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UP Board Class 10 Chemical Reactions and Equations — practice questions — page 3

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 61–78 of 78.

Oxidation in chemistry means:Read the answer and worked solution →Respiration is which kind of reaction?Read 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

Oxidation in chemistry means:

  1. Loss of oxygen
  2. Gain of electrons
  3. Gain of oxygen or loss of electrons
  4. Splitting of the compound
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Correct answer: C. Gain of oxygen or loss of electrons

Oxidation is defined as gain of oxygen OR loss of electrons. The opposite of reduction.

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Respiration is which kind of reaction?

  1. Endothermic
  2. Neither
  3. Photochemical
  4. Exothermic
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Correct answer: D. Exothermic

Respiration releases energy (heat + ATP). It is exothermic; ΔH < 0.

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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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