HARD
Chemistry
IMPORTANT
Earn 100

The average Xe-F bond energy is 34 kcal/mol, first I.E. of Xe is 279 kcal/mol, electron affinity of F is 85 kcal/mol and bond dissociation energy of F2 is 38 kcal/mol. Then, the enthalpy change for the reaction

XeF4Xe++F-+F2+F will be

50% studentsanswered this correctly

Important Questions on Thermodynamics

HARD
Chemistry
IMPORTANT
The potential of the Daniell cell, ZnZnSO41 MCuSO41 MCu was reported by Buckbee, Surdzial and Metz as E°=1.1028-0.641×10-3T+0.72×10-5T2, where, T is the temperature in degree celsius. Calculate ΔS° for the cell reaction at 25°C:
EASY
Chemistry
IMPORTANT
Heat of reaction depend upon:
MEDIUM
Chemistry
IMPORTANT
For which of the following processes/reactions both enthalpy change as well as entropy change have +ve values?
EASY
Chemistry
IMPORTANT
One mole of O2g, initially at a temperature of 120 K and under a pressure of 4 atm is expanded adiabatically to 1 atm in such a way that the temperature of the gas falls to 90 K (just above its normal boiling point). Cp of O2g is 28.2JK-1 mol-1 and is constant over the required temperature range. O2g is supposed to behave ideally. Choose the correct options : log2=0.3010, log3=0.4771
MEDIUM
Chemistry
IMPORTANT
An ideal gas in thermally insulated container, at internal pressure P1, volume V1 and absolute temperature T1 expands irreversibly against zero external pressure so that the pressure of gas becomes P2, volume V2 and temperature T2. Which of the following statement(s) is/are correct ?

Question Image 

MEDIUM
Chemistry
IMPORTANT
A normal boiling point of a liquid is 350K and ΔHvap is 35kJ mol-1. Assume that ΔHvap is independent from temperature and pressure. The correct statement (s) is/are
HARD
Chemistry
IMPORTANT

Select the correct statement for the equilibrium under standard conditions:

H2OsH2Ol; ΔS1

H2OlH2Og; ΔS2o

H2OsH2Og; ΔS3o

HARD
Chemistry
IMPORTANT

For an ideal gas, consider only P-V work in going from an initial state X to the final state Z. The final state Z can be reached by either of the two paths shown in the figure. Which of the following choice(s) is(are) correct? [Take ΔS as change in entropy and w as work done.]

Question Image