MCQ Questions For Class 10 Science Carbon and Its Compounds With Answers
MCQ Questions For Class 10 Science Carbon and Its Compounds With Answers
MCQ Questions For Class 10 Science Carbon and Its Compounds With Answers
Answer
Answer: b
Answer
Answer: c
3.
Answer
Answer: b
Answer
Answer: d
Answer
Answer: b
6. Which of the following will undergo addition reactions?
(a) CH4
(b) C3H8
(C) C2H6
(d) C2H4
Answer
Answer: d
9. Which of the following will give a pleasant smell of ester when heated
with ethanol and a small quantity of sulphuric acid?
(a) CH3COOH
(b) CH3CH2OH
(c) CH3OH
(d) CH3CHO
Answer
Answer: a
Answer
Answer: d
(a) C4H10
(b) C4H8
(C) C4H6
(d) C4H4
Answer
Answer: b
Answer
Answer: a
Answer
Answer: b
19. In diamond, each carbon atom is bonded to four other carbon atoms to
form
(a) a hexagonal array
(b) a rigid three-dimensional structure
(c) a structure in the shape of a football
(d) a structure of a ring
Answer
Answer: b
Answer
Answer: d
Answer
Answer: d
Answer
Answer: b
Answer
Answer: d
Answer
Answer: d
25. Drinking alcohol is very harmful and it ruins the health. “Drinking
alcohol” stands for
(a) drinking methyl alcohol
(b) drinking ethyl alcohol
(c) drinking propyl alcohol
(d) drinking isopropyl alcohol
Answer
Answer: b
26. The ionic part of synthetic detergent is
Answer
Answer: a
27. The difference in the formula and molecular masses of CH3OH and
C2H5OH is
(a) CH3 and 16u
(b) CH2 and 14u
(c) CH4 and 18u
(d) CH3 and 16u
Answer
Answer: b
28. Which of the following statements about graphite and diamond is true?
(a) They have the same crystal structure
(b) They have the same degree of hardness
(c) They have the same electrical conductivity
(d) They can undergo the same chemical reactions
Answer
Answer: d
Answer
Answer: a
Answer
Answer: b
36. Which of the following statements are usually correct for carbon
compounds? These [NCERT Exemplar Problems]
(i) are good conductors of electricity
(ii) are poor conductors of electricity
(iii) have strong forces of attraction between their molecules
(iv) do nothave strong forces of attraction between their molecules
(a) (i) and (iii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (ii) and (iv)
Answer
Answer: d
Answer
Answer: c
40.
Answer
Answer: a
Answer
Answer: d
Answer
Answer: b
45. Pentane has the molecular formula C5H12. It has [NCERT Exemplar
Problems]
(a) 5 covalent bonds
(b) 12 covalent bonds
(c) 16 covalent bonds
(d) 17 covalent bonds
Answer
Answer: c
46. Ethanol reacts with sodium and forms two products. These are [NCERT
Exemplar Problems]
(a) sodium ethanoate and hydrogen
(b) sodium ethanoate and oxygen
(c) sodium ethoxide and hydrogen
(d) sodium ethoxide and oxygen
Answer
Answer: c
48. Carbon forms four covalent bonds by sharing its four valence electrons
with four univalent atoms, e.g. hydrogen. After the formation of four bonds,
carbon attains the electronic configuration of [NCERT Exemplar Problems]
(a) helium
(b) neon
(c) argon
(d) krypton
Answer
Answer: b
Answer
Answer: c
Answer
Answer: c
51. Which of the following does not belong to the same homologous series?
[NCERT Exemplar Problems]
(a) CH4
(b) C2H6
(c) C3H8
(d) C4H8
Answer
Answer: d
Answer/Explanation
Answer: a
Explanation:
Answer/Explanation
Answer: b
Explanation:
(b) Assertion is true but the Reason is false.
60. Assertion: Ethanoic acid reacts with ethyl alcohol in presence of cone
H2SO4 to form ethyl ethanoate.
Reason: Esters are used in ice creames and cold drinks.
Answer/Explanation
Answer: b
Explanation:
(b) The Assertion and the Reason are correct but the Reason is not the
correct explanation of the Assertion.
Answer/Explanation
Answer: c
Explanation:
(c) Assertion is true but the Reason is false.
62. Assertion: Soaps are 100% biodegradable but do not work well with
hard water.
Reason: Some detergents are not bio-degradable but work well with hard
water.
Answer/Explanation
Answer: b
Explanation:
(b) The Assertion and the Reason are correct but the Reason is not the
correct explanation of the Assertion.
63. 100% pure ethyl alcohol is called _____________ .
Answer/Explanation
Answer:
Explanation: absolute alcohol
Answer/Explanation
Answer:
Explanation: Formic acid
Answer/Explanation
Answer:
Explanation: chloromethane, substitution
Answer:
Explanation: False
Answer/Explanation
Answer:
Explanation: False
71. When the oxygen supply is insufficient, then fuel bum incompletely
producing mainly a blue flame. [True/False]
Answer/Explanation
Answer:
Explanation: False
Answer/Explanation
Answer:
Explanation:
(i) (C)
(ii) (A)
(iii) (B)
(iv) (D)
Answer/Explanation
Answer:
Explanation: 0.02%, 0.03%
Answer
Answer:
It is due to small size.
77. What will be the product formed when carbon is burnt in presence of
air?
Answer/Explanation
Answer:
Carbon dioxide
Answer/Explanation
Answer:
Explanation:
It is a property due to which an element can exist in more than one form
which differ in physical properties but have similar chemical properties, e.g.,
carbon, sulphur, phosphorus, oxygen show allotropy.
Answer/Explanation
Answer:
Explanation:
Diamond, graphite and Buckminster fullerenes
Answer/Explanation
Answer:
Explanation: Buckminster fullerenes.
Answer/Explanation
Answer:
Explanation:
Due to weak van der Waals’ forces of attraction between hexagonal layers.
Answer/Explanation
Answer:
Explanation:
It is due to strong covalent bonds.
Answer/Explanation
Answer:
Explanation:
It is due to high refractive index.
84. Carbon has four electrons in its valence shell. How does carbon attain
stable electronic configuration. [CBSE 2015]
Answer/Explanation
Answer:
Explanation:
By sharing four electrons with other atoms.
Answer/Explanation
Answer:
Explanation:
It is because carbon can share form electrons to complete its octet.
Answer/Explanation
Answer:
Explanation:
Carbon shows catenation to maximum extent because it forms strong
covalent bonds.
Answer/Explanation
Answer:
Explanation: Methane
Answer/Explanation
Answer:
Explanation: Cyclohexane
89. What are organic Compounds?
Answer/Explanation
Answer:
Explanation:
Those compounds which consist of carbon essentially and hydrogen mostly
along with other elements like oxygen, sulphur, nitrogen, halogens, etc., are
called organic compounds.
Answer/Explanation
Answer:
Explanation:
It was proposed that ‘vital force’ is necessary for formation of these organic
compounds. They can only be obtained from living organisms.
Answer/Explanation
Answer:
Explanation:
In 1828, Wohlar prepared first organic compound urea by heating
ammonium cyanate by isomerisation reaction.
93. Write the electron dot structure of ethene molecule (C2H42). [Delhi 2011]
Answer/Explanation
Answer:
Explanation:
Answer/Explanation
Answer:
Explanation:
(a) Ethanol
(b) Ethanal
95. Write the general formula of hydrocarbon alkene. Write the name of
simplest alkene. [CBSE 2015]
Answer/Explanation
Answer:
Explanation: CnH2n, Ethene
96. Write the electron dot structure of ethane molecule (C2H6). [Delhi 2011]
Answer/Explanation
Answer:
Explanation
97. Write the number of covalent bonds in the molecule of ethane. [AI 2015]
Answer/Explanation
Answer:
98. Write the number of covalent bonds in the molecule of propane, C3H8.
[DoE,AI2015]
Answer
Answer:
99. Write the number of covalent bonds in the molecule of butane, C4H10. [AI
2015]
Answer
Answer:
Answer
Answer:
101. Write the molecular formula of benzene and state the number of
double bonds in its structure. [CBSE 2013]
Answer
Answer:
102. Write the molecular formula of the 2nd and the 3rd member of the
homologous series whose first member is methane. [AI 2017]
Answer/Explanation
Answer:
Explanation:
C2H6 and C3H8 are molecular formula of 2nd and 3rd member of alkanes.
103. Write the general formula of hydrocarbon alkene. Write the name of
simplest alkene. [CBSE 2015]
Answer/Explanation
Answer:
Explanation:
CnH2n, Ethene
It has three double bonds.
104. Write the molecular formula of first two members of homologous series
with functional group —OH. [CBSE 2017]
Answer/Explanation
Answer:
Explanation:
Methanol (CH3OH) and Ethanol (CH3CH2OH).
ANSWERS
1. Carbon
2. sharing
3. alkenes
4. CnH2n-2
5. homologous series
6. Esters