CBSE Class 10 Science MCQs Chapter 4: Carbon and Its Compounds

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Questions and Answers

What is the electronic configuration of an element that allows one carbon atom to form 4 bonds in a compound?

  • 2, 4
  • 2, 8 (correct)
  • 2, 6
  • 4, 4

In the addition of chlorine to methane in the presence of sunlight, what is the likely product when X is represented as CH3Cl?

  • CH3Cl2
  • CH4Cl
  • CH2Cl2
  • CH2Cl (correct)

Which type of bonds are normally formed by carbon in most of its compounds?

  • Single bonds only
  • A combination of single, double, and triple bonds (correct)
  • Double bonds only
  • Triple bonds only

What is the process by which methane reacts with chlorine to form chloromethane?

<p>Addition (C)</p> Signup and view all the answers

What is the hybridization state of carbon in a compound where it forms 3 sigma bonds and no lone pairs?

<p>sp (C)</p> Signup and view all the answers

What is the correct classification of the compound CH3Cl + HCl?

<p>Alkanes (D)</p> Signup and view all the answers

In the reaction involving ethanol, potassium dichromate, and sulfuric acid, what role does potassium dichromate play?

<p>Oxidizing agent (B)</p> Signup and view all the answers

Which characteristic of a carbon compound determines whether it will be named as an alkane, alkene, or alkyne?

<p>Type and number of bonds between carbon atoms (B)</p> Signup and view all the answers

Why does a soap molecule have one end that is ionic?

<p>To facilitate bonding with oils and dirt (B)</p> Signup and view all the answers

When adding chlorine gas to a hydrocarbon in sunlight, why does chlorine substitute hydrogen atoms?

<p>To increase reactivity (C)</p> Signup and view all the answers

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Study Notes

Bonding in Carbon Compounds

  • The electronic configuration of carbon that allows it to form 4 bonds in a compound is 1s² 2s² 2p².
  • Carbon typically forms covalent bonds in its compounds.

Addition Reaction

  • When chlorine is added to methane (CH₄) in the presence of sunlight, the likely product is chloromethane (CH₃Cl).

Hybridization in Carbon

  • When carbon forms 3 sigma bonds and no lone pairs, its hybridization state is sp³.

Classification of Compounds

  • CH₃Cl + HCl is classified as an organic compound.

Oxidation Reaction

  • In the reaction involving ethanol, potassium dichromate, and sulfuric acid, potassium dichromate acts as an oxidizing agent.

Nomenclature of Carbon Compounds

  • The characteristic that determines whether a carbon compound is named as an alkane, alkene, or alkyne is the presence of single, double, or triple bonds between carbon atoms.

Soap Molecules

  • A soap molecule has one end that is ionic due to the presence of a negatively charged carboxyl group (-COO⁻) and a positively charged sodium ion (Na⁺).

Substitution Reaction

  • When chlorine gas is added to a hydrocarbon in sunlight, chlorine substitutes hydrogen atoms due to the formation of a more stable chlorine-carbon bond.

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