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

Explore 77 free Chemical Reactions and Equations questions in Andhra Pradesh SSC (Class 10) Science. 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 31–60 of 77.

Balance: Fe + H₂O → Fe₃O₄ + H₂.Read the answer and worked solution →In Zn + 2 HCl → ZnCl₂ + H₂, the state symbol for HCl in solution is:Read the answer and worked solution →CaCO₃ → CaO + CO₂ is an example of which type of reaction?Read the answer and worked solution →In Fe + CuSO₄ → FeSO₄ + Cu, what kind of reaction is this?Read the answer and worked solution →2 H₂ + O₂ → 2 H₂O is a:Read the answer and worked solution →In the reaction Na₂SO₄ + BaCl₂ → BaSO₄ + 2 NaCl, what is observed?Read the answer and worked solution →Which of these is an endothermic reaction?Read the answer and worked solution →Which reaction does NOT need heat to proceed?Read the answer and worked solution →In the reaction CuO + H₂ → Cu + H₂O, the substance that is reduced is:Read the answer and worked solution →A reaction in which one substance is oxidised and another reduced is called a:Read the answer and worked solution →Rusting of iron requires which two conditions?Read the answer and worked solution →Chips packets are flushed with nitrogen mainly to:Read the answer and worked solution →In ZnO + C → Zn + CO, the reducing agent is:Read the answer and worked solution →Silver objects turn black on long exposure to air mainly because:Read the answer and worked solution →Carbon forms bonds by:Read the answer and worked solution →Diamond and graphite differ because they are:Read the answer and worked solution →The general formula for the alkane series is: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 →Which of the following pairs are members of the same homologous series?Read the answer and worked solution →In alkaline KMnO₄, ethanol is converted to: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 soap molecule cleans greasy clothes 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 →

Worked practice questions

Balance: Fe + H₂O → Fe₃O₄ + H₂.

  1. 3 Fe + 4 H₂O → 3 Fe₃O₄ + 4 H₂
  2. 3 Fe + 4 H₂O → Fe₃O₄ + 4 H₂
  3. 3 Fe + H₂O → Fe₃O₄ + H₂
  4. Fe + 4 H₂O → Fe₃O₄ + 4 H₂
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Correct answer: B. 3 Fe + 4 H₂O → Fe₃O₄ + 4 H₂

3 Fe on the left to match 3 in Fe₃O₄. 4 H₂O gives 4 O (match) and 8 H, balanced by 4 H₂ on the right.

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In Zn + 2 HCl → ZnCl₂ + H₂, the state symbol for HCl in solution is:

  1. aqueous (aq)
  2. liquid (l)
  3. gas (g)
  4. solid (s)
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Correct answer: A. aqueous (aq)

HCl in water is an aqueous solution, written (aq).

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CaCO₃ → CaO + CO₂ is an example of which type of reaction?

  1. doubledisplacement
  2. decomposition
  3. combination
  4. displacement
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Correct answer: B. decomposition

A single reactant breaks into two products. This is a decomposition reaction.

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