IIT-JEE-Chemistry-Final Revision Set No.60

1. One mole of a non-ideal gas undergoes a change of state (2.0 atm. 3.0 L, 95 K ) → (4.0 atm. 5.0 L, 245 K) with a change in internal energy , DU = 30.0L atm. The change in enthalpy (ΔH) of the process in L atm is
(A) 40.0
(B) 42.0
(C) 44.0
(D) Not defined, because pressure is not constant

2. Specify the coordination geometry around and hybridization of N and B atoms in a 1:1 complex of BF3 and NH3
(A) N: tetrahedral , sp3 ; B: tetrahedral, sp3
(B) N: pyramidal, sp3 ; B: pyramidal, sp3
(C) N: pyramidal, sp3 ; B: planar, sp2
(D) N: pyramidal, sp3 ; B: tetrahedral, sp3


3. Consider the following equilibrium in a closed container

N2O4 (g) <--> 2NO2

At a fixed temperature, the volume of the reaction container is halved. For this change, which of the following holds true regarding the equilibrium constant (Kp) and degree of dissociation (α)?
(A) Neither KP nor α change
(B) Both KP and α change
(C) KP changes, but α does not change
(D) KP does not change, but α change


4. Identify a reagent from the following list which can easily distinguish between 1-butyne and 2-butyne
(A) Bromine, CCl4
(B) H2, Lindlar catalyst
(C) Dilute H2SO4, HgSO­4
(D) Ammoniacal CuCl2 solution

5. Which of the following acids has the smallest dissociation constant?
(A) CH3CHFCOOH
(B) FCH2CH2COOH
(C) BrCH2CH2COOH
(D) CH3CHBrCOOH