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Andhra Pradesh SSC (Class 10) Chemical Reactions and Equations — practice questions — page 2

Explore 43 free Chemical Reactions and Equations questions in Andhra Pradesh SSC (Class 10) Science and Technology. Open each question or exercise to read its content, reference answers and available explanation.

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Chemical Reactions and Equations questions and exercises with answers

Showing questions 31–43 of 43.

Silver objects turn black on long exposure to air mainly because:Read the answer and worked solution →CaO + H₂O → Ca(OH)₂ is an example of:Read the answer and worked solution →Zn + CuSO₄ → ZnSO₄ + Cu is a:Read the answer and worked solution →Oxidation in chemistry means:Read the answer and worked solution →Respiration is which kind of reaction?Read the answer and worked solution →Match each reaction type to an example.Read the answer and worked solution →Match each chemical reaction to its type.Read the answer and worked solution →Balance the combustion of methane.Read the answer and worked solution →Balance magnesium burning in oxygen.Read the answer and worked solution →Sort compounds by their bond typeRead the answer and worked solution →Order what happens during electrolysisRead the answer and worked solution →Sort the formulas by bondingRead the answer and worked solution →Match molecules to their bond typeRead the answer and worked solution →

Worked practice questions

Silver objects turn black on long exposure to air mainly because:

  1. Ag combines with H₂S to form Ag₂S
  2. Ag combines with O₂ to form Ag₂O
  3. Ag reacts with CO₂ to form Ag₂CO₃
  4. Ag dissolves in moisture slowly
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Correct answer: A. Ag combines with H₂S to form Ag₂S

Atmospheric hydrogen sulfide reacts with silver to form black silver sulfide (Ag₂S). This is the corrosion mechanism for silver — not simple oxidation by O₂.

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CaO + H₂O → Ca(OH)₂ is an example of:

  1. Combination
  2. Decomposition
  3. Displacement
  4. Double displacement
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Correct answer: A. Combination

Two reactants combine into a single product. This is a combination reaction.

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Zn + CuSO₄ → ZnSO₄ + Cu is a:

  1. Decomposition reaction
  2. Displacement reaction
  3. Combination reaction
  4. Neutralisation reaction
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Correct answer: B. Displacement reaction

More reactive zinc displaces less reactive copper from copper sulphate. Displacement reaction.

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