JEE Revision Plan - Chemistry 6.2 for JEE & BITSAT Exams

Question 1

The standard enthalpy of formation

for methane, CH₄ is ‒74.9 kJ mol^‒1. In order to calculate the average energy given out in the formation of a C ‒ H bond from this it is necessary to know which one of the following?

Question 2

The heat of atomization of methane and ethane are 360 kJ/mol and 620 kJ/mol, respectively. The longest wavelength of light capable of breaking the C - C bond is (Avogadro number=6.02×10²³, h=6.62×10^-34J s):

Question 3

The heats of combustion of carbon and carbon monoxide are –393.5 and –283.5 kJ mol^-1, respectively. The heat of formation (in kJ) of carbon monoxide per mole is

Question 4

The energy required to break one mole of Cl — Cl bonds in Cl₂ is 242 kJ mol^–1. The longest wavelength of light capable of breaking a single Cl — Cl bond is (c = 3 ×10^–8 ms^–1 and N_A = 6.02 × 10²³ mol^–1)

Question 5

An ideal gas undergoes isothermal expansion at constant pressure. During the process:

Question 6

The equation of state for one mole of a gas is PV=RT + BP where B is a constant independent of temperature. The internal energy of fixed amount of gas is function of temperature only. If one mole of the above gas is isothermally expanded from 12L to 22L at a constant pressure of 1 bar at 400K, then the change in enthalpy of the gas is approx (B=2L/mol)

Question 7

At very low temperature the heat capacity of crystals is equal to C=aT³ where a is a constant. Find the entropy as a function of temperature in this temperature interval

Question 8

Select the correct statement:

Question 9

Which of the following statement(s) is/are true?

Question 10

At 5 × 10⁵ bar pressure density of diamond and graphite are 3g/cc and 2g/cc respectively, at certain temperature ‘T’. Find the value of ∆U – ∆H for the conversion of 1 mole of graphite to 1 mole of diamond at temperature ‘T’:

Question 11

Select correct statement(s) for the reaction H₂O(g)+CO(g)→H₂(g)+CO₂(g)

Question 12

Given the wave function of an orbital of hydrogen atom Ψ_1.0=(1/πa₀^3/2)e^-r/a0 , the most probable distance of the electron present in the given orbital from the nucleus is

Question 13

The below configuration is not correct as it violates

Question 14

The maximum probability of finding electron in the d_xy orbital is -

Question 15

Excited hydrogen atom emits light in the ultraviolet region at 2.47 × 10¹⁵ Hz. With this frequency, the energy of a single photon is: