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UP Board Class 10 Chemical Reactions and Equations — practice questions — page 2

Explore 78 free Chemical Reactions and Equations questions in UP Board 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 78.

The common name of ethanoic acid, a dilute solution of which is called vinegar, is:Read the answer and worked solution →The reaction of an alcohol with a carboxylic acid in the presence of an acid catalyst, forming a sweet-smelling ester, is called:Read the answer and worked solution →The addition of hydrogen to an unsaturated hydrocarbon to form a saturated one uses a catalyst of:Read the answer and worked solution →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 →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 →

Worked practice questions

The common name of ethanoic acid, a dilute solution of which is called vinegar, is:

  1. lactic acid
  2. acetic acid
  3. formic acid
  4. citric acid
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Correct answer: B. acetic acid

Ethanoic acid is commonly called acetic acid; 5–8% solution is vinegar.

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The reaction of an alcohol with a carboxylic acid in the presence of an acid catalyst, forming a sweet-smelling ester, is called:

  1. esterification
  2. saponification
  3. substitution
  4. hydrogenation
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Correct answer: A. esterification

Esterification: alcohol + carboxylic acid → ester + water, acid-catalysed.

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The addition of hydrogen to an unsaturated hydrocarbon to form a saturated one uses a catalyst of:

  1. iron oxide
  2. copper sulphate
  3. manganese dioxide
  4. nickel or palladium
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Correct answer: D. nickel or palladium

Hydrogenation adds H₂ across double bonds using Ni/Pd catalyst (e.g. vegetable oil → vanaspati).

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