Lakshya Education MCQs

Question: The heat change for the reaction, C(s) + 2S(s) → CS₂(l), is 104.2 kJ. It represents the heat of
Options:
A.Formation
B.Solution
C.Combustion
D.Fusion
Answer: Option A

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More Questions on This Topic :

Question 1. Which of the following is not used for computing latent heat of vaporisation?
  1.    Clausius-Clayperon equation
  2.    Reference substance plots based on Durhing & Othmer plots
  3.    Kistyakowasky's equation
  4.    Hess
Answer: Option D
Question 2. 2 litres of nitrogen at N.T.P. weighs __________ gms.
  1.    14
  2.    2.5
  3.    28
  4.    1.25
Answer: Option B
Question 3. The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface. This statement pertaining to the solubility of gases in liquid is the __________ law.
  1.    Raoult's
  2.    Henry's
  3.    Amgat's
  4.    None of these
Answer: Option B
Question 4. The average value of heat of neutralisation of dilute solution of strong acids and strong bases is about __________ kcal/kg.mole of water formed.
  1.    6680
  2.    13360
  3.    2481
  4.    97302
Answer: Option B
Question 5. The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg.?
  1.    0.2
  2.    0.1
  3.    0.4
  4.    0.6
Answer: Option D
Question 6. One Newton is equal to __________ dynes.
  1.    10²
  2.    10³
  3.    10⁴
  4.    10⁵
Answer: Option D

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