CBSE Class 10 Science Carbon and its Compounds MCQs Set 07

Question. A hydrocarbon has four carbon atoms. Give its molecular formula if it is an alkene.
(a) C₄H₁₀
(b) C₄H₈
(c) C₄H₆
(d) C4H₄

Answer: B

Question. Soaps are formed by saponification of     
(a) Alcohols
(b) Glycosides
(c) Simple esters
(d) Carboxylic acids

Answer: C

Question. Sodium reacts with ethanol gives …………   
(a) Sodium ethoxide
(b) Sodium ethanoate
(c) Sodium ethanol
(d) Sodium hydroxide

Answer: A

Question. ………….has sweet flavoring substance which used in ………….   
(a) Ester, metals
(b) Ethers, sweet mithai
(c) Aldehyde, metals
(d) Ester, perfumes

Answer: D

Question. A reagent which can help us to distinguish between alkenes and alkynes is:   
(a) Bromine water
(b) Carbon tetrachloride
(c) Alkaline KMnO₄
(d) Ammoniacal cuprous chloride

Answer: D

Question. The number of structural isomers of the compound having molecular formula C₄H₉Br is
(a) 3
(b) 5
(c) 4
(d) 2

Answer: C

Question. For gas welding used for welding broken pieces of iron, we normally use a mixture of   
(a) Ethane and oxygen
(b) Ethene and oxygen
(c) Ethyne and oxygen
(d) Ethene and air

Answer: A

Question. Major constituent of LPG is……………   
(a) Ethene
(b) Butane
(c) Propane
(d) Pentane

Answer: B

Question. Which of the given is a noble gas?     
(a) Carbon
(b) Argon
(c) Nitrogen
(d) Hydrogen

Answer: B

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. Give the IUPAC name of CH₃COOC₂H₅.
(a) Ethyl ethanoic acid
(b) Butanoate
(c) Ethyl ethanoate
(d) Etyl methyl carboxylic acid

Answer: C

Question. A carbon compound contains two atoms of carbon. Which name should the carbon compound bear?
(a) Butane
(b) Ethane
(c) Methane
(d) Propan

Answer: B

Question. C₂H₂ Called………..   
(a) Ethyne
(b) Butane
(c) Ethane
(d) Propene

Answer: A

Question. Read The Following Sentences Carefully, And Choose The Incorrect One:   
(a) Normal-butane has a straight chain structure whereas iso-butane has a branched chain structure.
(b) All the members of a homologous series can be represented by the different formula.
(c) Isomerism is possible only with hydrocarbons having 4 or more carbon atoms.
(d) The organic compounds having the same molecular formula but different structures are known as isomers.

Answer: B

Question. Ethane with the molecular formula C₂H₆ has :
(a) 6 covalent bonds
(b) 7 covalent bonds
(c) 8 covalent bonds
(d) 9 covalent bonds

Answer: B

Question. During decarboxylation of ethanoic acid with sodalime (NaOH + CaO), CO₂ is removed as –
(a) CO₂
(b) CO
(c) Na₂CO₃
(d) CaCO₃

Answer: C

Question. A sweet smelling compound formed by reacting acetic acid with ethanol in the presence of hydrochloric acid is A
(a) CH₃COOC₂H₅
(b) C₂H₅COOH
(c) C₂H₅COOCH₃
(d) CH₃OH

Answer: A

Question. Identify the correct order of boiling points of the following compounds-
(A) CH₃CH₂CH₂CH₂OH
(B) CH₃CH₂CH₂CHO
(C) CH₃CH₂CH₂COOH
(a) (A) > (B) > (C)
(b) (C) > (A) > (B)
(c) (A) > (C) > (B)
(d) (C) > (B) > (A)

Answer: B

Question. The general formula for alkanes is C_nH_2n+1–CHO. The value of ‘n’ for the first member.   
(a) 1
(b) 0
(c) 0.5
(d) 1.1

Answer: B

Question. Functional group – COOH is present in which of the following?
(a) Carboxylic acid
(b) Alcohol
(c) Aldehyde
(d) Ketone

Answer: A

Question. IUPAC name of the first member of the homologous series of ketones is
(a) Ethanone
(b) Methanone
(c) Propanone
(d) Butanone

Answer: C

Question. The organic compounds having ketonic group is :
(a) CH₃COOH
(b) CH₃COCH₃
(c) HCOOH
(d) CH₃CH₂OH

Answer: D

Question. Which allotrope of carbon is in the form of the geodesic globe?
(a) Graphite
(b) Diamond
(c) Fullerene
(d) Carbon nanotube

Answer: C

Question. 2 electron in outer shell. Name the noble gas of element.
(a) Hydrogen
(b) Helium
(c) Carbon
(d) Argon

Answer: B

Question. How many carbon atoms are present in one molecule of ethanoic acid?
(a) One
(b) Two
(c) Three
(d) Four

Answer: B

Question. Oxidation of alcohol get converts into…………
(a) CO₂
(b) CO
(c) Carboxylic acid
(d) Halogen

Answer: C

Question. Which of the following property is not shown by covalent compounds?
(a) Exist as crystalline solids
(b) Poor conductors of electricity
(c) Low boiling and melting points
(d) Insoluble in water

Answer: A

Question. Ammonia shows the following formula.
(a) NH₃
(b) NH₄
(c) CH₄
(d) CH₂

Answer: A

Question. Identify the uses of ethanol.
(a) It is used as an organic solvent.
(b) It is used as a fuel in cars along with petrol.
(c) It is used in alcoholic drinks.
(d) All of the above

Answer: D

Question. Functional group – CHO is present in which of the given?
(a) Carboxylic acid
(b) Alcohol
(c) Aldehyde
(d) Ketone

Answer: C