Chemistry · JEE

Enthalpies of bond dissociation, combustion, formation, atomization, sublimation, phase transition, hydration, ionization and solution Mock Test for JEE

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Syllabus context

Part of Chemical Thermodynamics in JEE Main Chemistry.

Free sample questions

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Q1ChemistryUnit 4: Chemical Thermodynamics

Which is a common standard for calibrating a bomb calorimeter in teaching laboratories?

Q2ChemistryUnit 4: Chemical Thermodynamics

\boldsymbol{C}_{\boldsymbol{g} \text {raphite}}+\boldsymbol{O}_{\mathbf{2}(\boldsymbol{g})} \rightarrow \boldsymbol{C} \boldsymbol{O}_{2(\boldsymbol{g})} ; \boldsymbol{\Delta} \boldsymbol{H}=

-393.5 k J, \Delta H

of the reaction cannot be:

Q3ChemistryUnit 4: Chemical Thermodynamics

If enthalpies of formation for

\boldsymbol{C}_{2} \boldsymbol{H}_{4}(\boldsymbol{g})

C O_{2}(g)

and

H_{2} O(l)

25^{\circ} \mathrm{C}

and 1 atm pressure be 52,-394 and -286

k J

mol

^{-1}

respectively, then the enthalpy of combustion of

C_{2} H_{4}(g)

will be:

Q4ChemistryUnit 4: Chemical Thermodynamics

When a solid is converted into a gas, directly by heating then this process is known as:

Q5ChemistryUnit 4: Chemical Thermodynamics

The compound with negative value of heat of formation is called:

Q6ChemistryUnit 4: Chemical Thermodynamics

Which among the following has the highest calorific value?

Q7ChemistryUnit 4: Chemical Thermodynamics

When fuel is added to the exhaust (burnt) gases in a jet engine combustion takes place. Some facts are mentioned here about this combustion. Pick the false one?

Q8ChemistryUnit 4: Chemical Thermodynamics

Which of the following equations corresponds to the definition of enthalpy of formation at

298 K ?

Q9ChemistryUnit 4: Chemical Thermodynamics

For the reaction

N_{2}+3 X_{2} \rightarrow 2 N X_{3}

where

\boldsymbol{X}=\boldsymbol{F}, \boldsymbol{C l}

(the average bond energies are

\boldsymbol{F}-\boldsymbol{F}=\mathbf{1 5 5} \boldsymbol{k} \boldsymbol{J} \boldsymbol{m o l}^{-1}

N-F=272 k J m o l^{-1}, C l-C l=

242 k J m o l^{-1}, N-C l=

200 k J m o l^{-1}

and

N \equiv N=

941 k J

mol

^{-1}

). The heats of formation of

N F_{3}

and

N C l_{3}

k J m o l^{-1}

respectively, are closest to:

Q10ChemistryUnit 4: Chemical Thermodynamics

When water is added to

H_{2} S O_{4},

the reaction is exothermic. It is because of formation of:

Q11ChemistryUnit 4: Chemical Thermodynamics

Density of water in the solid state is.............. than the density of water in the liquid state

Q12ChemistryUnit 4: Chemical Thermodynamics

Calculate the energy required to excite two litre of hydrogen gas at 1 atom and

298 \mathrm{k}

to the first excited state of atomic hydrogen. The energy for the disassociation of

\mathrm{H}_{2}

bond is

436 \mathrm{kJ}

mol

-1 .

Also calculate the minimum frequency of photon to break this bond.

Q13ChemistryUnit 4: Chemical Thermodynamics

The heat of neutralization of HCl by NaOH is

-55.9 \mathrm{kJ} / \mathrm{mol}

. If the heat of neutralization of HCN by NaOH is -12.1 kJ/ mol. The energy of dissociation of HCN is :

Q14ChemistryUnit 4: Chemical Thermodynamics

The decreasing order of bond dissociation energies of

\boldsymbol{C}-\boldsymbol{C}, \boldsymbol{C}-\boldsymbol{H}

and

H-H

bonds is:

Q15ChemistryUnit 4: Chemical Thermodynamics

The enthalpy of

S-S

bond from the following data is:

(\text { i }) C_{2} H_{5}-S-C_{2} H_{5}(g) ; \Delta_{f} H^{o}=

-147.2 \mathrm{kJ} / \mathrm{mol}

(\text { ii }) C_{2} H_{5}-S-S-

\boldsymbol{C}_{2} \boldsymbol{H}_{5}(\boldsymbol{g}) ; \boldsymbol{\Delta}_{f} \boldsymbol{H}^{o}=-\mathbf{2 0 1 . 9} \mathrm{kJ} / \mathrm{mol}

(\text { iii }) S(g) ; \Delta_{f} H^{o}=-222.8 \mathrm{kJ} / \mathrm{mol}

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