35 Questions
What is the correct equilibrium constant expression for the reaction C(s) + CO2(g) ⇌ 2CO(g)?
(2x)/(1-x)^2
What is Le-Chatelier's principle?
A system in equilibrium readjusts itself to counteract the effect of the change
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?
Equilibrium shifts towards the reactants
What happens to the equilibrium when a system is subjected to a change in concentration, temperature or pressure?
The equilibrium gets disturbed and the system readjusts itself to its original state
What is the significance of Le-Chatelier's principle?
It is used to predict the effect of change in concentration, temperature or pressure on a system in equilibrium
What happens to the melting point of sulphur at higher pressure?
It increases
What is the effect of high temperature on the solubility of NH4Cl?
Solubility increases
What happens to the boiling point of water at higher pressure?
It increases
What is the effect of an increase in temperature on the solubility of CaCl2?
Solubility decreases
What is the purpose of flash evaporation in concentrating certain aqueous solutions?
To concentrate the solution quickly
What happens to the volume when sulphur melts?
It increases
What is the effect of increasing the pressure in the reaction: 2 NO + O2 ⇌ 2 NO2 + 27.8 kcal?
The reaction will shift in the forward direction
In the reaction N2 + 3H2 ⇌ 2 NH3 + 22 kcal, what will be the effect of increasing the temperature?
The reaction will shift in the reverse direction
In the reaction PCl5 ⇌ PCl3 + Cl2 - 15 kcal, what will be the effect of adding more PCl5?
The reaction will shift in the reverse direction
In the reaction Ice ⇌ Water - x kcal, what will be the effect of increasing the pressure?
More water will be formed
What is the significance of Le-Chatelier's principle in chemical and physical systems?
It has a great significance in chemical, physical systems, and everyday life in a state of equilibrium
In the reaction 2 NO + O2 ⇌ 2 NO2 + 27.8 kcal, what will be the effect of increasing the volume of the container?
The reaction will shift in the reverse direction
If a system is in equilibrium and the concentration of one of the reactants is increased, what will happen to the equilibrium?
The equilibrium will shift to the right.
What is the significance of the value of 'a' in the equilibrium constant expression?
It is the molar concentration of the component in solution.
A system is in equilibrium and the pressure is increased. What will happen to the equilibrium?
The equilibrium will shift to the direction of fewer moles of gas.
What is the purpose of Le-Chatelier's principle?
To predict the effect of changes in concentration, temperature or pressure on a system in equilibrium.
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?
The equilibrium will shift to the left.
What is the correct equilibrium constant expression for the reaction NH4HS(s) ⇌ NH3(g) + H2S(g)?
K = $P_{NH3}P_{H2S} / (1-x)$
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?
The equilibrium position shifts to the right.
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?
The equilibrium position shifts to the left.
What is the effect of adding a catalyst to the equilibrium position of the reaction A + B ⇌ C + D?
The equilibrium position remains unchanged.
What is the effect of increasing the temperature on the equilibrium constant of the reaction 2SO2 + O2 ⇌ 2SO3 + 45 kcal, where ΔH = -ve?
The equilibrium constant decreases.
What is the effect of increasing the pressure on the equilibrium position of the reaction 2NO ⇌ N2 + O2, where Δn = 0?
The equilibrium position remains unchanged.
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?
The equilibrium position shifts to the right.
What is the effect of increasing the pressure on the reaction 2 NO + O2 ⇌ 2 NO2 + 27.8 kcal?
The reaction will shift towards the products.
In the reaction N2 + 3H2 ⇌ 2 NH3 + 23 kcal, what will be the effect of adding more N2?
The reaction will shift towards the products.
What is the effect of increasing the temperature on the reaction PCl5 ⇌ PCl3 + Cl2 - 15 kcal?
The reaction will shift towards the reactants.
In the Ice ⇌ Water - x kcal reaction, what will be the effect of increasing the pressure?
The reaction will shift towards the ice.
What is the effect of increasing the volume of the container on the reaction 2 NO + O2 ⇌ 2 NO2 + 27.8 kcal?
The reaction will shift towards the reactants.
What is the effect of adding more PCl5 on the reaction PCl5 ⇌ PCl3 + Cl2 - 15 kcal?
The reaction will shift towards the products.
This quiz covers the concepts of chemical equilibrium, Le-Chatelier's principle, and equilibrium constants. It also includes problems on the effect of pressure and concentration on equilibrium. Test your knowledge of these fundamental chemistry concepts!
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