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Tamil Nadu SSLC (Class 10) Chemical Reactions and Equations — practice questions — page 2

Explore 37 free Chemical Reactions and Equations questions in Tamil Nadu SSLC (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 31–37 of 37.

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 →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 →

Worked practice questions

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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A soap molecule cleans greasy clothes mainly because:

  1. bleaches grease using oxygen
  2. dissolves grease completely
  3. kills the grease chemically
  4. tail in grease, head in water
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Correct answer: D. tail in grease, head in water

The hydrophobic tail buries into grease the hydrophilic head pokes into water. The arrangement forms micelles that suspend dirt in water for rinsing.

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The functional group present in alcohols is:

  1. –OH (hydroxyl)
  2. –CO– (ketone)
  3. –CHO (aldehyde)
  4. –COOH (carboxyl)
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Correct answer: A. –OH (hydroxyl)

Alcohols carry the hydroxyl (–OH) functional group.

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More Chemistry topics

Periodic Table & Periodic PropertiesUnit 4C1: Hydrocarbons and Carbon CompoundsMetallurgyUnit 1C1: Periodic Trends in Atomic PropertiesElements, Compounds and Mixtures