Read and download free pdf of CBSE Class 10 Science Carbon and its compounds Assignment Set B. Get printable school Assignments for Class 10 Science. Class 10 students should practise questions and answers given here for Chapter 4 Carbon And Its Compound Science in Class 10 which will help them to strengthen their understanding of all important topics. Students should also download free pdf of Printable Worksheets for Class 10 Science prepared as per the latest books and syllabus issued by NCERT, CBSE, KVS and do problems daily to score better marks in tests and examinations
Assignment for Class 10 Science Chapter 4 Carbon And Its Compound
Class 10 Science students should refer to the following printable assignment in Pdf for Chapter 4 Carbon And Its Compound in Class 10. This test paper with questions and answers for Class 10 Science will be very useful for exams and help you to score good marks
Chapter 4 Carbon And Its Compound Class 10 Science Assignment
Question. The soap molecule has a -
a) hydrophilic head and hydrophilic tail
b) hydrophobic head and hydrophilic head
c) hydrophobic head and hydrophobic tail
d) hydrophilic head and hydrophobic tail
Answer : D
Question. Identify the unsaturated compounds from the following
(i) Propane (ii) Propene (iii) Propyne (iv) Chloropropane
(a) (i) and (ii)
(b) (ii) and (iv)
(c) (iii) and (iv)
(d) (ii) and (iii)
Answer : D
Question. The functional group present in propanal is
a) -OH
b) -COOH
c) -CO-
d) -CHO
Answer : D
Question. Buckminsterfullerene is an allotropic form of
(a) phosphorus
(b) sulphur
(c) carbon
(d) tin
Answer : C
Question. Which of the following statements are usually correct for carbon compounds? These
(i) are good conductors of electricity
(ii) are poor conductors of electricity
(iii) have strong forces of attraction between their molecules
(iv) do not have strong forces of attraction between their molecules
(a) (i) and (iii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (ii) and (iv)
Answer : D
Question. When vegetable oil is treated with hydrogen in the presence of nickel
Or (Palladium) as a catalyst, it forms vegetable ghee. This process shows
a) Anodising reaction
b) Substitution reaction
c) Displacement reaction
d) Addition reaction
Answer : D
Question : The structural formula of ethyl ethanoate
Answer : B
Question : The compound which gives a brisk effervescence with sodium metal and not with sodium hydrogen carbonate is
(a) ethanol
(b) ethanoic acid
(c) both ethanoic acid and ethanol
(d) none of these
Answer : A
Question : Which is denatured spirit?
(a) ethanol only
(b) ethanol and methanol (50%)
(c) ethanol and methanol (5%)
(d) methanol only
Answer : C
Question : Drinking alcohol and driving may cause serious accidents. To discourage this, police randomly test drivers for alcohol using a breath analyser. The breath analyser works because
(a) Alcohol makes the breath dry and the machine registers moisture
(b) Alcohol makes the breath hotter which changes the machine reading
(c) Alcohol causes more saliva which the machine checks.
(d) Alcohol in the breath cause a chemical change registered by the machine.
Answer : B
Question : The by product of soap is
(a) isoprene
(b) glycerol
(c) butene
(d) ethylene glycol
Answer : B
Question : Tertiary butane gets oxidised with oxidising agents like alkaline KMNO4 to
(a) Isobutane
(b) Ter-butyl alcohol
(c) Secondary-propyl alcohol
(d) All of above
Answer : B
Question : According to IUPAC system, the correct name of the organic compound is
(a) 2-bromobutanoic acid
(b) 2-bromobutysis acid
(c) 3-bromobutanoic acid
(d) 3-bromo-2-hydroxybutan-2-one
Answer : C
Question : The substance not responsible for the hardness of water is
(a) sodium nitrate
(b) calcium hydrogen carbonate
(c) calcium carbonate
(d) magnesium carbonate
Answer : A
Question : The isomeric pair is
(a) ethane and propane
(b) propane and butane
(c) ethane and ethane
(d) butane and 2-methyl propane
Answer : D
Question : Soaps are formed by saponification of
(a) alcohols
(b) glycosides
(c) simple esters
(d) carboxylic acids
Answer : D
Question : Identify the product formed when methane reacts with chlorine in the presence of sunlight is
(a) C2Cl6
(b) CH3Cl
(c) CHCl4
(d) None of these
Answer : B
Question : Covalent compounds
(a) have high melting and boiling points
(b) are mostly soluble in water
(c) are formed between atoms of metals and non-metals
(d) are formed by the sharing of electrons in the bonding atoms.
Answer : D
Question : Vinegar is a solution of
(a) 30% – 40% acetic acid in alcohol
(b) 5% – 8% acetic acid in alcohol
(c) 5% – 8% acetic acid in water
(d) 15% – 20% acetic acid in water
Answer : C
Question : Which of the following can be used for the denaturation of ethyl alcohol?
(a) Methyl alcohol
(b) Pyridines
(c) Copper sulphate
(d) All of above
Answer : D
Question : The correct electron dot structure of a water molecule is
Answer : C
Question : Acetic acid was added to a liquid X kept in a test tube. A colourless and odourless gas Y was evolved. The gas was passed through lime water which turned milky. It was concluded that:
(a) Liquid X is sodium hydroxide and the gas Y is CO2
(b) Liquid X is sodium carbonate and the gas Y is CO2
(c) Liquid X is sodium acetates and the gas Y is CO2
(d) Liquid X is sodium chloride and the gas Y is SO2.
Answer : B
Very Short Answers
Question : Draw electron dot structure of carbon dioxide and write the nature of bonding between carbon and oxygen in its molecule.
Answer :
.. ..
:O: :C: :O : or O = C = C
.. ..
Covalent bond (double bond) is present in between C and O.
Question : List two properties of carbon which lead to the huge number of carbon compounds we see around us, giving reason for each.
Answer : Two properties of carbon which lead to the huge number of carbon compounds are :
(a) Catenation : It is the ability of carbon to form bonds with other atoms of carbon.
(b) Tetravalency : With the valency of four, carbon is capable of bonding with 4 other atoms.
This forms huge number of compounds.
Question : List two chemical properties on the basis of which ethanol and ethanoic acid may be differentiated and explain how. Unsaturated hydrocarbons contain multiple bonds between two carbon atoms and these compounds show addition reactions. Out of saturated and unsaturated carbon compounds, which compounds are more reactive ? Write a test to distinguish ethane from ethene.
Answer :
(a) Ethanol does not react with sodium bicarbonate but ethanoic acid reacts with sodium bicarbonate releasing CO2 gas.
(b) Ethanol does not change the colour of blue litmus paper but ethanoic acid changes the colour of blue litmus to red due to presence of carboxylic acid group. Unsaturated carbon compounds are more reactive than saturated carbon compounds. Bromine water is decolourized by ethene but there is not change of colour of bromine water with ethane.
Question : Carbon has four electrons in its valence shell. Which type of compounds can be formed by carbon atom and why ? Give any one example of such compounds.
Answer : Covalent compounds can be formed by carbon atom because carbon atom has 4 valence electrons, hence it is not able to gain four electrons or form C4– ion or lose four electrons or form C4+ ion to attain noble gas configuration. So, it shares electrons to form covalent bonds and the covalent compounds.
Example : CH4 (methane) compounds.
Question : In a school laboratory the students are studying the properties of ethanoic acid through certain experiments. How can they test its acidic nature ? Give two tests.
Answer :
(a) Blue litmus turns red.
(b) On adding solid sodium carbonate or sodium hydrogen carbonate, brisk effervescence is observed.
Question : If you add a few drops of acetic acid to a test tube containing (i) distillated water and (ii) aqueous solution of sodium hydrogen carbonate, what would you observe ? If a reaction takes place in any one of the above two cases, list its two observations.
Answer :
(a) No reaction with distilled water.
(b) Chemical reaction occurs with solution of NaHCO3.
Two observations are :
(i) Evolution of a colourless, odourless gas.
(ii) The gas is evolved with brisk effervescence.
Question : Write the molecular formula of (a) Methane and (b) Ethanol.
Answer :
(a) CH4 (b) C2H5OH or C2H6O
Question : You have four beakers A, B, C and D. Out of A and B one has hard water and the other has soft water. Out of C and D one has soap solution and the other has detergent-solution. How would you identify these liquids ?
Answer : On adding soap solution lather will be formed in the beaker containing soft water only. While On adding detergent solution lather will be formed by both hard and soft water in both the beakers.
Question : What do you observe when you add sodium bicarbonate to acetic acid ? How would you identify the gas released in the reaction ? Describe briefly.
Answer : A colourless gas with brisk effervescence will be evolved which turns the lime water milky. When this gas is passed through it.
Question : Write the molecular formula of (a) ethane and (b) ethanoic acid
Answer :
(a) C2H6
(b) CH3COOH
Question : Write the name of (a) CH4 and (b) CH3COOH.
Answer :
(a) Methane
(b) Ethanoic acid or Acetic acid
Short Answers
Answer : The essential chemicals required to prepare soap in the laboratory are oil and sodium hydroxide solution. In order to determine the nature of the reaction mixture of saponification reaction, we dip red litmus paper into it which will turn blue after a while indicating that it is a basic mixture.
Long Answers
Question : Name the compound form heating ethanol at 443 K with excess of conc.H2SO4.
Question : What happened when a small piece of sodium is dropped into ethanol ?
Question : Write the chemical equation for the decarboxylation of ethanoic acid?
Question : Give an example of esterification reaction.
Question : Name the product obtained when ethanol is oxidized by either chromic anhydride or alkaline potassium permanganate.
Question : Write the chemical equation repressing the preparation reaction of ethanol from ethane.
Question : Name the 2 elements which are present both in CNG and Petroleum
Question : Draw the electronic dot structure of ethane molecule (C2H6)
Question : Write the IUPAC name of the next homologous of CH3OHCH2CH3.
Question : Define homologous series of organic compounds series of organic compounds ,Mention any two characteristics of homologous series.
Question : Describe a chemical test to distinguish between ethanol and ethanoic acid.
Question : Give the name of functional groups (i)-CHO (ii) –C=0
Question : Why does carbon form compounds mainly by covalent bonding ?
Question : Give a chemical test to distinguish ethanol from ethanoic acid.
Question : Allotropy is a property shown by which class: substances elements compounds or mixtures ? give one examples of allotropy.
Question : How may be the following be obtained from ethanol ? express giving chemical equations. (i) Ethyl ethanoate (ii) Sodium ethoxide.
Question : Describe with chemical equation how ethanoic acid may be obtained from. (i) Ethanol (ii) Methanol
Question : Explain the cleansing action of soap
Question : Distinguish between esterification and saponification reactions of organic compounds 3.
Question : Explain the structure of graphite in term of bonding and give one property based on this structure.
Question : Name the organic acid present in vinegar .write a chemical equation which represents the commercial method for the preparation of this acid from methanol.
(HOTS) QUESTIONS:
Question : Why the colour of potassium permangante disappers,if it is added to warm solution of ethanol.
Question : An organic compound with molecular formula C2H4O2 produces brisk effervescence on addition of sodium carbonate /bicarbonate.
a .Identify the organic compound.
b. Name the gas evolved.
C. How will you test the gas evolved.
d. Write the chemical equation for the above reaction.
e. List two important uses of the above compound.
Question : a.What are the various possible structure formulae of a compound having molecular formula C3H6O .
b. Also give the IUPAC names of the above possible compounds.
c.What is the similarity in these compounds?
Question : A mixture of oxygen and ethyne is burnt for welding ,can you tell why a mixture of ethyne and air is not used .
Question : Two carbon compound A and B have molecular formula C3H8 and C3H6 respectively. Which one of the two is most likely to show addition .justify your answer .Explain with the help of a chemical equation ,how an addition reaction is used in vegetable ghee industry.
Question : 1ml glacial acetic acid and 1ml of ethanol are mixed together in a test tube. Few drops of concentrated sulphuric acid is added in the mixture are warmed in a water bath for 5 min.
a. Name the resultant compound formed.
b. Represent the above change by a chemical equation .
c.What term is given to such a reaction.
d. What are the special characteristics of the compound formed.
Question : An organic compound 'X‘with a molecular formula C2H6O undergoes oxidation in the presence of alkaline KMnO4 and forms the compound 'Y‘.
a. Identify 'X‘ and 'Y‘
b.Write your observation when the compound 'X‘ is made to react with compound 'Y‘ which is used as a preservative for pickles.
PUZZLE :
1. Compounds containing double and triple bonds.
2. A compound which is basic constituent of many cough syrups.
3. Very dilute solution of ethanoic acid.
4. A sweet smelling substance formed by the reaction of alcohol and carboxylic acids.
5. Gas released when sodium metal is dropped in ethanol.
6. The functional group present in methanol.
7. IUPAC name of alkene containing 3 carbon atoms.
8. The number of single covalent compounds present in pentane.
9. First member of homologous serious alkyne.
10. Simplest ketone.
11. Self linking property of carbon.
12. Product formed by dehydration of ethanol in conc. Sulphuric acid.
13. Alcohol whose intake in small quantities can be lethal.
14. Number of single covalent bounds in ammonia.
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