CBSE Class 10 Science Carbon and its Compounds MCQs Set 04

Question. Carboxylic acid containing one carbon atom is
(a) Formic acid
(b) Acetic acid
(c) Citric acid
(d) Vinegar

Answer : A

Question. The odour of acetic acid resembles that of:
(a) Tomato
(b) Kerosene
(c) Vinegar
(d) Lemon juice

Answer : C

Question. Sodium carbonate solution is added to dilute ethanoic acid) It is observed that :
(a) A gas evolves
(b) A solid settles at the bottom
(c) The mixture becomes warm
(d) The colour of the mixture

Answer : A

Question. 2ml of acetic acid is added to 5ml of water and was shaken up for 1minute, it was noticed that:
(a) The acid formed a separate layer on the top of water
(b) Water formed a separate layer on the top of the acid
(c) A clear and homogeneous solution is formed
(d) A pink and clear solution is formed

Answer : C

Question. On adding NaHCO₃ to acetic acid, a gas is evolved which turns lime water milky due to the formation of:
(a) Calcium Carbonate
(b) Calcium Hydroxide
(c) Calcium bicarbonate
(d) Calcium Acetate

Answer : A

Question. Which among the following contains triple bond:
(a) C₂H₄
(b) C₂H₂
(c) C₃H₄
(d) C₂H₆

Answer : B

Question. The number of covalent bonds in C₅H₁₂ is:
(a) 15
(b) 16
(c) 17
(d) 18

Answer : B

Question. Which amongst the following does not conduct electricity:
(a) CH₃COOH
(b) C₃H₇OH
(c) HCOOH
(d) NaCl(aq)

Answer : B

Question. Methane reacts with one mole of Chlorine in presence of sunlight to give _________.
The reaction is called_______.
(a) Chloromethane, substitution
(b) Dichloromethane, addition
(c) Trichloromethane, elimination
(d) Tetra chloro methane, combustion

Answer : A

Question. Catenation is maximum in:
(a) Carbon
(b) Oxygen
(c) Sulphur
(d) Phosphorous

Answer : A

Question. Ethane and ethene can be distinguished by using:
(a) Bromine water
(b) Chlorine water
(c) I₂
(d) HCl

Answer : A

Question. The number of isomers of C₆H₁₄ are
(a) 4
(b) 5
(c) 6
(d) 7

Answer : C

Question. Which of the following represents cyclohexane:
(a) C₆H₁₄
(b) C₆H₁₂
(c) C₆H₁₀
(d) C₆H₆

Answer : B

Question. The IUPAC name of the following;

(a) Butanal
(b) Butanoic acid
(c) Butanol
(d) Pentane

Answer : B

Question. Which of the following are members of the same homologous series:
(a) CH₄ and C₂H₄
(b) CH₃OH and CH₃Cl
(c) C₂H₅OH and C₃H₇OH
(d) CH₃OCH₃ and C₂H₅OH

Answer : B

Question. The difference in the molecular formula and molecular mass of CH₄ and C₂H₆ is:
(a) CH₃ and 12u
(b) CH₂ and 12u
(c) CH₃ and 14u
(d) CH₂ and 14u

Answer : D

Question. Which of the following statements about diamond and graphite is true?
(a) They have same crystal structure
(b) They have same degree of hardness
(c) They have same electrical conductivity
(d) They have same chemical properties.

Answer : D

Question. Identify the correct statements. 
(i) As the molecular mass increases in any homologous series, a gradation in physical properties is seen.
(ii) The melting and boiling points decrease with increasing molecular mass.
(iii) Other physical properties such as solubility in a particular solvent decreases with increasing molecular mass.
(iv) The chemical properties, which are determined solely by the functional group, remain similar in a homologous series.
(a) (ii) and (iii)
(b) (ii) and (iv)
(c) (i), (iii) and
(iv) (d) All are correct.

Answer : C

Question. The structural formulae of compounds Q and R are shown below : 


Which statement about compounds Q and R is correct?
(a) They belong to the same homologous series.
(b) They have the same percentage composition by mass.
(c) They have the same boiling point.
(d) They have different general formulae.

Answer : B

Question. Graphite is a good conductor of electricity. Diamond is a poor conductor of electricity. Substance X is a moderate conductor of electricity. Substance X has the structure shown below: 

Which statement about substance X is correct?
(i) It is a covalent compound.
(ii) It has a giant molecular structure.
(iii) It has the same structure as graphite.
(iv) It has the same structure as diamond.
(a) (i) and (iii)
(b) (ii) and (iii)
(c) (ii) and (iv)
(d) (i), (ii) and (iv)

Answer : C

Question. __________ is widely used as a fuel and is a major component of bio-gas and CNG. It is also one of the simplest compounds formed by carbon. 
(a) Ethane
(b) Propane
(c) Carbon dioxide
(d) Methane

Answer : D

Question. Which of the following compounds has a triple bond? 
(a) C₂H₄
(b) C₃H₄
(c) C₃H₈
(d) C₄H₁₀

Answer : B

Question. Which of the following statements is not correct? 
(a) A common functional group is present in different members of a homologous series.
(b) Two consecutive members of a homologous series differ by a –CH₃ group.
(c) The members of a homologous series can be represented by one general formula.
(d) Different members of a homologous series have similar chemical properties.

Answer : B

Question. The general formula of cycloalkanes is 
(a) C_nH_{2n + 2}
(b) C_nH_{2n – 2}
(c) C_nH_{2n – 1}
(d) C_nH_2n

Answer : D

Question. How many structural isomers are possible for pentane (C₅H₁₂)?
(a) 1
(b) 4
(c) 2
(d) 3

Answer : D

Question. Which of the following is not a characteristic of members of a homologous series? 
(a) They possess varying chemical properties.
(b) Their physical properties vary in regular and predictable manner.
(c) Their formulae fit the general molecular formula.
(d) Adjacent members differ by one carbon and two hydrogen atoms.

Answer : A

Question. Which of the following exists as a simple triatomic molecule? 
(a) Argon
(b) Fluorine
(c) Nitrogen
(d) Ozone

Answer : D

Question. Number of electrons shared between carboncarbon atoms in ethene is 

(a) 2
(b) 4
(c) 6
(d) 8

Answer : B

Question. Chlorine forms a diatomic molecule, Cl₂. The electron dot structure for this molecule is 

Answer : C

Question. Which of the following has shortest carboncarbon bond length? 
(a) C₂H₂
(b) C₂H₄
(c) C₂H₆
(d) C₆H₆

Answer : A

Question. Which of the following statements is correct? 
(a) Most organic compounds are ionic compounds.
(b) Ethane and ethene belong to the same homologous series.
(c) Propene contains three hydrogen atoms per molecule.
(d) Chloroethane contains two carbon atoms per molecule.

Answer : D

Question. In C₆H₁₄ the number of possible isomers is 
(a) 3
(b) 6
(c) 4
(d) 5

Answer : D

Question. The organic compound, R, has the structure shown below: 

Which structure is not an isomer of R?

Answer : D

Question. Which type of bond is present between carbon-carbon atoms in acetylene? 
(a) Single covalent bond
(b) Double covalent bond
(c) Triple covalent bond
(d) Electrovalent bond

Answer : C

Question. Which of the following organic compounds does not have the same chemical properties as methanol? 
(a) C₂H⁶O
(b) C₅H₁₀O
(c) C₄H₁₀O
(d) C₇H₁₆O

Answer : B

Question. Which of the following represent saturated hydrocarbons? 
1. CH(CH₃)₃
2. CH₂CHCH₃
3. CH₃CH(CH₃)CH₂CH₃
4. (CH₃)₂CCHCH₃
(a) 1 and 3
(b) 2 and 4
(c) 1, 2 and 3
(d) 1, 2, 3 and 4

Answer : A

Question. Which of the following molecules has all its atoms joined together by double covalent bonds? 
(a) Methane
(b) Water
(c) Carbon dioxide
(d) Nitrogen trichloride

Answer : C

Question. Which of the following hydrocarbons represents the isomer of butene? 

Answer : B

Question. The table shows the formulae of three organic compounds that belong to the same homologous series. 

What is the general formula of this series?
(a) C_nH_2nO
(b) C_nH_2n+2O
(c) C_nH_2nOH
(d) C_nH_2n+2OH

Answer : B