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MCQ Questions for Class 10 Science Chapter 4 Carbon and Its Compounds with Answers

 

Carbon and Its Compounds Class 10 MCQs Questions with Answers

Question 1.
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) 7 covalent bonds

Question 2.
Butanone is a four-carbon compound with the functional group:
(a) carboxylic acid
(b) aldehyde
(c) ketone
(d) alcohol
Answer:
(c) ketone

Question 3.
While cooking, if the bottom of the vessel is getting blackened 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
(d) the fuel is burning completely.
Answer:
(b) the fuel is not burning completely

Question 4.
The chemical formulae of propane is :
(a) CH4
(b) C3H8
(c) C4H10
(d) C2H6
Answer:
(b) C3H8

Question 5.
The functional group present in propanal is :
(a) OH
(b) –CHO
(c) –COOH
(d) –C = O
Answer:
(b) –CHO

Question 6.
When ethanol is heated with con, sulphuric acid at 170°C, it gets converted into ethene. In this reaction concentrated sulphuric acid acts as :
(a) catalyst
(b) oxidising agent
(c) dehydratory agent
(d) reducing agent.
Answer:
(a) catalyst

Question 7.
Vinegar is a solution of about:
(a) 5 – 8% of ethanoic acid in alcohol
(b) 5 – 8% of ethanoic acid in water
(c) 50 – 80% of ethanoic acid in water
(d) 50 – 80% of ethanoic acid in alcohol.
Answer:
(b) 5 – 8% of ethanoic acid in water

Question 8.
The number of carbon atom present in the molecule of fifth member of the homologous series of alkynes is :
(a) four
(b) five
(c) six
(d) seven
Answer:
(c) six

Question 9.
Which of the following is homologous pair?
(a) CH4 and C2H4
(b) CH3OH and CH3CHO
(c) HCHO and CH3CHO
(d) C3H5OH and CH3COCH3.
Answer:
(c) HCHO and CH3CHO

Question 10.
I.U.P.A.C. name of acetaldehyde is:
(a) Ethanol
(b) Ethanal
(c) Methanol
(d) Methanal
Answer:
(b) Ethanal

Question 11.
The important feature of homologous series is :
(a) Difference in the chemical properties of compounds.
(b) Difference in the general formula of compounds
(c) Specific methods of formation of compounds
(d) Similarly in the functional group of compounds.
Answer:
(d) Similarly in the functional group of compounds.

Question 12.
IUPAC name of ethyl alcohol is :
(a) Ethanol
(b) Methanol
(c) Acetic Acid
(d) Ethanoic Acid.
Answer:
(a) Ethanol

Question 13.
Reason of high number of organic compounds is :
(a) High activeness of carbon
(b) Changeable valency of carbon
(c) Ability ty of carbon to make covalent compound
(d) Abilito make series by connecting atoms together.
Answer:
(d) Abilito make series by connecting atoms together.

Question 14.
IUPAC name of formaldehyde:
(a) Formaldehyde
(b) Methanol
(c) Ethanol
(d) Aceteldehyde.
Answer:
(b) Methanol

Question 15.
The IUPAC name of  is :
(a) butanone
(b) propanone
(c) butanol
(d) propanol
Answer:
(b) propanone

Question 16.
The organic compounds having ketonic group is :
(a) CH3COOH
(b) CH3COCH3
(c) HCOOH
(d) CH3CH2OH
Answer:
(b) CH3COCH3

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