Equilibria - Phase, Chemical & Ionic
20 Questions MCQ Test GATE Chemistry Mock Test Series | Equilibria - Phase, Chemical & Ionic
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If K < Q. where, K = equilibrium constant.
Q = reaction quotient
The reaction move in which direction to achieve equilibrium
Q = reaction quotient
The reaction move in which direction to achieve equilibrium
Application of equilibrium constant
K > Q ⇒ forward direction
K < Q ⇒ backward direction
K = Q ⇒ at equilibrium
For the reaction, 
On increasing pressure equilibrium shift to
On increasing pressure equilibrium shift to Le-Chatelier’s principle. On increasing pressure equilibrium shift in the directions where pressure decrease and so in this case it moves in forward direction.
The effect of which variable is ignored for the study of two-component system
Reduced phase rule,
F = C - P + 1
Pressure is ignored as only condensed phases studied for two-components system
A sample of propane (C3H8) placed in a closed vessel together with an amount of O2, that is 3-times the amount needed to completely oxidize the propane to CO2 and H2O at constant temperature. Calculate the mole of fraction of each component in the resulting mixture after oxidation assuming that the H2O is present as a gas?
Let initially'm' mole of propane present when reaction is complete then
nO2 =15 m mol
When reaction is complete then
∴ 
For the below diagram, which statement is correct
dG = VdP - SdT + μdN
A solution is 0.1M in CI- and 0.001M in CrO2-4. If solid AgNO3, is gradually added to this solution, the one which precipitate first is
Since amount of Ag+ needed to precipitate AgCl is less therefore, it will precipitate out first.
At 39.9°C. a solution of ethanol 
and iso-octane 
foms a vappour phase with Y1 = 0.6667 at a total pressure of 185.9 torr. The activity coefficient of ethanol is __________ (Hint: X1 = mole fraction in solution, Y1 = mole fraction vapour phase) (Round off to two decimal places).
( a temperature lower than the triple point temperature)
(d) Gibb's energies at a temperature greater than critical temperature this case G(P) varies smoothly with P. There is no discontinuity in the slope in tliis case because only a single fluid phase is involved.
Phase-diagram that shown below represents the congruent melting point. Which of the following statements are not correct?
(A) There will be three freezing point curves
(B) Congruent melting point always lies above the melting point of pure components
(C) Congruent melting point diagram always contains equimolar amounts of A and B
(D) There are two eutectic point (in above figure)
(A) Yes, Ac. BE and C'DE are three freezing point curve.
(B) Melting point of the compound formed is not always lie above it may be above, below and in-betweeen them elting point of the pure components.
(C) It is not necessary that the congruent melting point phase diagram always contains equimolar of both component
(D) C and E are 2-Eutectic point
(Therefore. Eutectinc point means easy melt's)
In an ideal solution of A and B 3.50 mol are in the liquid phase and 4.75 mol are in the gaseous phase. The overall composition of the system is ZA = 0.300 and XA = 0.250. The mole fraction in vapour phase of YA is ____________(round off to two decimal places).
is expressed as
Total number of moles = 1 + 3 + 2 = 6
⇒ 
The degree of freedom for a two component system, at congruent melting point is
Degree of freedom at congruent melting point is zero.
For an indicator, the value of pH is 2 when half of the indicator is present in unionised form. The percentage of indicator in unionised form in a solution of 4.0x10-3 M hydrogen ion concentration is
For indicators
When 
pH = 2
⇒ 
Or
Therefore, 28.6% is present in unionised form.
For a system A (s) + B(g) 
C(l) + D(s). The number of phases are
A solution is made-up of 184.2g of ethanol and 108.1 g of H2O, if the volume of the solution is 333.4 cm3 and the partial molar volume of H2O, is 17 cm3. What is the partial molar volume of ethanol under these conditions?
The number of component for the reaction,
in vacuum is
C = N - r where, N = number of chemical constituted
N = 3
r = 2
Hence, C = 3-2 = 1
H2O ↔↔ H+ + OH-
These H+ from water contribute to total hydrogen ion concentration. Hence, the hydrogen ion concentration increases from 10-7 M and pH decreases from 7 as
[H+] = 2 × 10-7 M
pH = - log[H+] = 6.69
The pH of a solution made by adding 0.001 mole of NaOH to 100cm3 of a solution which is 0.50 M in CH3COOH and 0.50 M in CH3COONa is _________________ (pkCH3cooH = 4.744) (Round off to two decimal places).
The vapour pressure of solid and liquid chlorine is given by
where Psolid and p liquid are vapour pressure (in Torr) of solid and liquid chlorine near the triple point absolute temperature. The ratio of slope of solid-gas curve to the slope of liquid-gas curve at the trip the P-T diagram is ______(Round off to one decimal places).
At a certain temperature, kC = 0.11 for the reaction,
The equilibrium concentration of IC1 if 0.75 mole of I2 and 0.75 mol of CI2 are initially mixed in 2L flask is ___mol/L. (Round off to two decimal places).
kc = 0.11
For the reaction, 
Now, 
Initial concntration 
0
Equilibrium concentration 
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