Class 10 Science Chapter 4 Carbon and its compounds The answer to each chapter is provided in the list so that you can easily browse throughout different chapters NCERT Class 10 Science Chapter 4 Carbon and its compounds and select need one.
Class 10 Science Chapter 4 Carbon and its compounds
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Multiple choice questions
Q.1. Buckminsterfullerene is an allotropic form of the element :
(a) Phosphorus.
(b) Fluorine.
(c) Carbon.
(d) Sulfur.
Ans :- (C) Carbon.
Q.2. Out of the following pairs of compounds, the unsaturated compounds are :
(a) C₂H₆ and C₄H₆
(b) C₆H₁₂ and C₅H₁₂
(c) C₄H₆ and C₆H₁₂
(d) C₂H₆ and C₄H₁₀
Ans :- (c) C₄H₆ and C₆H₁₂
Q.3. The number of covalent bonds in pentane is :
(a) 5
(b) 12
(c) 17
(d) 16
Ans :- (d) 16
Q.4. The properly of self – combination of the atoms of the same element to form long chains is known as :
( a ) Protonation.
( b ) Carbonation.
( c ) Coronation.
( d ) Catenation.
Ans :- ( d ) Catenation .
Q.5. A cyclic hydrocarbon having carbon – carbon single bonds as well as carbon – carbon double bonds in its molecule is
( a ) C₆H₁₂
( b ) C₆H₁₄
( c ) C₆H₆
( d ) C₆H₁₀
Ans :- ( c ) C₆H₆
Q.6. The hydrocarbon 2 – methylbutane is an isomer of
( a ) N – pentane.
( b ) N – butanes.
( c ) Propane.
( d ) Iso – butane.
Ans :- ( a ) N – pentane.
Q.7. An unsaturated hydrocarbon having a triple co – valent bond has 50 hydrogen atoms in its molecule . The number of carbon atoms in its molecule will be
( a ) 24
( b ) 25
(c) 26
( d ) 28
Ans :- ( c ) 26
Q.8. An alkyne has seventy five carbon atoms in its molecule . The number of hydrogen atoms in its molecule will be
( a ) 150
( b ) 148
( c ) 152
( d ) 146
Ans :- ( b ) 148
Q.9. A diamond toothed saw is usually used for cutting
( a ) Stell girders.
( b ) Logs of wood.
( c ) Marble slabs.
( d ) Asbestos sheets.
Ans :- ( c ) Marble slabs.
Q.10. The organic compound prepared by Worker from an inorganic compound called ammonium cyanate was
( a ) Glucose.
( b ) Urea.
( c ) Uric acid.
( d ) Vinegar.
Ans :- ( b ) Urea.
Q.11. One of the following is not an allotrope of carbon . This is –
( a ) Diamond.
( b ) Graphite.
( c ) Cumene.
( d ) Buckminsterfullerene.
Ans :- ( c ) Cumene .
Q.12. The number of carbon atoms in the organic compound named as 2 , 2 , dimethylpropane is :
( a ) Two.
( b ) Five.
( c ) Three.
( d ) Four.
Ans :- ( b ) Five.
Q.13. The pair of elements which exhibits the property of catenation is
( a ) Sodium and silicon.
( b ) Chlorine and carbon.
( c ) Carbon and sodium.
( d ) Silicon and carbon.
Ans :- ( d ) Silicon and carbon .
Q.14. A saturated hydrocarbon has fifty hydrogen atoms in its molecule . The number of carbon atoms in its molecule will be :
( a ) 25
( b ) 24
( c ) 26
( d ) 27
Ans :- ( b ) 24.
Q.15 . A hydrocarbon having one double bond has 100 carbon atoms in its molecule . The number of hydrogen atoms in its molecule will be :
( a ) 200
( b ) 198
( c ) 202
( d ) 196
Ans :- ( a ) 200.
Q.16. The hydrocarbon which has alternate single and double 2 bonds arranged in the form of a ring is :
( a ) Cyclobutane.
( b ) Benzene.
( c ) Butene.
( d ) Hexene.
Ans :- ( b ) Benzene.
Q.17. Which of the following can not exhibit isomerism ?
( a ) C₄H₁₀
( b ) C₅H₁₂
( c ) C₃H₈
( d ) C₆H₁₄
Ans :- ( c ) C₃H₈
Q.18. The pencil leads are mainly made of :
( a ) Lithium.
( b ) Charcoal.
( c ) Lead.
( d ) Graphite.
Ans :- ( d ) Graphite.
Q.19. The number of isomers formed by the hydrocarbon with molecular formula C₅H₁₂ is
( a ) 2
( b ) 5
( c ) 3
( d ) 4
Ans :- ( c ) 3.
Q.20. The number of carbon atoms joined in a spherical molecules of buckminsterfullerene is –
( a ) 50
( b ) 60
( c ) 70
( d ) 90
Ans :- ( b ) 60.
Q.21. The molecular formula of a homologue of butane is
( a ) C₄H₈
( b ) C₂H₆
( c ) C₄H₆
( d ) C₃H₈
Ans :- ( d ) C₃H₈
Q.22. One of the following molecular formula can represents two organic compounds having different functional groups . This molecular formula is :
( a ) C₅H₁₂O
( b ) C₅H₁₀O
( c ) C₅H₁₀O₂
( d ) C₅ H₁₂
Ans :- ( b ) C₅H₁₀O
Q.23. The number of carbon atoms present in the molecule of fifth member of the homologous series of alkynes is
( a ) Four.
( b ) Five.
( c ) Six.
( d ) Seven.
Ans :- ( c ) Six.
Q.24. One of the following burns without producing flame. This is :
( a ) Wood.
(b) Charcoal.
(c) LPG.
(d) Candle.
Ans :- (b) Charcoal.
Q.25. The functional group which always occurs in the middle of a carbon chain as :
( a ) Alcohol.
(b) Aldehyde group.
(c) Carboxyl group.
(d) ketone group.
Ans :- (d) ketone group.
Q.26. The molecular formula of some organic compounds are given below. Which of these compounds contains an aldehyde group ?
( a ) C₃H₈O
(b) C₃H₆O₂
(C) C₃H₆O
(d) C₃H₇CI
Ans :- (c) C₃H₆O
Q.27. The organic compounds which are isomeric with one another are :
( a ) Alcohols and aldehydes.
(b) Aldehydes and carboxylic acids.
(c) ketenes and aldehydes.
(d) Alcohols and ketenes.
Ans :- (c) Ketones and aldehydes.
Q.28. The fuel which usually burns with a blue flame is
(a) Coal.
(b) LPG.
(c) Candle wax.
(d) kerosene (in lamp).
Ans :- (b) LPG.
Q.29. Which of the following burns by producing a yellow, luminous flame ?
( a ) Natural gas.
( b ) Coke.
( c ) Wax.
( d ) Charcoal.
Ans :- ( c ) Wax.
Q.30. The molecular formula of an organic compound is C₄₈H₉₄. This compound belongs to the homologous series of :
( a ) Alkenes.
( b ) Aldehydes.
( c ) Alkynes.
( d ) Alkaness.
Ans :- Alkynes.
Q.31. One of the following molecular formule represents as ketone . This formula is :
( a ) C₅H₁₂O
( b ) C₆H₁₂O
( c ) C₆H₁₄O
( d ) C₆H₁₂O
Ans :- ( d ) C₆H₁₂O
Q.32 . Which one of the following in not a fossil fuel ?
( a ) Petrol.
( b ) Coal.
( c ) Charcoal.
( d ) Coal.
Ans :- ( c ) Charcoal.
Q.33 . Butanone is a four carbon compound having the functional group :
( a ) -COOH
( b ) -CHO
( c ) -CO-
( d ) -OH
Ans :- ( c ) -CO-
Q.34. The molecular formula of the third member of the homologous series of ketones is :
( a ) C₄H₈O
( b ) C₃H₆O
( c ) C₅H₁₀O
( d ) C₆H₁₂O
Ans :- ( c ) C₅H₁₀O
Q.35. The functional group present in propanal is :
( a ) -OH
( b ) -COOH
( c ) -CO-
( d ) -CHO
Ans :- ( d ) -CHO
Q.36. While cooking , if the bottom of the utensil is getting blackned on the outside , it means that :
( a ) The food is not cooked completely.
( b ) The fuel is not burning completely.
( c ) The fuel is wet U
( d ) The fuel is burned completely .
Ans :- ( b ) The fuel is not burning completely.
Q.37. When ethanol is heated with alkaline potassium permanganate solution , it gets converted into ethanoic acid . In this reaction alkaline potassium permanganate bay act as :
( a ) Reducing agent.
( b ) Oxidising agent.
( c ) Catalyst sa ozbr.
( d ) Dehydrating agent.
Ans :- ( b ) Oxidising agent.
Q.38. When ethanol is heated with concentrated sulphuric acid at 170° C, it gets converted into ethene . In this reaction concentrated sulphuric acid acts as :
( a ) Oxidising agent.
( b ) Catalyst.
( c ) Dehydrating agent.
( d ) Reducing agent.
Ans :- ( c ) Dehydrating agent .
Q.39. When a vegetable oil is treated with hydrogen in the presence of nickel catalyst , it forms a fat . This is an example of :
( a ) Anodising reaction .
( b ) Substitution reactions.
( c ) Displacement reaction.
( d ) Addition reaction.
Ans :- ( d ) Addition reaction.
Q.40. The soap molecule has a :
( a ) Hydrophilic head and a hydrophobic tail.
( b ) Hydrophobic head and hydrophilic tail.
( c ) Hydrophobic head and hydrophobic tail
( d ) Hydrophilic head and hydrophilic tail .
Ans :- ( a ) Hydrophilic head and a hydrophobic tail.
Q.41. Chlorine reacts with saturated hydrocarbons at room temperature in the :
( a ) Absence of sunlight.
( b ) presence of sunlight.
( c ) Absence of moisture.
( d ) Presence of H₂SO₄
Ans :- ( b ) Presence of sunlight.
Q.42. In a soap micelle , the soap molecules are arranged radially with :
( a ) Ionic ends directed towards the centre and hydrocarbon ends directed out wards.
( b ) Hydrocarbon ends directed towards the centre and ionic ends directed outwards.
( c ) Both ionic ends and hydrocarbon ends directed towards the centre.
( d ) both hydrocarbon ends and ionic ends directed outwards.
Ans :- ( b ) Hydrocarbon ends directed towards the centre and ionic ends directed outwards.
Q.43. When ethanol reacts with sodium metal , it forms two products . These products are :
( a ) Sodium ethanoate and oxygen.
( b ) Sodium ethanoate and hydrogen.
( c ) Sodium ethoxide and oxygen.
( d ) Sodium ethoxide and hydrogen .
Ans :- ( d ) Sodium ethoxide and hydrogen.
Q.44. Vinegar is a solution of about
( a ) 5 to 8 percent ethanoic acid in alcohol.
( b ) 5 to 8 percent ethanoic acid in water.
( c ) 50 to 80 percent ethanoic acid in water.
( d ) 50 to 80 percent ethanoic acid in alcohol.
Ans :- ( b ) 5 to 80 percent ethanoic acid in water .
Q.45. One of the following substance is not added to make denatured alcohol . This is
( a ) Methyl alcohol.
( b ) Copper sulphate.
( c ) Chloroform.
( d ) Pyridine dam.
Ans :- ( c ) Chloroform.
Q.46. One of the following organic compounds cannot decolourise the red – brown colour of bromine water . This compound is
( a ) C₁₄H₂₈
( b ) C₇H₁₂
( c ) C₆H₁₄
( d ) C₉H₁₆
Ans :- ( c ) C₆H₁₄
Q.47. The substance which can produce brisk effervescence with baking soda solution is –
( a ) Ethanol.
( b ) Vegetable oil.
( c ) Vinegar.
( d ) Common Salt.
Ans :- ( c ) Vinegar.
Q.48. The chemical which is not required for the preparation of soap in the laboratory is :
( a ) Vegetable oil.
( b ) Baking soda.
( c ) Caustic soda.
( d ) Common salt.
Ans :- ( b ) Baking soda .
Q.49. Which of the following can damage optic nerve leading to blindness , if taken internally ?
( a ) CH₃ COOH
( b ) C₂H₅OH
( c ) NaHCO₃
( d ) CH₃ OH
Ans :- ( d ) CH₃ OH
Q.50. The usual disease caused by the excessive drinking alcohol over a long period of time is :
( a ) Diabetes.
( b ) Cataract.
( c ) Cirrhosis.
( d ) Arthritis.
Ans :- ( c ) Cirrhosis.
Q.51. Which of the following molecular formula corresponds to ethyl butanoate ester ?
( a ) C₅H₁₀O₂
( b ) C₆H₁₂O₂
( c ) C₇H₁₄O₂
( d ) C₈H₁₈O₂
Ans . ( b ) C₆H₁₂O₂
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