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Andhra Pradesh SSC (Class 10) Chemical Reactions and Equations — practice questions — page 3

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 61–77 of 77.

CLASS10 · Chemistry · Carbon Compounds — Functional GroupRead the answer and worked solution →How many valence electrons does a carbon atom have?Read the answer and worked solution →Why does carbon form covalent rather than ionic bonds?Read the answer and worked solution →Which is an allotrope of carbon?Read the answer and worked solution →The general formula of an alkane is:Read the answer and worked solution →Which functional group is present in ethanoic acid?Read the answer and worked solution →Which property of carbon allows it to form long chains?Read the answer and worked solution →The flame produced when a saturated hydrocarbon burns in plentiful air is:Read the answer and worked solution →The chemical reaction where alcohol and carboxylic acid form a fruity-smelling ester is called:Read the answer and worked solution →Diamond conducts heat well but does NOT conduct electricity because:Read the answer and worked solution →Graphite is soft and a good conductor of electricity because:Read the answer and worked solution →Why do soaps NOT work well in hard water?Read the answer and worked solution →Which of the following is an unsaturated hydrocarbon?Read the answer and worked solution →How can ethanol be converted to ethene?Read the answer and worked solution →Which is the bond pattern of nitrogen molecule N2?Read the answer and worked solution →Match each science fact to the correct answerRead the answer and worked solution →Fill in the chemistry basicsRead the answer and worked solution →

Worked practice questions

CLASS10 · Chemistry · Carbon Compounds — Functional Group

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Matching pairs
  1. A
    Alcohol
    B
    −OH (hydroxyl)
  2. A
    Aldehyde
    B
    −CHO
  3. A
    Ketone
    B
    >C=O
  4. A
    Carboxylic acid
    B
    −COOH
  5. A
    Ether
    B
    −O−
  6. A
    Amine
    B
    −NH₂
Instructions
Match each functional group to its name.

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How many valence electrons does a carbon atom have?

  1. Four
  2. Two
  3. Six
  4. Eight
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Correct answer: A. Four

1. Carbon has atomic number 6 with electronic configuration 2, 4. 2. The outermost shell holds four electrons. 3. These four valence electrons let carbon form four covalent bonds. 4. So the answer is four. _Source: syllabus Science Ch 4 'Carbon and its Compounds' (byjus.com extract)_

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Why does carbon form covalent rather than ionic bonds?

  1. It is too heavy for ions
  2. It can share four electrons to fill its octet
  3. It does not have valence electrons
  4. Its nucleus is too small
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Correct answer: B. It can share four electrons to fill its octet

1. Forming C⁴⁺ or C⁴⁻ would need very large amounts of energy. 2. Carbon instead shares its four valence electrons with other atoms. 3. Sharing fills the outer shell up to eight electrons. 4. So carbon makes covalent bonds rather than ions. _Source: syllabus Science Ch 4 'Carbon and its Compounds' (byjus.com extract)_

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