Equilibria - Phase, Chemical & Ionic - GATE Chemistry MCQ

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?

For the below diagram, which statement is correct

A solution is 0.1M in CI^- and 0.001M in CrO^2-₄. If solid AgNO₃, is gradually added to this solution, the one which precipitate first is 

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).

Which of the following graph are correct?

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)

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 Z_A = 0.300 and X_A = 0.250. The mole fraction in vapour phase of Y_A is ____________(round off to two decimal places).

For the equilibrium,  is expressed as

The degree of freedom for a two component system, at congruent melting point is

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 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

The pH of 10^-7 HCI solution is 

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 _________________ (pk_CH3cooH = 4.744) (Round off to two decimal places).

The vapour pressure of solid and liquid chlorine is given by

where P_solid 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, k_C = 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).