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Indian Navy AA (Artificer Apprentice) Carbon and its Compounds — practice questions

Explore 5 free Carbon and its Compounds questions in Indian Navy AA (Artificer Apprentice) Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Carbon and its Compounds questions and exercises with answers

Showing questions 1–5 of 5.

A soap molecule cleans greasy clothes mainly because:Read the answer and worked solution →Why do soaps NOT work well in hard water?Read the answer and worked solution →Why are the chemical properties of all members of a homologous series similar?Read the answer and worked solution →Which is NOT an allotrope of carbon?Read the answer and worked solution →Vinegar is a solution ofRead the answer and worked solution →

Worked practice questions

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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Why do soaps NOT work well in hard water?

  1. They evaporate under typical conditions
  2. They form insoluble salts with Ca and Mg ions
  3. They turn alkaline
  4. They become acidic
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Correct answer: B. They form insoluble salts with Ca and Mg ions

1. Hard water contains dissolved calcium and magnesium salts. 2. Soap reacts with these ions instead of cleaning fabrics. 3. Insoluble curdy precipitates of Ca and Mg salts form. 4. These precipitates do not foam and do not remove dirt. 5. So soaps lose cleaning power in hard water. _Source: syllabus Science Ch 4 'Carbon and its Compounds' (byjus.com extract)_

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Why are the chemical properties of all members of a homologous series similar?

  1. They have the same molecular mass
  2. They are all gases
  3. They have the same melting point
  4. They share the same functional group
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Correct answer: D. They share the same functional group

1. A homologous series is built around one functional group. 2. Members differ only by a -CH2- unit. 3. The functional group determines chemical behaviour. 4. Identical functional groups give identical chemical properties. 5. Physical properties such as melting point change with chain length. _Source: syllabus Science Ch 4 'Carbon and its Compounds' (byjus.com extract)_

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