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ICSE Class 10 Chemical Reactions and Equations — practice questions — page 2

Explore 50 free Chemical Reactions and Equations questions in ICSE Class 10 Chemistry. 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 31–50 of 50.

Which of the following is an unsaturated hydrocarbon?Read the answer and worked solution →The common name of ethanoic acid, a dilute solution of which is called vinegar, is:Read the answer and worked solution →The flame produced when a saturated hydrocarbon burns in plentiful air is:Read the answer and worked solution →A soap molecule cleans greasy clothes mainly because:Read the answer and worked solution →The functional group present in alcohols is:Read the answer and worked solution →The functional group present in carboxylic acids is:Read the answer and worked solution →Match each reaction type to an example.Read the answer and worked solution →When a single reactant breaks down into two or more products, the reaction is called:Read the answer and worked solution →Rusting of iron is an example of:Read the answer and worked solution →An exothermic reaction is one in which heat is:Read the answer and worked solution →Zn + CuSO₄ → ZnSO₄ + Cu is an example of:Read the answer and worked solution →The chemical formula of slaked lime is:Read the answer and worked solution →The reaction AgNO₃ + NaCl → AgCl + NaNO₃ is best classified as:Read the answer and worked solution →The substance which gets oxidised in the reaction CuO + H₂ → Cu + H₂O is:Read the answer and worked solution →Galvanisation, the coating of iron with a thin layer of another metal to prevent rusting, uses:Read the answer and worked solution →Quicklime (CaO) reacts vigorously with water to form slaked lime. This reaction is:Read the answer and worked solution →Which functional group is present in ethanoic acid?Read the answer and worked solution →Balance magnesium burning in oxygen.Read the answer and worked solution →Match each chemical observation with the precipitate formed:Read the answer and worked solution →Spot the one that does not fitRead the answer and worked solution →

Worked practice questions

Which of the following is an unsaturated hydrocarbon?

  1. Methane (CH4)
  2. Propane (C3H8)
  3. Ethene (C2H4)
  4. Butane (C4H10)
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Correct answer: C. Ethene (C2H4)

1. Saturated hydrocarbons have only C-C single bonds. 2. Methane, propane and butane are alkanes (CnH(2n+2)). 3. Ethene has a C=C double bond (C2H4) and follows CnH(2n). 4. So ethene is the unsaturated hydrocarbon here. 5. The double bond makes it more chemically reactive than alkanes. _Source: syllabus Science Ch 4 'Carbon and its Compounds' (byjus.com extract)_

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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 flame produced when a saturated hydrocarbon burns in plentiful air is:

  1. Clean and blue
  2. Smoky and yellow
  3. Green and bright
  4. Black and dim
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Correct answer: A. Clean and blue

1. Saturated hydrocarbons have higher C:H ratio favouring complete combustion. 2. Complete combustion gives a clean blue flame. 3. Unsaturated hydrocarbons or limited air give smoky yellow flames. 4. So the answer is clean and blue. _Source: syllabus Science Ch 4 'Carbon and its Compounds' (byjus.com extract)_

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