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Uttarakhand Board Class 10 Chemistry — practice by topic

Browse 203 questions across 30 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

Carbon and its Compounds (68)Periodic Classification of Elements (44)Metals and Non-metals (43)Alcohols Phenols Ethers (40)Aldehydes Ketones (40)Alkenes (40)Chemical Equilibrium (40)Classification of Elements and Periodicity (40)Classification of Elements and Periodicity in Properties (40)Organic Chemistry (40)p-Block Elements (40)p-Block Elements (Groups 15-18) (40)Periodic Classification (40)Periodic Table (40)Periodic Trends (40)Polymers (40)S Block Elements (40)States of Matter (40)The p-Block Elements (40)The Periodic Table (40)Acids, Bases and Salts (31)Acids Bases Salts (31)Atoms and Molecules (17)Chemical Reactions and Equations (17)Classification of Elements (12)Hydrogen (7)Metals & Non-metals (5)Amines (3)Surface Chemistry (3)Solid State (2)

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Which observation does NOT necessarily indicate a chemical reaction?Read the answer and worked solution →Balance: H₂ + O₂ → H₂O.Read the answer and worked solution →Which principle requires us to balance chemical equations?Read the answer and worked solution →Balance: Fe + H₂O → Fe₃O₄ + H₂.Read the answer and worked solution →

Worked practice questions

Which observation does NOT necessarily indicate a chemical reaction?

  1. A gas is evolved
  2. Colour changes
  3. A precipitate forms
  4. Volume decreases
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Correct answer: D. Volume decreases

Volume change can happen with purely physical processes (e.g., cooling). The other three are characteristic signs of a chemical change.

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Balance: H₂ + O₂ → H₂O.

  1. 2 H₂ + 2 O₂ → 2 H₂O
  2. H₂ + O₂ → H₂O
  3. 2 H₂ + O₂ → 2 H₂O
  4. H₂ + 2 O₂ → 2 H₂O
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Correct answer: C. 2 H₂ + O₂ → 2 H₂O

Two waters need 4 H and 2 O. Left side: 2 H₂ gives 4 H, and O₂ gives 2 O. So 2 H₂ + O₂ → 2 H₂O.

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Which principle requires us to balance chemical equations?

  1. Conservation of mass
  2. Conservation of energy
  3. Conservation of momentum
  4. Conservation of charge
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Correct answer: A. Conservation of mass

Atoms are neither created nor destroyed in chemical reactions so the count of each kind of atom (and hence the total mass) must match on both sides.

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