CBSE Board Exam is on the way, so you must practice some good Case Study Questions Class 10 Science to boost your preparation to score 95+% on Boards. In this post, you will get Case Study and Passage Based Questions that will come in CBSE Class 10 Science Board Exams.
In CBSE Class 10 Science Paper, Students will have to answer some questions based on Assertion and Reason. There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.
Carbon and its Compounds Case Study Questions With Answers
Here, we have provided case-based/passage-based questions for Class 10 Science Chapter 4 Carbon and Its Compounds.
Case Study/Passage Based Questions
Read the following and answer any four questions from (i) to (v).
The compounds which have the same molecular formula but differ from each other in physical or chemical properties are called isomers and the phenomenon is called isomerism. When the isomerism is due to differences in the arrangement of atoms within the molecule, without any reference to space, the phenomenon is called structural isomerism. In other words. structural isomers are compounds that have the same molecular formula but different structural formulas, i.e., they are different in the order in which different atoms are linked. In these compounds, carbon atoms can be linked together in the form of straight chains, branched chains or even rings.
(i) Which of the following sets of compounds have the same molecular formula?
(a) Butane and iso-butane
(b) Cyclohexane and hexene
(C) Propanal and propanone
(d) All of these
Answer: (d) All of these
(ii) In order to form branching, an organic compound must have a minimum of
(a) four carbon atoms
(b) three carbon atoms
(c) five carbon atoms
(d) any number of carbon atoms.
Answer: (a) four carbon atoms
(iii) Which of the following is an isomeric pair?
(a) Ethane and propane
(b) Ethane and ethene
(c) Propane and butane
(d) Butane and 2-methylpropane
Answer: (d) Butane and 2-methylpropane
(iv) Among the following the one having longest chain is
Answer: (C) 2-methylpentane
(v) The number of isomers of pentane is
Answer: (b) 3
Food, clothes, medicines, books, or any of the things are all based on this versatile element carbon. In addition, all living structures are carbon-based. The earth’s crust has only 0.02% carbon in the form of minerals. The element carbon occurs in different forms in nature with widely varying physical properties. Both diamond and graphite are formed by carbon atoms, the difference lies in the manner in which the carbon atoms are bonded to one another. Carbon has the unique ability to form bonds with other atoms of carbon, giving rise to large molecules. This property is called catenation.
(i) From the given alternatives, whose chemical and physical properties are not the same?
(a) Graphite and Diamond
(b) Phosphorous and Sulphur
(c) Carbon and Hydrogen
(d) Methyl alcohol and Acetic acid
Answer: (d) Due to presence of different functional groups methyl alcohol and acetic acid. Possess different physical and chemical properties.
(ii) Which of the following statements is not correct?
(a) Graphite is much less dense than diamond
(b) Graphite is black and soft
(c) Graphite has low melting point
(d) Graphite feels smooth and slippery
Answer: (c) Graphite has low melting point
(iii) Which of the following are isomers?
(a) Butane and isobutene
(b) Ethane and ethene
(c) Propane and propyne
(d) Butane and isobutane
Answer: (d) Butane and isobutane have same chemical formula but different arrangement of atoms and have different structure.
(iv) Which one of the following is not an allotrope of carbon?
Answer: (d) Carborundum is SiC (silicon carbide).
(v) Pentane has the molecular formula C5H12. It has
(a) 5 covalent bonds
(b) 12 covalent bonds
(c) 16 covalent bonds
(d) 17 covalent bonds
Answer: (c) 16 covalent bonds
A homologous series is a series of organic compounds which belong to the same family (i.e. possess same functional group) and show similar chemical properties. The members of this series are called homologous and differ from each other by the number of CH2 units in the main carbon chain.
3.1) Which of the following is not the property of a homologous series ?
(a) They all contain double bond.
(b) They differ by 14 units by mass.
(c) They show similar chemical properties.
(d) They can be represented by a general formula.
Answer: (a) They all contain double bond
3.2) Which of the following represent the name and formula of the 2nd member of homologous series having general formula CnH2n + 2 ?
(a) Methane CH4
(b) Ethane C2H6
(c) Ethyne C2H6
(d) Ethene C2H4
Answer: (b) Ethane C2H6
3.3) The chemical properties of which of the following compounds is similar to the butane ?
Answer: (b) Pentane
3.4) The difference between two consecutive members in a homologous series in alkanes in terms of molecular mass and number of atoms of elements is :
(a) 14 a.m.u and CH respectively
(b) 12 a.m.u and CH respectively
(c) 14 a.m.u and CH2 respectively
(d) 12 a.m.u and CH3 respectively
Answer: (c) 14 a.m.u and CH2 respectively
3.5) Which of the following does not belong to the same homologous series ?
Answer: (d) C4H8
Some elements exist in various forms. These forms have different physical properties but have the same chemical properties. They are called allotropes of the element. Carbon, Phosphorous and sulphur have allotropes. Diamond and graphite are the allotropes of carbon. The differences in the physical properties of diamond and graphite are because of the manner in which the carbon atoms are arranged.
4.1) The hardest substance known which doesn’t conduct electricity is :
4.2) Diamond is a :
(a) three dimensional structure
(b) one dimensional structure
(c) two dimensional structure
(d) none of these
Answer:(a) three dimensional structure
4.3) Graphite is used as a crucible to melt metals because :
(a) it has low melting point
(b) it has high boiling point
(c) it has low boiling point
(d) it has high melting point
Answer:(d) it has high melting point
4.4) Which of the following is correct the structure of diamond ?
(a) Carbon atoms are held together by single covalent bonds.
(b) Carbon atoms conduct electricity in the molten state.
(c) Layers of atoms slide easily over each other.
(d) Electrons move freely through the structure.
Answer:(a) Carbon atoms are held together by single covalent bonds.
4.5) Diamond is not a good conductor of electricity because :
(a) it is very hard.
(b) it has no free electrons.
(c) it is not water soluble.
(d) its structure is very compact.
Answer:(b) it has no free electrons..
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