) CH3 – CH2 – Br
Answer:
i) Bromoethane
ii) Methanal
iii) 1 – Hexyne
Question 8.
Why is the conversion of ethanol to ethanoic acid an oxidation reaction ?
Answer:
Since the conversion of ethanol to ethanoic acid involves the addition of oxygen to ethanol, it is an oxidation reaction.
Question 9.
A mixture of oxygen and ethyne is burnt for welding. Can you tell why a mixture of ethyne and air is not used?
Answer:
Ethyne with oxygen gives enough heat can be used for welding whereas if it is burnt in air which contains nitrogen and other inactive gaseous contents, sufficient oxygen is not available for burning ethyne to give the required heat.
Question 10.
How would you distinguish experimentally between an alcohol and a carboxylic acid ?
Answer:
Test | Alcohol | Carboxylic acid |
1) Litmus test | No change in colour | Blue litmus solution turns red |
2) Sodium carbonate | No action | Brisk effervescence is produced |
3) Sodium metal test | H2 is given out with effervescence | H2 is produced but no effervescence |
Question 11.
What are oxidising agents ?
Answer:
Those substances which give oxygen or replace hydrogen on reaction with other compounds are known as oxidising agents. For example, potassium permanganate (KMnO4.)
Question 12.
Would you be able to check if water is hard by using a detergent ?
Answer:
No, because detergent is equally effective in hard water as well as soft water.
Question 13.
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?
Answer:
Soap is able to remove dirt from clothes only in thin layers. Therefore, agitation or some similar activity is necessary so that totcil dirt is removed in layers of miscelles on continuous agitation and washing.
