Heat Of Reaction(General Knowledge > General Science ) Questions and Answers

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.
Explanation:-
Answer: 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
Explanation:-
Answer: 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
Explanation:-
Answer: 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
Explanation:-
Answer: Option A. -> H = mc θ\thetaθ
Question 5. Neutralisation reactions
  1.    endothermic
  2.    exothermic
Explanation:-
Answer: 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
Explanation:-
Answer: 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
Explanation:-
Answer: 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
Explanation:-
Answer: 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
Explanation:-
Answer: 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
Explanation:-
Answer: Option A. -> enthalpy change
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