Chemical Reactions and Equations - Class 10th Science

MCQs: 1

Question: 1: Which of the following does denote chemical reaction take place?

  1. Formation of new product
  2. Change of state
  3. Evolution of heat
  4. Reversible reaction

Answer: (a) Formation of new product

Question: 2: Which of the following reaction is also be termed as thermal decomposition reaction?

  1. Combination reaction
  2. Decomposition reaction
  3. Displacement reaction
  4. Double displacement reaction

Answer: (b) Decomposition reaction

Question: 3: Which of the following is termed as oxidizing agent?

  1. Which gives oxygen
  2. Which removes oxygen
  3. Which gives hydrogen
  4. All of the above

Answer: (a) Which gives oxygen

Question: 4: Which of the following termed as reducing agent?

  1. Which gives oxygen
  2. Which removes oxygen
  3. Which removes hydrogen
  4. All of the above

Answer: (b) Which removes oxygen

Question: 5: Which of the following does show oxidation reaction?

  1. Gain of oxygen
  2. Loss of oxygen
  3. Gain of hydrogen
  4. None of the above

Answer: (a) Gain of oxygen

Question: 6: Which of the following does show reduction reaction?

  1. Gain of oxygen
  2. Loss of oxygen
  3. Loss of hydrogen
  4. None of the above

Answer: (b) Loss of oxygen

Question: 7: Which of the reaction is used in black and white photography?

  1. Combination reaction
  2. Decomposition reaction
  3. Displacement reaction
  4. Oxidation reaction

Answer: (b) Decomposition reaction

Question: 8: In which of the following heat is evolved?

  1. Combination reaction
  2. Decomposition reaction
  3. Displacement reaction
  4. Double displacement reaction

Answer: (a) Combination reaction

Question: 9: In which of the following heat is absorbed generally?

  1. Combination reaction
  2. Decomposition reaction
  3. Displacement reaction
  4. Double displacement reaction

Answer: (b) Decomposition reaction

Question: 10: Which of the following is termed as endothermic reaction?

  1. Reaction in which heat is evolved
  2. Reaction in which heat is absorbed
  3. Reaction in which there is loss of oxygen
  4. Reaction in which there is gain of hydrogen

Answer: (b) Reaction in which heat is absorbed

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