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The second law of thermodynamics: Spontaneity of processes, Delta S of the universe and Delta G of the system as criteria for spontaneity Mock Test for JEE

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Part of Chemical Thermodynamics in JEE Main Chemistry.

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Q1ChemistryUnit 4: Chemical Thermodynamics

Assertion The gas is heated, if its temperature is less than its inversion temperature in Joule-Thomson effect. Reason Heating effect in gas is noticed during Joule-Thomson effect when

\boldsymbol{T}>\boldsymbol{T}_{i}

Q2ChemistryUnit 4: Chemical Thermodynamics

Which of the following does not result in an increase in entropy?

Q3ChemistryUnit 4: Chemical Thermodynamics

All reactions involving chemical decomposition:

Q4ChemistryUnit 4: Chemical Thermodynamics

For a given reaction,

\boldsymbol{H}_{2} \boldsymbol{O}(l) \rightleftharpoons

H_{2} O(s) a t 0^{\circ} C

and 1 bar, which of the following is true?

Q5ChemistryUnit 4: Chemical Thermodynamics

Assertion Adsorption is exothermic and spontaneous inspite of the fact that adsorption is accompained with decrease in entropy. Reason The factor

T \Delta S

is lesser than

\Delta H

Q6ChemistryUnit 4: Chemical Thermodynamics

Fill in the blanks by putting appropriate choices.During adsorption there is

_{-}-

-in enthalpy and in the entropy of a system but adsorption is a spontaneous process and thus AG must be

\quad

Rate of physisorption with increase in pressure.

Q7ChemistryUnit 4: Chemical Thermodynamics

For the reaction,

\boldsymbol{X}_{2} \boldsymbol{O}_{4}(l) \longrightarrow

\mathbf{2} \boldsymbol{X} \boldsymbol{O}_{2}(\boldsymbol{g})

\Delta U=2.1 k c a l, \Delta S=20 \operatorname{cal} K^{-1} \mathrm{at}

300 \mathrm{K}

Hence

, \Delta G

Q8ChemistryUnit 4: Chemical Thermodynamics

For the reaction at

25^{\circ} C, X_{2} O_{4(l)} \longrightarrow

\mathbf{2} \boldsymbol{X} \boldsymbol{O}_{\mathbf{2}(\boldsymbol{g})}

\Delta H=2.1 k c a l

and

\Delta S=20 c a l \quad K^{-1}

The reaction would be:

Q9ChemistryUnit 4: Chemical Thermodynamics

Amount of usable energy available for work at uniform temperature and pressure is

Q10ChemistryUnit 4: Chemical Thermodynamics

Choose the correct option of temperature at which carbon reduces Fe0 to iron and produces CO.

Q11ChemistryUnit 4: Chemical Thermodynamics

toppr Q Type your question.

\boldsymbol{H}_{2} \boldsymbol{O}_{2(l)} \rightarrow \boldsymbol{H}_{2} \boldsymbol{O}_{(l)}+\frac{1}{2} \boldsymbol{O}_{2(g)} ; \boldsymbol{\Delta}_{r} \boldsymbol{G}^{o}=

-122.6 k J / m o l

As the reaction from left to right is accompanied by a decrease in free energy, it is a spontaneous process. However, its decomposition at

25^{\circ} \mathrm{C}

in the absence of catalysts is slow. The catalysts which accelerate decomposition are

\mathrm{Pt},

Ag, cobalt, iron, copper, manganese dioxide and light. Concentrated

\boldsymbol{H}_{2} \boldsymbol{O}_{2}

solution can result into uncontrolled decompositions leading to explosion.

\boldsymbol{H}_{2} \boldsymbol{O}_{2}

thus stored in colored wax-lined bottles (as rough glass surfaces) also causes its decomposition. A few stabilizers such as acids acetanilide, pyrophosphates, and stannates are added to slow down the decomposition of

\boldsymbol{H}_{2} \boldsymbol{O}_{2}

H_{2} O_{2}

is stored in colored wax-lined bottles because:

Q12ChemistryUnit 4: Chemical Thermodynamics

For an exothermic reaction to be sponteneous:

Q13ChemistryUnit 4: Chemical Thermodynamics

At temperature

1000^{\circ} \mathrm{C}, \Delta G

of the reaction

Z n O+C \rightarrow Z n+C O

is Temperature

Q14ChemistryUnit 4: Chemical Thermodynamics

Which of the following does not result in an increase in entropy?

Q15ChemistryUnit 4: Chemical Thermodynamics

During adsorption, enthalpy and entropy of the system are but

\Delta G

must be

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