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UP Board Class 10 Chemistry — practice by topic

Browse 35 questions across 2 Chemistry topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Chemistry topics

Chemical Reactions and Equations (30)Elements, Compounds and Mixtures (5)

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How many valence electrons does a carbon atom have?Read the answer and worked solution →Reaction of CH₄ with Cl₂ in sunlight to give CH₃Cl is an example of:Read the answer and worked solution →A series of compounds in which successive members differ by a –CH₂– unit is called a:Read the answer and worked solution →Pentane and isopentane share the formula C₅H₁₂ but differ in their carbon arrangement. They are:Read the answer and worked solution →

Worked practice questions

How many valence electrons does a carbon atom have?

  1. Four
  2. Two
  3. Six
  4. Eight
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Correct answer: A. Four

1. Carbon has atomic number 6 with electronic configuration 2, 4. 2. The outermost shell holds four electrons. 3. These four valence electrons let carbon form four covalent bonds. 4. So the answer is four. _Source: syllabus Science Ch 4 'Carbon and its Compounds' (byjus.com extract)_

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Reaction of CH₄ with Cl₂ in sunlight to give CH₃Cl is an example of:

  1. a substitution reaction
  2. an addition reaction
  3. a combination reaction
  4. an oxidation reaction
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Correct answer: A. a substitution reaction

A hydrogen atom in saturated methane is replaced by a chlorine atom. That is a substitution reaction — the typical mode for saturated compounds.

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A series of compounds in which successive members differ by a –CH₂– unit is called a:

  1. periodic series
  2. reactivity series
  3. homologous series
  4. isomeric series
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Correct answer: C. homologous series

A homologous series has members differing by –CH₂– with similar chemical properties.

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