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General Science

HEAT OF REACTION MCQs

Total Questions : 26

Page 1 of 3 pages
Question 1. What is precipitation reaction?
  1.    Two different aqueous soluble salts are mixed to form a soluble salt.
  2.    Two different aqueous soluble salts are mixed to form an insoluble salt.
  3.    Two different aqueous soluble salts are mixed to form an insoluble salt and a soluble salt.
  4.    One aqueous soluble salts are mixed with one insoluble salt to form an insoluble salt.
 Discuss Question
Answer is Option C. -> Two different aqueous soluble salts are mixed to form an insoluble salt and a soluble salt.
Question 2. Calculate the amount of energy needed to convert 250
  1.    833 kJ
  2.    165 kJ
  3.    782 kJ
  4.    251 kJ
 Discuss Question
Answer is Option C. -> 782 kJ
Question 3. A chemical reaction that absorbs heat from the surroundings is said to be __________ and has a __________ ΔH at constant pressure
  1.    endothermic; positive
  2.    endothermic; negative
  3.    exothermic; negative
  4.    exothermic; positive
 Discuss Question
Answer is Option A. -> endothermic; positive
Question 4. What is the formula for calculating heat?
  1.    H = mc θ\thetaθ
  2.    H = ΔH x n
  3.    H = ΔH x mass
  4.    products - reactants
 Discuss Question
Answer is Option A. -> H = mc θ\thetaθ
Question 5. Neutralisation reactions
  1.    endothermic
  2.    exothermic
 Discuss Question
Answer is Option B. -> exothermic
Question 6. The ______________is required to break the bonds of the reactants
  1.    Carbonic energy
  2.    Activation energy
  3.    Plutonic energy
  4.    Energi Gaib
 Discuss Question
Answer is Option B. -> Activation energy
Question 7. Which one of the following reaction(s) are (is) exothermic?
  1.    combustion of gases
  2.    Freezing of water
  3.    Melting of salt
  4.    Both A & B
 Discuss Question
Answer is Option D. -> Both A & B
Question 8. Which one of the following reactions are endothermic?
  1.    Fe(s)→Fe(l)
  2.    2C+2H2+20kcal/mol → C2H
  3.    Ba(OH)2+CO2 → BaCO3+H2O+heat
  4.    Both A & B
 Discuss Question
Answer is Option D. -> Both A & B
Question 9. The device which is used to measure heat of reaction is ……………………
  1.    calorimeter
  2.    Ammeter
  3.    Energy meter
  4.    Wattmeter
 Discuss Question
Answer is Option A. -> calorimeter
Question 10. The heat change at the end of a chemical reaction under constant pressure is called…………………………………
  1.    enthalpy change
  2.    Hendothermic reaction
  3.    Both A & B
  4.    None of these
 Discuss Question
Answer is Option A. -> enthalpy change
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