RBSE Class 10 Science Chemistry Chapter 4 Carbon and its Compounds MCQs (Objectives) are very important for students preparing for Board Exams. These MCQS have been prepared on the basis of important topics of Carbon and its Compounds
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In this post, you will find high- quality,
exam oriented MCQs with answers prepared according to the latest RBSE Class 10
Science syllabus.
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Carbon and its Compounds Objectives with Answers
Choose
the correct answer
1. The functional group present in methanal is
(a) −OH
(b)−CHO
(c) > C = O
(d)−COOH
Correct answer –(b)
2. The functional group present in propanone is
(a) −OH
(b)−CHO
(c) > C = O
(d)−COOH
Correct answer –(c)
3. Chlorine molecule is formed by a / an
(a) ionic bond
(b)single covalent bond
(c) double covalent bond
(d)triple covalent bond
Correct answer –(b)
Explanation- Each chlorine atom
shares one electron to form single covalent bond.
4. Which covalent compound is soluble in water
(a) methane
(b)ethane
(c) chlorine
(d)sugar
Correct answer –(d)
5. N2 molecule is formed by a / an
(a) ionic bond
(b)single covalent bond
(c) double covalent bond
(d)triple covalent bond
Correct answer –(d)
Explanation- Each nitrogen atom
shares three electron with another to form triple covalent bond
6.Oxidation of ethanol with alkaline potassium
permanganate;
produces
(a) CH3CHO
(b)CH3COOH
(c) CH3COCH3
(d)CH3COONa
Correct answer –(b)
Explanation- Acetic acid is formed
after oxidation of ethanol. There is increase in oxygen in acetic acid.
7. The general formula of alkane is
(a)
CnH2n
(b)
CnH2n+2
(c)
CnH2n-2
(d)
CnH2n-1
Correct answer –(b)
8. The hydrolysis of an ester in the presence of an
alkali, is
called
(a) fermentation
(b)hydration
(c) esterification
(d)saponification
Correct answer –(d)
Explanation- In this reaction, soap
is formed so it is called saponification.
9. Which of the following compounds can have a triple
bond?
(a)C4H6
(b)C3H6
(c) C3H4
(d) C3H8
Correct answer –(c)
Explanation- Propyne is an
unsaturated hydrocarbon that belobngs to alkyne series in which triple bond is
found between two carbon atoms.
10. The reaction of an alcohol with carboxylic acid in
the presence of H2SO4,
is called
(a) fermentation
(b)hydration
(c) esterification
(d)saponification
Correct answer –(c)
Explanation- Formation of esters
occurs in the reaction of alcohol with carboxylic acid so it called
esterification.
11.Consumption of alcohol in large quantities may
cause death by damaging
(a) heart
(b)brain
(c) lungs
(d)liver
Correct answer –(d)
12. Between two atoms, the bond formed by sharing of
electrons, is
(a) covalent bond
(b)hydrogen bond
(c) electrovalent bond
(d)co-ordinate bond
Correct answer –(a)
13. Which of the molecule has no double or triple
covalent bond
(a) O2
(b)N2
(c) H2O
(d)CO2
Correct answer –(c)
14. Which
compound is not soluble in water
(a) sodium bromide
(b)benzene
(c) calcium chloride
(d)sugar
Correct answer –(b)
Explanation-Benzene is an aromatic
hydrocarbon(organic compound). It is not soluble in water (polar solvent)
15.Which statement is correct about covalent
compounds?
(a) they are good
conductor of electricity
(b)the are soluble in water
(c) the molecules from
ions in solution
(d)their melting points
are low
Correct answer –(d)
Explanation- Covalent compounds have
weak bond between their atoms so they easily get melted.
16. Ethyl
ethanoate is formed, by the action of
(a) methanol and
methanoic acid
(b)methanol and ethanoic acid
(c) ethanol and methanoic
acid
(d)ethanol and ethanoic acid
Correct answer –(d)
17. The
functional group present in alcohol is
(a) −OH
(b)−CHO
(c) −COOH
(d)> C = O
Correct answer –(a)
18. Alcohols
produce hydrogen gas with
(a) Zn
(b)Fe
(c) AI
(d)Na
Correct answer –(d)
19. The
poisonous alcohol is
(a) Propanol
(b)Methanol
(c) Butanol
(d)Ethanol
Correct answer –(b)
20. Two adjacent members of homologous series has a
difference in mass
(a) 4 u
(b)8 u
(c) 10 u
(d)14 u
Correct answer (d)
21. When alcohols react with acidic potassium dichromate, they change to
(a) alkanes
(b)aldehydes
(c) esters
(d)carboxylic acids
Correct answer –(d)
22. The
functional group present in organic acids is
(a) −OH
(b)−CHO
(c) −COOH
(d)> C = O
Correct answer –(c)
23. When ethyl alcohol is heated with acetic acid, in
the presence of H2SO4
the product is
(a) aldehyde
(b)methyl acetate
(c) ethyl acetate
(d)acetic anhydride
Correct answer –(c)
24. Vegetable oils convert into vanaspati ghee by the
process of
(a) hydrogenation
(b)helogenation
(c) catenation
(d)oxidation
Correct answer –(a)
Explanation- In hydrogenation, Hydrogen
is added to vegetable oils in the presence of a catalyst.
25. When ethanoic acid is added to sodium carbonate
solution, gas evolved is
(a) H2
(b)N2
(c) CO2
(d)O2
Correct answer –(c)
26. When chlorine gas reacts with methane in the
presence of sunlight which is not
formed
(a) chloromethane
(b)methylene chloride
(c) chloroform
(d)acetyl chloride
Correct answer –(d)
27. A large
number of carbon compounds are formed due to
(a) the property of
halogenation
(b)the property of catenation
(c) the property of nitration
(d)the property of hydration
Correct answer –(b)
28.
n-pentane
and iso-pentane are
(a) two homologues of alkane series
(b)two isomers
(c) two isotopes
(d)two allotropes
Correct answer –(b)
29.
Soaps are
(a) sodium salts of
sulphonic-acids containing carbon atoms 10 to 16
(b) sodium salts of fatty acids containing carbon atoms 16 to 18
(c) sodium salts of
trihydoxy alcohols
(d)none of the above
Correct answer –(b)
30. Detergents
are sodium salts of
(a) unsaturated sulphonic
acids containing carbon atoms 10 to 16
(b)fatty acids containing carbon atoms 16 to 18
(c) tryhydroxy alcohols
(d)none of the above
Correct answer –(a)
31. Detergents
can lather well in
(a) soft water
(b) hard water
(c) river water
(d)all the above
Correct answer –(d)
32. Soaps can
lather well in
(a) soft water
(b) hard water
(c) sea water
(d)all the above
Correct answer –(a)
33. In C6H14,
the number of possible isomers is
(a) 3
(b) 6
(c) 4
(d)5
Correct answer –(d)
34. Heating of
kerosene soaked sand, is an example of
(a) refining
(b) separation
(c) cracking
(d) purification
Correct answer –(c)
35.If a hydrocarbon has all single carbon-carbon
bonds, it is
(a) alkyne
(b) alkane
(c) alkene
(d) all the above
Correct answer –(b)
36. If a
hydrocarbon has any double bond, it is
(a) alkyne
(b) alkane
(c) alkene
(d)all the above
Correct answer –(c)
37. If a
hydrocarbon has any triple double bond, it is
(a) alkyne
(b) alkane
(c) alkene
(d) all the above
Correct answer –(a)
38. Sodium
reacts with ethanol to form
(a) sodium ethanoate and
oxygen
(b) sodium methanoate
and oxygen
(c) sodium ethanoate and
hydrogen
(d) sodium methanoate
and hydrogen
Correct answer –(c)
39 Carbon
forms four covalent bonds by sharing its four valence electrons. In this way it
gets the electronic configuration similar to
(a) He
(b) Ne
(c) Xe
(d) Re
Correct answer –(b)
40.Which among
the following are unsaturated hydrocarbons:
(i) CH3−CH2−CH2−CH2−CH3
(ii) CH3−CH−CH2−CH2−CH3
⃒
CH3
(iii) CH3−CH
≡ CH−CH2−CH3
(iv) CH3−CH2−C
≡ C−CH3
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (ii) and (iv)
Correct answer –(c)
Explanation- Hydrocarbons having
double or triple bond two carbon atoms are known as unsaturated hydrocarbons.
41. Molecular formula of butane is C4H10, it has
covalent bonds
(a) 10
(b) 14
(c) 11
(d) 13
Correct answer –(d)
42. NH3
has
(a) only single bond
(b) single and double
bonds
(c) only double bonds
(d) single and triple
bonds
Correct answer –(a)
43.In reaction
of ethanol with potassium permanganate, potassium permanganate acts as
(a) reducing agent
(b) oxidising agent
(c) catalyst
(d) dehydrating agent
Correct answer –(b)
44. Vegetable oils are converted to vegetable ghee by
process of hydrogenation. It is a/an
(a) addition reaction
(b) substitution
reaction
(c) oxidation reaction
(d) decomposition
reaction
Correct answer –(a)
Explanation- In this reaction,
hydrogen is added to vegetable oils.
45. The name of
compound CH3−CH2−CHO is
(a) propanol
(b) propanal
(c) propanone
(d) ethanoic acid
Correct answer –(b)
46. Saponification
reaction is
H2SO4
(a)R−COOH+C2H5OH→R−COOC2H5+H2O
(b)2R−COOH + 2Na → 2R –COONa + H2
(c) R−COO C2H5 + NaOH → R−COONa + C2H5OH
Cao
(d)
R−COONa + NaOH → R−H + Na2CO2
Correct answer –(c)
47. The soap
molecule has a
(a) hydrophobic
head and a hydrophilic tail
(b) hydrophobic
head and a hydrophobic tail
(c) hydrophilic
head and a hydrophilic tail
hydrophilic head and a hydrophilic tail
Correct answer –(c)
48. Carbon
exists in the atmosphere in the form of
(a)
carbon
monoxide
(b)
carbon
monoxide in traces and carbo doxide
(c)
coal
(d)
carbon
doxide only
Correct answer –(d)
49. Which of the following statements are correct for
carbon compounds?
(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)
Correct answer –(d)
50. A molecule
of ammonia has
(a)only single bond
(b)only double bonds
( c) only triple bonds
(d)two double bonds and one single bond
Correct answer –(a)
51. Oils on treating with hydrogen in the presence of
palladium of nickel catalyst form fats , this is the
example of
(a)
Addition
reaction
(b)
Oxidation
reaction
(c)
Displacement
reaction
(d) Substitution reaction
Correct answer –(a)
52.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)
Correct answer –(d)
53. Chlorine reacts with saturated hydrocarbons at
room temperature in the
(a)
Absence of
sunlight
(b)
Presence of
water
(c)
Presence of
sunlight
(d) Presence of hydrochloric acid
Correct answer –(c)
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