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JEE Main Chemistry Thermodynamics Practice Questions

Question 1.

Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R)

Assertion (A) : Enthalpy of neutralisation of strong monobasic acid with strong monoacidic base is always $- 57 kJ {mol}^{- 1}$

Reason (R) : Enthalpy of neutralisation is the amount of heat liberated when one mole of $H^{+}$ ions furnished by acid combine with one mole of $^{-} OH$ ions furnished by base to form one mole of water.

In the light of the above statements, choose the correct answer from the options given below.

(A) is true but (R) is false

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are true but (R) is not the correct explanation of (A)

(A) is false but (R) is true

Question 2.

Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following :

q = 0, Δ T = 0, w = 0

q = 0, Δ T \neq 0, w = 0

q \neq 0, Δ T = 0, w = 0

q = 0, Δ T < 0, w \neq 0

Question 3.

Which of the following is not correct?

Δ G

is positive for a spontaneous reaction

Δ G

is positive for a non-spontaneous reaction

Δ G

is zero for a reversible reaction

Δ G

is negative for a spontaneous reaction

Question 4.

What happens when methane undergoes combustion in systems A and B respectively?

JEE Main 2023 (Online) 13th April Evening Shift Chemistry - Thermodynamics Question 34 English

System A	System B
Temperature falls	Temperature rises

System A	System B
Temperature rises	Temperature remains same

System A	System B
Temperature falls	Temperature remains same

System A	System B
Temperature remains same	Temperature rises

Question 5.

Given

(A)	$2 CO (g) + O_{2} (g) \to 2 {CO}_{2} (g)$		$Δ H_{1}^{0} = - x kJ {mol}^{- 1}$
(B)	$C (graphite) + O_{2} (g) \to {CO}_{2} (g)$		$Δ H_{2}^{0} = - y kJ {mol}^{- 1}$

$Δ H^{0}$ for the reaction

$C (graphite) + \frac{1}{2} O_{2} (g) \to CO (g)$ is :

\frac{x - 2 y}{2}

\frac{x + 2 y}{2}

2 y - x

\frac{2 x - y}{2}

Question 6.

Which of the following relations are correct?

(A) $Δ U = q + p Δ V$

(B) $Δ G = Δ H - T Δ S$

(D) $Δ H = Δ U - Δ nRT$

Choose the most appropriate answer from the options given below :

A and B only

B and C only

C and D only

B and D only

Question 7.

Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$

Assertion A : The reduction of a metal oxide is easier if the metal formed is in liquid state than solid state.

Reason $R$ : The value of $Δ G^{Θ}$ becomes more on negative side as entropy is higher in liquid state than solid state.

In the light of the above statements, choose the most appropriate answer from the options given below

Both A and R are correct and R is the correct explanation of A

Both A and R are correct but R is NOT the correct explanation of A

A is correct but R is not correct

A is not correct but R is correct

Question 8.

Which of the following relation is not correct?

Δ H = Δ U - P Δ V

Δ U = q + W

Δ S_{sys} + Δ S_{surr} ⩾ 0

Δ G = Δ H - T Δ S

Question 9.

$Δ$ G $^{\circ}$ vs T plot for the formation of MgO, involving reaction

2Mg + O₂ $\to$ 2MgO, will look like :

JEE Main 2022 (Online) 30th June Morning Shift Chemistry - Thermodynamics Question 59 English Option 1

JEE Main 2022 (Online) 30th June Morning Shift Chemistry - Thermodynamics Question 59 English Option 2

JEE Main 2022 (Online) 30th June Morning Shift Chemistry - Thermodynamics Question 59 English Option 3

JEE Main 2022 (Online) 30th June Morning Shift Chemistry - Thermodynamics Question 59 English Option 4

Question 10.

Match List-I with List-II.

	List - I		List - II
(A)	Spontaneous process	(I)	$Δ H < 0$
(B)	Process with $Δ P = 0$ , $Δ T = 0$	(II)	$Δ G_{T, P} < 0$
(C)	$Δ H_{r e a c t i o n}$	(III)	Isothermal and isobaric process
(D)	Exothermic Process	(IV)	[Bond energies of molecules in reactants] $-$ [Bond energies of product molecules

Choose the correct answer from the options given below :

(A) - (III), (B) - (II), (C) - (IV), (D) - (I)

(A) - (II), (B) - (III), (C) - (IV), (D) - (I)

(A) - (II), (B) - (III), (C) - (I), (D) - (IV)

(A) - (II), (B) - (I), (C) - (III), (D) - (IV)

Question 1.

At 25 $^{\circ}$ C and 1 atm pressure, the enthalpy of combustion of benzene (I) and acetylene (g) are $-$ 3268 kJ mol^{$-$ 1} and $-$ 1300 kJ mol^{$-$ 1}, respectively. The change in enthalpy for the reaction 3 C₂H₂(g) $\to$ C₆H₆ (I), is :

+324 kJ mol^{$-$ 1}

+632 kJ mol^{$-$ 1}

-

632 kJ mol^{$-$ 1}

-

732 kJ mol^{$-$ 1}

Question 2.

At 25 $^{\circ}$ C and 1 atm pressure, the enthalpies of combustion are as given below :

Substance	$H_{2}$	C (graphite)	$C_{2} H_{6} (g)$
$\frac{Δ_{c} H^{Θ}}{k J m o l^{- 1}}$	$- 286.0$	$- 394.0$	$- 1560.0$

The enthalpy of formation of ethane is

+54.0 kJ mol^{$-$ 1}

-

68.0 kJ mol^{$-$ 1}

-

86.0 kJ mol^{$-$ 1}

+97.0 kJ mol^{$-$ 1}

Question 3.

The incorrect expression among the following is :

\frac{Δ G_{S y s t e m}}{Δ S_{T o t a l}} = - T

(at constant P)

K = \frac{Δ H^{\circ} - T Δ S^{\circ}}{R T}

K = e^{- Δ G^{\circ} / R T}

For isothermal process

w_{r e v e r s i b l e} = - n R T \ln \frac{V_{f}}{V_{i}}

Question 4.

During which of the following processes, does entropy decrease?

(A) Freezing of water to ice at 0

^{\circ}

C

(B) Freezing of water to ice at

-

^{\circ}

C

(C) N₂(g) + 3H₂(g)

\to

2NH₃(g)

(D) Adsorption of CO(g) on lead surface.

(E) Dissolution of NaCl in water

Choose the correct answer from the options given below :

(A), (C) and (E) only

(B) and (C) only

(A), (B), (C) and (D) only

(A) and (E) only

Question 5.

For a reaction,
4M(s) + nO₂(g)

\to

2M₂O_n(s)
the free energy change is plotted as a functionof temperature. The temperature below whichthe oxide is stable could be inferred from theplot as the point at which :

the free energy change shows a changefrom negative to positive value

the slope changes from positive to negative

the slope changes from negative to positive

the slope changes from positive to zero

Question 6.

Lattice enthalpy and enthalpy of solution of NaCl are 788 kJ mol^–1, and 4 kJ mol^–1, respectively.
The hydration enthalpy of NaCl is :

–780 kJ mol^–1

–784 kJ mol^–1

780 kJ mol^–1

784 kJ mol^–1

Question 7.

Five moles of an ideal gas at 1 bar and 298 Kis expanded into vacuum to double the volume.The work done is :

Zero

-RT

\ln \frac{V_{2}}{V_{1}}

C_V (T₂ – T₁)

– RT (V₂ – V₁)

Question 8.

The process that is NOT endothermic in natureis :

Ar(g) + e^-

\to

Ar^-(g)

H(g) + e^-

\to

H^-(g)

Na(g)

\to

Na⁺(g) + e^-

O^-(g) + e^-

\to

O^2-(g)

Question 9.

For one mole of an ideal gas, which of thesestatements must be true?
(a) U and H each depends only on temperature
(b) Compressibility factor z is not equal to 1
(c) C_{P, m} – C_{V, m} = R
(d) dU = C_VdT for any process

(a), (c) and (d)

(a) and (c)

(b), (c) and (d)

Question 10.

The true statement amongst the following is :

S is a function of temperature but

Δ

S is nota function of temperature.

Both S and

Δ

S are not functions oftemperature.

Both

Δ

S and S are functions of temperature.

S is not a function of temperature but

Δ

S isa function of temperature.

JEE Main Thermodynamics Practice Questions With Solutions

JEE Main Chemistry Thermodynamics Practice Questions

Question 1.

Question 2.

Question 3.

Question 4.

Question 5.

Question 6.

Question 7.

Question 8.

Question 9.

Question 10.

Question 1.

Question 2.

Question 3.

Question 4.

Question 5.

Question 6.

Question 7.

Question 8.

Question 9.

Question 10.

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