Class 10 Last 10 year Important Questions #03 | Carbon and Its Compounds Class 10 CBSE BOARD

Class 10 Last 10 year Important Questions #013 | Carbon and Its Compounds Class 10 CBSE BOARD #2piclasses #class10science #importantquestions #extraquestions #oswaalbooks #boardexam #cbseclass10 #Class10Last10yearImportantQuestions #CarbonanditscompoundsClass10CBSEBOARD In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as : (A) Both A and R are true and R is the correct explanation of A. (B) Both A and R are true but R is NOT the correct explanation of A. (C) A is true but R is false (D) A is false and R is true Q4. Assertion (A) : Third member of alkane is propane (C₃H₈) Reason (R) : It is obtained from general formula CₙH₂ₙ+₂ Q5. Assertion (A) : Esterification is a process in which a sweet smelling substance is produced Reason (R) : When esters react with sodium hydroxide, an alcohol and sodium salt of carboxylic acid are obtained. Q6. Assertion (A) : Acetic acid has six single bond and one double bond. Reason (R) : It is saturated organic compound. I. Read the given passage and answer the questions that follow : Carbon has the unique property to form bonds with other atoms of carbon. | | | —C—C—C— | | | —C— | Q1. Name the characteristic property of carbon as depicted in the figure. (A) Catenation (B) Polymerization (C) Isomerisation (D) None of the above Q2. Carbon forms large number of compounds due to : (A) Catenation only (B) Tetravalency only (C) Both catenation and tetravalency (D) None of the above Q3. Carbon is : (A) Divalent (B) Monovalent (C) Tetravalent (D) Trivalent Q4. Which of these is a saturated compound in which 6 carbon atoms are arranged in a ring? (A) Hexane (B) Cyclohexane (C) Pentane (D) Cyclopentane II. Read the given passage and answer the questions that follow : Homologous series is a series of compounds with similar chemical properties and same functional group differing from the successive member by —CH₂ unit. Carbon chains of varying length have been general formula. Such organic compounds that vary from one another by a repeating unit and have the same general formula from a series if compounds. Alkanes with general formula CₙH₂ₙ+₂, alkenes with general formula CₙH₂ₙ and alkynes with general formula CₙH₂ₙ-₂ form the most basic homologous series in organic chemistry. All the members belonging to this series have the same functional groups. They have similar physical properties and follow a fixed gradation with increasing mass. This series has enabled scientists to study different organic compounds systematically. They can predict the properties of organic compounds belonging to a particular homologous series based on the data available from the other members of the same series. The study of organic compounds has been simplified. Q1. Which of these statements is correct about the members of a homologous series? (A) They have same melting points (B) They have same general formula (C) They have same molecular masses (D) They have same physical properties Q2. Two compounds CH₃OH and C₂H₅OH are provided. The difference in its formulae and molecular masses are _I_ and __II__. (A) I-CH₃, II-16 units (B) I-CH₂, II-14 units (C) I-CH₄, II-18 units (D) I-CH₃, II-16 units Q3. What is the molecular formula of the 5th member of the homologous series of carbon compounds, which is represented by the general formula CₙH₂ₙ+₁OH? Q4. The general formula of alkene is : (A) CₙH₂ₙ (B) CₙH₂ₙ+₂ (C) CₙH₂ₙ-₂ (D) CₙH₂ₙ+₁ Q3. Name the functional group present in the following compound : (i) CH₃COOH (ii) CH₃C(O)CH₃ II. Read the given passage and answer the questions that follow : The pictures show the bonds formed by the sharing of electrons by the atoms of four different molecules. Q1. Which molecule has the strongest bond between its atoms? (A) Hydrogen (B) Carbon (C) Nitrogen (D) Oxygen Q. 2. What is this type of bond between atoms known as? Q. 3. Which of these statements is true about carbon compounds? Circle ‘Yes’ or ‘No’ for the correct response. Is this true about carbon compounds? Yes or No They are good conductors of electricity? Yes/No They exist in either saturated or unsaturated form. Yes/No They have lower boiling points than ionic compounds. Yes/No Q. 4. Which element exhibits the property of catenation to maximum extent and why?