Chemical Equilibrium
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Questions and Answers

What is the correct equilibrium constant expression for the reaction C(s) + CO2(g) ⇌ 2CO(g)?

  • (1-x)/(2x)^2
  • (1+x)/(2x)^2
  • (2x)/(1-x)^2 (correct)
  • (2x)/(1+x)^2

    • What is Le-Chatelier's principle?

  • A system in equilibrium readjusts itself to counteract the effect of the change (correct)
  • A system in equilibrium gets disturbed when concentration, temperature or pressure is changed
  • The equilibrium constant remains constant even if the concentration, temperature or pressure is changed
  • A change in concentration, temperature or pressure has no effect on the system

    • For a reaction in which the number of moles of products is greater than that of reactants, what is the effect of increasing pressure on the system?

  • Reaction becomes irreversible
  • Equilibrium shifts towards the reactants (correct)
  • No effect on the equilibrium
  • Equilibrium shifts towards the products

    • What happens to the equilibrium when a system is subjected to a change in concentration, temperature or pressure?

    <p>The equilibrium gets disturbed and the system readjusts itself to its original state</p> Signup and view all the answers

    What is the significance of Le-Chatelier's principle?

    <p>It is used to predict the effect of change in concentration, temperature or pressure on a system in equilibrium</p> Signup and view all the answers

    What happens to the melting point of sulphur at higher pressure?

    <p>It increases</p> Signup and view all the answers

    What is the effect of high temperature on the solubility of NH4Cl?

    <p>Solubility increases</p> Signup and view all the answers

    What happens to the boiling point of water at higher pressure?

    <p>It increases</p> Signup and view all the answers

    What is the effect of an increase in temperature on the solubility of CaCl2?

    <p>Solubility decreases</p> Signup and view all the answers

    What is the purpose of flash evaporation in concentrating certain aqueous solutions?

    <p>To concentrate the solution quickly</p> Signup and view all the answers

    What happens to the volume when sulphur melts?

    <p>It increases</p> Signup and view all the answers

    What is the effect of increasing the pressure in the reaction: 2 NO + O2 ⇌ 2 NO2 + 27.8 kcal?

    <p>The reaction will shift in the forward direction</p> Signup and view all the answers

    In the reaction N2 + 3H2 ⇌ 2 NH3 + 22 kcal, what will be the effect of increasing the temperature?

    <p>The reaction will shift in the reverse direction</p> Signup and view all the answers

    In the reaction PCl5 ⇌ PCl3 + Cl2 - 15 kcal, what will be the effect of adding more PCl5?

    <p>The reaction will shift in the reverse direction</p> Signup and view all the answers

    In the reaction Ice ⇌ Water - x kcal, what will be the effect of increasing the pressure?

    <p>More water will be formed</p> Signup and view all the answers

    What is the significance of Le-Chatelier's principle in chemical and physical systems?

    <p>It has a great significance in chemical, physical systems, and everyday life in a state of equilibrium</p> Signup and view all the answers

    In the reaction 2 NO + O2 ⇌ 2 NO2 + 27.8 kcal, what will be the effect of increasing the volume of the container?

    <p>The reaction will shift in the reverse direction</p> Signup and view all the answers

    If a system is in equilibrium and the concentration of one of the reactants is increased, what will happen to the equilibrium?

    <p>The equilibrium will shift to the right.</p> Signup and view all the answers

    What is the significance of the value of 'a' in the equilibrium constant expression?

    <p>It is the molar concentration of the component in solution.</p> Signup and view all the answers

    A system is in equilibrium and the pressure is increased. What will happen to the equilibrium?

    <p>The equilibrium will shift to the direction of fewer moles of gas.</p> Signup and view all the answers

    What is the purpose of Le-Chatelier's principle?

    <p>To predict the effect of changes in concentration, temperature or pressure on a system in equilibrium.</p> Signup and view all the answers

    For a reaction in which the number of moles of products is less than that of reactants, what is the effect of increasing pressure on the system?

    <p>The equilibrium will shift to the left.</p> Signup and view all the answers

    What is the correct equilibrium constant expression for the reaction NH4HS(s) ⇌ NH3(g) + H2S(g)?

    <p>K = $P_{NH3}P_{H2S} / (1-x)$</p> Signup and view all the answers

    What is the effect of increasing the pressure on the equilibrium position of the reaction A + B ⇌ C + D, where Δn = (c + d) - (a + b) = -ve?

    <p>The equilibrium position shifts to the right.</p> Signup and view all the answers

    What is the effect of increasing the concentration of C and/or D on the equilibrium position of the reaction A + B ⇌ C + D, where Δn = (c + d) - (a + b) = 0?

    <p>The equilibrium position shifts to the left.</p> Signup and view all the answers

    What is the effect of adding a catalyst to the equilibrium position of the reaction A + B ⇌ C + D?

    <p>The equilibrium position remains unchanged.</p> Signup and view all the answers

    What is the effect of increasing the temperature on the equilibrium constant of the reaction 2SO2 + O2 ⇌ 2SO3 + 45 kcal, where ΔH = -ve?

    <p>The equilibrium constant decreases.</p> Signup and view all the answers

    What is the effect of increasing the pressure on the equilibrium position of the reaction 2NO ⇌ N2 + O2, where Δn = 0?

    <p>The equilibrium position remains unchanged.</p> Signup and view all the answers

    What is the effect of increasing the concentration of A and/or B on the equilibrium position of the reaction A + B ⇌ C + D, where Δn = (c + d) - (a + b) = +ve?

    <p>The equilibrium position shifts to the right.</p> Signup and view all the answers

    What is the effect of increasing the pressure on the reaction 2 NO + O2 ⇌ 2 NO2 + 27.8 kcal?

    <p>The reaction will shift towards the products.</p> Signup and view all the answers

    In the reaction N2 + 3H2 ⇌ 2 NH3 + 23 kcal, what will be the effect of adding more N2?

    <p>The reaction will shift towards the products.</p> Signup and view all the answers

    What is the effect of increasing the temperature on the reaction PCl5 ⇌ PCl3 + Cl2 - 15 kcal?

    <p>The reaction will shift towards the reactants.</p> Signup and view all the answers

    In the Ice ⇌ Water - x kcal reaction, what will be the effect of increasing the pressure?

    <p>The reaction will shift towards the ice.</p> Signup and view all the answers

    What is the effect of increasing the volume of the container on the reaction 2 NO + O2 ⇌ 2 NO2 + 27.8 kcal?

    <p>The reaction will shift towards the reactants.</p> Signup and view all the answers

    What is the effect of adding more PCl5 on the reaction PCl5 ⇌ PCl3 + Cl2 - 15 kcal?

    <p>The reaction will shift towards the products.</p> Signup and view all the answers

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