Class 12 Premium Revision Notes Alcohols Phenols And Ethers.
Class notes Science chemistry Chemistry : Textbook For Class Xii
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chemistry
neet 2022
Equilibrium established in physical reactions.
The chemical reactions which takes place in both
directions are called reversible reactions It is dynamic in nature.
In a reversible reaction both reactants and
products are unstable.
Here vapour pressure is constant at a constant temp
Equilibrium is the end state of a reversible reaction.
Equilibrium is established only in a closed container.
At equilibrium, the rate of forward and backward Established only at a constant temparature
reactions are equal. (m.p of solid ie, freeging point of liquid)
At equilibrium, the concentration of reactants & Ice-waler equilibrium established at ooc.
products becomes constant.
Established only in a Saturated solution
eg: Saturated sugar solution.
Equilibrium
foawand
product
Sugar (dissolved) Sugar (undissolved)
equilibrium
Rate Conc
reactant Here solubility depends upon pressure (Henry’s law)
backward
eg: Soda water
Time Time
CO2 (dissolved) CO2 (undissolved)
For the equilibrium A B, the variation of the rate of the forward (a) & Which of the given statements does not elucidate the equilibrium state
reverse (b) reaction with time is given by precisely?
(A) The equilibrium can be approached from either direction.
(B) The equilibrium can be attained only if the system is an isolated system.
JEE 2020 (C) The free energy change at constant pressure and temperature is zero.
(D) It is dynamic in nature.
chemical equilibrium
3. value of k depends only on temparature. If they are in solid or liquid phase, K can be represented as Kc.
If they are in gaseous or aqueous phase, K can be represented as Kp
4. If K for the reaction aA + bB cC+dD is K, then For a general reaction
K for the reaction cc+dD aA+ bB will be 1K
aA + bB cC + dD
5. If K for the reaction aA + bB cC+dD is K, then
K for the reaction naA+ nbB ncC + ndD will be (K)n [C]C [D]d PCc PDd
Kc = & Kp =
[A]a [B]b PAa PBb
6. During the addition of two reactants having equilibrium
constants K1 & K2, then the net Constant K = K1 x K2
Kp = Kc (RT) n n = np - nR
7. During the subtraction of a reaction having constant K2 from a
reaction having constant K1, then the net constant K = K1/K2
n
8. If Q<K, the reaction will proceed in forward direction Unit of Kc = (mol/L)
n
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